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submitted by psncodes4free to XPLOITS [link] [comments]

NanoFusion - Project Update and Next Steps

Build-Off Result

I'm sure some people will be wondering about the status of the NanoFusion project going forward. Naturally, the outcome of the Nano Build-Off was pretty disappointing for me personally. After initially receiving such a wave of positive feedback here on reddit, it was unfortunate to not even crack the top 20 projects.
In spite of that result, I think the community's desire to see a trustless privacy protocol in the Nano ecosystem is actually quite strong. I believe this Build-Off result is primarily a reflection of the judging criteria, which skewed strongly towards apps that were already somewhat polished, and able to be tested by one person within the space of 10 minutes. This naturally disfavours a project like NanoFusion which is still a proof-of-concept, and requires multiple participants in order to properly use it. All that to say, while I applaud the winning projects for their efforts, and extend my gratitude to Nanillionaire for sponsoring the event, I don't believe that the Build-Off result gives a full picture of the community's true priorities for future development of the Nano ecosystem.
Nevertheless this result points to a stark reality: NanoFusion is not yet ready for consumer use, not by a long shot.

What will it take for NanoFusion to be consumer-ready?

Protocol and Reference Implementation Status
There is a small amount of work to be done to finish the reference implementation of the protocol. The binary tree of input mix accounts has been constructed, but the code is not yet written to actually execute the mix, nor to trigger and execute refunds where necessary. That is really the last step that needs to be completed for the reference implementation, and it's not especially complicated. The tricky bit is that there are still a few bugs around communication between the clients that need ironing out. But those are relatively minor bugs, I'm confident they won't require fundamental changes to the protocol or the implementation architecture.
However, once the reference implementation is complete, that is where a whole new set of challenges begins.
Wallet Integration
The primary challenge will be to integrate NanoFusion into one or more popular wallets. For a privacy protocol to be most effective, we need as many people as possible using it. In a cryptocurrency like Nano, where transactions and addresses are all publicly visible on a block explorer, privacy is achieved by making it difficult to determine which transactions belong to you. Making it difficult is a matter of having your transactions get "lost in the crowd". The crowd of transactions that might potentially be yours is called the "anonymity set". We need that anonymity set to be as large as possible, which means we need as many people participating in Fusion events as possible.
The best way to achieve this is to get NanoFusion adopted by popular wallets, and ideally to have it enabled by default. The less decisions that a user needs to make in order to start participating, the better.
This raises one very important question. How do we make it as easy and appealing as possible for the developers of popular wallets to integrate this technology?
Workflow Design
In order to make NanoFusion integration appealing to wallet developers, I believe we need to gear NanoFusion integration around workflows that actually work for end-users of the wallet. This is not as simple as it appears.
The Nano ecosystem is currently geared around the assumption that addresses will tend to be re-used for many sends and receives. This is almost intrinsic to the ORV consensus mechanism. You keep your funds in one account, and the voting weight for that account is assigned to your representative.
In a UTXO-based cryptocurrency, BCH in particular, it is much more normal to use a separate subaddress for every incoming transaction. CashFusion on BCH works by taking all your different receive addresses and mixing the funds from those addresses together (along with the funds of many other people's subaddress sets). But on Nano it's different. Imagine you have an online store accepting Nano funds via BrainBlocks integration. If you receive 100 payments, you might have BrainBlocks forward them all to just one account that you own. But this makes it trivial for a customer to look at the block explorer and see all of your sales volume, which completely undermines your privacy.
In the context of something like BrainBlocks, it's easy to see how our e-commerce store could generate a new address for each transaction, and have BrainBlocks forward funds to that new address. Then we could run NanoFusion later to obscure the linkages between our individual sales. But what about addresses that are shared in public? Lots of people put up single Nano addresses to receive donations, etc. What does NanoFusion do with those? For NanoFusion to be most effective, a given user should NOT have just one input and one output account in the mix. It makes it too easy for their input and output accounts to be linked (at least to a moderate-to-high degree of probability) by the publicly visible amounts in the accounts.
For NanoFusion to be most effective, we need to develop a culture where it is normal for people to use a new address each time they receive some nano. How do we make it appealing for wallet developers to build their wallets this way? I don't really know. The only example of this pattern that I know is Nanonymous (https://github.com/LilleJohs/Nanonymous). We could potentially implement something like stealth addresses, so that the user really gives out one canonical public address, but a different receive address is actually used for each transaction "under the hood". However, that adds a whole new layer of complexity. It means wallets have to be upgraded to know how to interact with a stealth address.
API Design
Even if we could arrange things so that it was more common for individuals to have multiple input accounts to mix, we would still be left with another question. What would wallet developers want the API for NanoFusion to look like? By nature, NanoFusion requires a large number of messages to be sent back and forth between all of the mix participants. For security reasons, those messages cannot be sent all at once. Player A has to wait for Player B to send message 1 before it is safe (cryptographically) for Player A to reveal the content of message 2.
What should a library look like that manages that complexity on behalf of the wallet developer? What language should it be written in? I have begun this project under the assumption that the most common wallet-dev language would be javascript, but there may be cases where other platforms are needed.

Where To From Here?

Technical Reflections
Thinking through all of these practical challenges has given me a new perspective on the whole issue of cryptocurrency privacy protocols. I have a much greater respect for what has been achieved by the Monero project. In Monero, everyone actually uses the privacy protocol. As described above, that is no small accomplishment. Even though the privacy protocols for Dash, ZCash, BTC and BCH do basically work, their use is not widespread. Even leaving aside the issue of the extra transaction fees incurred (which is not such a problem for Nano), these optional privacy protocols are just not that convenient to use. Because not everyone uses them, the anonymity set is not nearly as large as it could be. And because not everyone uses them, transactions you do before and after a mix/fusion event leak metadata which can be used to undermine the privacy that you gained by using the privacy protocol in the first place.
Inevitably, NanoFusion will also suffer from this problem. Suppose that 20% of the Nano community starts regularly participating in fusions (a very generous estimate, given the low adoption rate of optional privacy features in the other cryptocurrencies mentioned). That still leaves the large majority of transactions probably re-using addresses most of the time. This means that the non-private majority will leak fresh metadata whenever they interact with accounts that were previously obscured through NanoFusion. This is not an easy problem to overcome. It can only be done with a culture shift towards ubiquitous privacy, and that can probably only be achieved by all major wallets agreeing to enable privacy features by default. Not an easy hill to climb.
Personal Circumstances
For the sake of transparency, I also want to mention that I will be stepping back from NanoFusion for a while. This is simply a necessity of life. Our first child will be born in a few months. Once that happens, I will obviously have a lot going on and much less time available to work on these kinds of side projects. Between now and then, I need to focus on other projects which have more potential to generate some income for my little family. I'm a dad now(!), and my family comes first.
I'm very glad to have (hopefully) contributed some useful groundwork for the process of bringing privacy to Nano. This project also gave me the chance to learn some new technologies at a much deeper level, I'm grateful that too. Neverthless, for the foreseeable future, I'll be stepping back. I don't make that decision lightly. I put a lot of blood, sweat and tears into bringing NanoFusion this far, so I definitely hope it doesn't just fall by the wayside. I hope others will pick it up and run with it in my absence.
Call to Action
Want to make NanoFusion happen? Here's what we really need next:
  1. Wallet Developers - we need you to speak up. Tell us, what would an ideal NanoFusion API look like? How can we make it as easy as possible for you to integrate NanoFusion into your wallet app? What programming language do you want to use to consume that API? What I would love to see is several wallet developers collaborating together to create a document describing their ideal API. That will make it much easier for potential developers to pick it up and start implementing it.
  2. Javascript developers - are any of you interested in stepping up and finishing off the last bits of the reference implementation for NanoFusion?
As always, details of the project are available at http://nanofusion.casa (including demo videos, technical whitepaper and the link to the GitHub repo).
God bless everyone, thank you to all those who have followed along and offered so much encouragement for this project.
submitted by fatalglory to nanocurrency [link] [comments]

MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

submitted by cuavas to emulation [link] [comments]

MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

submitted by cuavas to MAME [link] [comments]

Invisible Object Culling In Quake Related Engines (REVISED)

Prologue
Despite all these great achievements in video cards development and the sworn assurances of developers about drawing 2 to 3 million polygons on screen without a significant FPS drop, it’s not all that rosy in reality. It depends on methods of rendering, on the number of involved textures and on the complexity and number of involved shaders. So even if all this really does ultimately lead to high performance, it only happens in the demos that developerss themselves kindly offer. In these demos, some "spherical dragons in vacuum" made of a good hundred thousand polygons are drawn very quickly indeed. However, the real ingame situation for some reason never looks like this funny dragon from a demo, and as a result many comrades abandon the development of their "Crysis killer" as soon as they can render a single room with a couple of light sources, because for some reason FPS in this room fluctuate around 40-60 even on their 8800GTS and upon creating second room it drops to a whopping 20. Of course with problems like this, it would be incorrect to say how things aren’t that bad and how the trouble of such developers are purely in their absence of correctly implemented culling, and how it is time for them to read this article. But for those who have already overcome “the first room syndrome" and tried to draw – inferior though, but, anyway - the world, this problem really is relevant.
However, it should be borne in mind that QUAKE, written in ancient times, was designed for levels of a “corridor" kind exclusively; therefore methods of clipping discussed in this article are not applicable to landscapes, such as ones from STALKER or Crysis, since completely different methods work there, whose analysis is beyond the scope of this article. Meanwhile we’ll talk about the classic corridor approach to mapping and the effective clipping of invisible surfaces, as well as clipping of entire objects.

The paper tree of baloon leaves

As you probably know, QUAKE uses BSP, Binary Spacing Partition tree. This is a space indexing algorithm, and BSP itself doesn’t care if the space is open or closed, it doesn’t even care if the map is sealed, it can be anything. BSP implies the division of a three-dimensional object into a certain number of secant planes called "the branches" or "the nodes" and volumetric areas or rooms called "the leaves". The names are confusing as you can see. In QUAKE / QUAKE2 the branches usually contain information about the surfaces that this branch contain, and the leaves are an empty space, not filled with nothing. Although sometimes leaves may contain water for example (in a form of a variable that indicates, specifically, that we’ve got water in this leaf). Also, the leaf contains a pointer to the data of potential visibility (Potentially Visible Set, PVS) and a list of all surfaces that are marked as being visible from this leaf. Actually the approach itself implies that we are able to draw our world however we prefer, either using leaves only or using branches only. This is especially noticeable in different versions of QUAKE: for example, in QUAKE1 in a leaf we just mark our surfaces as visible and then we also sequentially go through all the surfaces visible from a particular branch, assembling chains of surfaces to draw them later. But in QUAKE3, we can accumulate visible surfaces no sooner than we’ll get into the leaf itself.
In QUAKE and QUAKE2, all surfaces must lie on the node, which is why the BSP tree grows rather quickly, but in exchange this makes it possible to trace these surfaces by simply moving around the tree, not wasting time to check each surface separately, which affects the speed of the tracer positively. Because of this, unique surface is linked to each node (the original surface is divided into several if necessary) so in the nodes we always have what is known to be visible beforehand, and therefore we can perform a recursive search on the tree using the BBox pyramid of frustum as a direction of our movement along the BSP tree (SV_RecursiveWorldNode function).
In QUAKE3, the tree was simplified and it tries to avoid geometry cuts as much as possible (a BSP tree is not even obliged to cut geometry, such cuts are but a matter of optimality of such a tree). And surfaces in QUAKE3 do not lie on the node because patches and triangle models lie there instead. But what happens would they be put on the node nevertheless, you can see on the example of "The Edge Of Forever" map that I compiled recently for an experimental version of Xash. Turns out, in places that had a couple thousand visible nodes and leaves in the original, there are almost 170 thousand of them with a new tree. And this is the result after all the preliminary optimizations, otherwise it could have been even more, he-he. Yeah, so... For this reason, the tree in QUAKE3 does not put anything on the node and we certainly do need to get into the leaf, mark visible surfaces in it and add them to the rendering list. On the contrary, in QUAKE / QUAKE2 going deep down to the leaf itself is not necessary.
Invisible polygon cutoff (we are talking about world polys, separate game objects will be discussed a bit later) is based on two methods:
The first method is to use bit-vectors of visibility (so-called PVS - Potential Visible Set). The second method is regular frustum culling which actually got nothing to do with BSP but works just as efficiently, for a certain number of conditions of course. Bottom line: together these two methods provide almost perfect clipping of invisible polygons, drawing a very small visible piece out of the vast world. Let's take a closer look at PVS and how it works.

When FIDO users get drunk

Underlying idea of PVS is to expose the fact that one leaf is visible from another. For BSP alone it’s basically impossible because leaves from completely different branches can be visible at the same time and you will never find a way to identify the pattern for leafs from different branches seeing each other - it simply doesn’t exist. Therefore, the compiler has to puff for us, manually checking the visibility of all leaves from all leaves. Information about visibility in this case is scanty: one Boolean variable with possible values 0 and 1. 0 means that leaf is not visible and 1 means that leaf is visible. It is easy to guess that for each leaf there is a unique set of such Boolean variables the size of the total number of leaves on the map. So a set like this but for all the leaves will take an order of magnitude more space: the number of leaves multiplied by the number of leaves and multiplied by the size of our variable in which we will store information of visibility (0 \ 1).
And the number of leaves, as you can easily guess, is determined by map size map and by the compiler, which upon reaching a certain map size, cease to divide the world into leaves and treat resulting node as a leaf. Leaf size vary for different QUAKE. For example, in QUAKE1 leaves are very small. For example I can tell you that the compiler divide standard boxmap in QUAKE1 into as many as four leaves meanwhile in QUAKE3 similar boxmap takes only one leaf. But we digress.
Let's estimate the size of our future PVS file. Suppose we have an average map and it has a couple thousand leaves. Would we imagine that the information about the leaf visibility is stored in a variable of char type (1 byte) then the size of visdata for this level would be, no more no less, almost 4 megabytes. That is, much AF. Of course an average modern developer would shrug and pack the final result into zip archive but back in 1995 end users had modest machines, their memory was low and therefore visdata was packed in “more different” ways. The first step in optimizing is about storing data not in bytes, but in bits. It is easy to guess that such approach reduce final result as much as 8 times and what's typical AF – does it without any resource-intensive algorithms like Huffman trees. Although in exchange, such approach somewhat worsened code usability and readability. Why am I writing this? Due to many developers’ lack of understanding for conditions in code like this:
if ( pvs [ leafnum >> 3 ] & ( 1 << ( leafnum & 7 ) ) ) { } 
Actually, this condition implement simple, beautiful and elegant access to the desired bit in the array (as one can recall, addressing less than one byte is impossible and you can only work with them via bit operations)

Titans that keep the globe spinning

The visible part of the world is cut off in the same fashion: we find the current leaf where the player is located (in QUAKE this is implemented by the Mod_PointInLeaf function) then we get a pointer to visdata for the current leaf (for our convenience, it is linked directly to the leaf in the form of "compressed_vis" pointer) and then stupidly go through all the leaves and branches of the map and check them for being visible from our leaf (this can be seen in the R_MarkLeaves function). As long as some leaves turn out to be visible from the current leaf we assign them a unique number from "r_visframecount" sequence which increases by one every frame. Thus, we emphasize that this leaf is visible when we build the current frame. In the next frame, "r_framecount" is incremented by one and all the leaves are considered invisible again. As one can understand, this is much more convenient and much faster than revisiting all the leaves at the end of each frame and zeroing their "visible" variable. I drew attention to this feature because this mechanism also bothers some and they don’t understand how it works.
The R_RecursiveWorldNode function “walk” along leaves and branches marked this way. It cuts off obviously invisible leaves and accumulate a list of surfaces from visible ones. Of course the first check is done for the equivalence of r_visframecount and visframe for the node in question. Then the branch undergoes frustum pyramid check and if this check fails then we don’t climb further along this branch. Having stumbled upon a leaf, we mark all its surfaces visible the same way, assigning the current r_framecount value to the visframe variable (in the future this will help us to determine quickly whether a certain surface is visible in the current frame). Then, using a simple function, we determine which side we are from the plane of our branch (each branch has its own plane, literally called “plane” in the code) and, again, for now, we just take all surfaces linked to this branch and add them to the drawing chain (so-called “texturechain”), although nobody can actually stop us from drawing them immediately, right there, (in QUAKE1 source code one can see both options) having previously checked these surfaces for clipping with the frustum pyramid, or at least having made sure that the surface faces us.
In QUAKE, each surface has a special flag SURF_PLANEBACK which help us determine the orientation of the surface. But in QUAKE3 there is no such flag anymore, and clipping of invisible surfaces is not as efficient, sending twice as many surfaces for rendering. However, their total number after performing all the checks is not that great. However, whatever one may say, adding this check to Xash3D raised average FPS almost one and half times in comparison to original Half-Life. This is on the matter whether it is beneficial. But we digress.
So after chaining and drawing visible surfaces, we call R_RecursiveWorldNode again but now - for the second of two root branches of BSP tree. Just in case. Because the visible surfaces, too, may well be there. When the recursion ends, the result will either be a whole rendered world, or chains of visible surfaces at least. This is what can actually be sent for rendering with OpenGL or Direct3D, well, if we did not draw our world right in the R_RecursiveWorldNode function of course. Actually this method with minor upgrades successfully used in all three QUAKEs.

A naked man is in a wardrobe because he's waiting for a tram

One of the upgrades is utilization of the so-called areaportals. This is another optimization method coming straight out of QUAKE2. The point of using areaportals is about game logic being able to turn the visibility of an entire sectors on and off at its discretion. Technically, this is achieved as follows: the world is divided into zones similar to the usual partitioning along the BSP tree, however, there can’t be more than 256 of them (later I will explain why) and they are not connected in any way.
Regular visibility is determined just like in QUAKE; however, by installing a special “func_areaportal” entity we can force the compiler to split an area in two. This mechanism operates on approximately the same principle as the algorithm of searching for holes in the map, so you won’t deceive the compiler by putting func_areaportal in a bare field - the compiler will simply ignore it. Although if you make areaportal the size of the cross-section of this field (to the skybox in all directions) in spite of everything the zones will be divided. We can observe this technique in Half-Life 2 where an attempt to return to old places (with cheats for example) shows us disconnected areaportals and a brief transition through the void from one zone to another. Actually, this mechanism helped Half-Life 2 simulate large spaces successfully and still use BSP level structure (I have already said that BSP, its visibility check algorithm to be precise, is not very suitable for open spaces).
So installed areaportal forcibly breaks one zone into two, and the rest of the zoneization is at the discretion of the compiler, which at the same time makes sure not to exceed 256 zones limit, so their sizes can be completely different. Well, I repeat, it depends on the overall size of the map. Our areaportal is connected to some door dividing these two zones. When the door is closed - it turns areaportal off and the zones are separated from each other. Therefore, if the player is not in the cut off zone, then rendering it is not worth it. In QUAKE, we’d have to do a bunch of checks and it’s possible that we could only cut off a fraction of the number of polygons (after all, the door itself is not an obstacle for either visibility check, or even more so, nor it is for frustum). Compare to case in point: one command is issued - and the whole room is excluded from visibility. “Not bad,” you’d say, “but how would the renderer find out? After all, we performed all our operations on the server and the client does not know anything about it.” And here we go back to the question why there can’t be more than 256 zones.
The point is, information about all of zone visibility is, likewise, packaged in bit flags (like PVS) and transmitted to the client in a network message. Dividing 256 bits by 8 makes 32 bytes, which generally isn’t that much. In addition, the tail of this information can be cut off at ease if it contains zeroes only. Though the payback for such an optimization would appear as an extra byte that will have to be transmitted over the network to indicate the actual size of the message about the visibility of our zones. But, in general, this approach justified.

Light_environment traces enter from the back

Source Engine turned out to have a terrible bug which makes the whole areaportal thing nearly meaningless. Numerous problems arise because of it: water breaks down into segments that pop in, well, you should be familiar with all this by now. Areaportal cuts the geometry unpredictably, like an ordinary secant plane, but its whole point is being predictable! Whereas areaportal brushes in Source Engine have absolutely no priority in splitting the map. It should be like this: first, the tree is cut the regular way. And when no suitable planes left, the final secant plane of areaportal is used. This is the only way to cut the sectors correctly.

Modern problems

The second optimization method, as I said, is increased size of the final leaf akin to QUAKE3. It is believed that a video card would draw a certain amount of polygons much faster than the CPU would check whether they are visible. This come from the very concept of visibility check: if visibility check takes longer than direct rendering, then well, to hell with this check. The controversy of this approach is determined by a wide range of video cards present at the hands of the end users, and it is strongly determined by the surging fashion for laptops and netbooks in which a video card is a very conditional and very weak concept (don’t even consider its claimed Shader Model 3 support). Therefore, for desktop gaming machines it would be more efficient to draw more at a time, but for weak video cards of laptops traditional culling will remain more reliable. Even if it is such a simple culling as I described earlier.

Decompression sickness simulator

Although I should also mention the principles of frustum culling, perhaps they are incomprehensible to some. Cutoff by frustum pyramid is actually pure mathematics without any compiler calculations. From the current direction of the player’s gaze, a clipping pyramid is built (the tip of the pyramid – in case someone can’t understand - is oriented towards the player’s point of view and its base is oriented in the direction of player’s view). The angle between the walls of the pyramid can be sharp or blunt - as you probably guessed already, it depends on the player's FOV. In addition, the player can forcefully pull the far wall of the pyramid closer to himself (yes, this is the notorious “MaxRange” parameter in the “worldspawn” menu of the map editor). Of course, OpenGL also builds a similar pyramid for its internal needs when it takes information from the projection matrix but we’re talking local pyramid now. The finished pyramid consists of 4-6 planes (QUAKE uses only 4 planes and trusts OpenGL to independently cut far and near polygons, but if you write your own renderer and intend to support mirrors and portals you will definitely need all six planes). Well, the frustum test itself is an elementary check for a presence of AA-box (AABB, Axis Aligned Bounding Box) in the frustum pyramid. Or speaking more correctly, this is a check for their intersection. Let me remind you that each branch has its own dimensions (a fragment of secant plane bound by neighboring perpendicular secant planes) which are checked for intersection. But unfortunately the frustum test has one fundamental drawback - it cannot cut what is directly in the player’s view. We can adjust the cutoff distance, we can even make that “ear feint” like they do in QFusion where final zFar value is calculated in each frame before rendering and then taken into account in entity clipping, but after all, whatever they say, the value itself was obtained from PVS-information. Therefore, neither of two methods can replace the other but they just complement each other. This should be remembered.

I gotta lay off the pills I'm taking

It seems that we figured out the rendering of the world and now we are moving on smoothly to cutting off moving objects... which are all the visible objects in the world! Even ones that, at te first glance, stand still and aren’t planning to move anywhere. Cause the player moves! From one point he still sees a certain static object, and from another point, of course, he no longer does. This detail should also be considered.
Actually, at the beginning of this article I already spoke in detail about an algorithm of objects’ visibility check: first we find the visible leaf for the player, then we find the visible leaf for the entity and then we check by visdata whether they see each other. I, too, would like to clarify (if someone suddenly does not understand) how each moving entity is given the number of its current visible leaf, i.e. directly for entity’s its own current position, and the leaves themselves are of course static and always in the same place.

Ostrich is such an OP problem solver

So the method described above has two potential problems:
The first problem is that even if A equals B, then, oddly enough, B is far from being always equal A. In other words, entity A can see entity B, but this does not mean that entity B see entity A, and, no, it’s not about one of them “looking” away. So why is this happening? Most often for two reasons:
The first reason is that one of the entities’ ORIGIN sit tight inside the wall and the Mod_PointInLeaf function for it points to the outer “zero” leaf from which EVERYTHING is visible (haven’t any of you ever flown around the map?). Meanwhile, no leaf inside the map can see outer leaf - these two features actually explain an interesting fact of an entire world geometry becoming visible and on the contrary, all objects disappearing when you fly outside the map. In regular mode, similar problems can occur for objects attached to the wall or recessed into the wall. For example, sometimes the sounds of a pressed button or opening door disappear because its current position went beyond the world borders. This phenomenon is fought by interchanging objects A and B or by obtaining alternative points for the position of an object, but all the same, it’s all not very reliable.

But lawyer said that you don't exist

In addition, as I said, there is another problem. It come from the fact that not every entity fits a single leaf. Only the player is so small that he can always be found in one leaf only (well, in the most extreme case - in two leaves on the border of water and air. This phenomenon is fought with various hacks btw), but some giant hentacle or on the contrary, an elevator made as a door entity, can easily occupy 30-40 leaves at a time. An attempt to check one leaf (for example, one where the center of the model is) will inevitably lead to a deplorable result: as soon as the center of an object will be out of the player’s visibility range, the entire object will disappear completely. The most common case is the notorious func_door used as an elevator. There is one in QUAKE on the E1M1. Observe: it travels halfway and then its ORIGIN is outside the map and therefore it must disappear from the player’s field of view. However, it does not go anywhere, right? Let us see in greater detail how this is done.
The simplest idea that comes to one’s mind: since the object occupies several leaves, we have to save them all somewhere in the structure of an object in the code and check them one by one. If at least one of these leaves is visible, then the whole object is visible (for example, it’s very tip). This is exactly what was implemented in QUAKE: a static array for 16 leaves and a simple recursive function SV_FindTouchedLeafs that looks for all the leaves in range hardcoded in "pev->absmins" and "pev->absmax" variables (pev i.e. a Pointer to EntVars_t table). absmins and absmax are recalculated each time SV_LinkEdict (or its more specific case of UTIL_SetOrigin) is called. Hence the quite logical conclusion that a simple change of ORIGIN without recalculating its visible leaf will take the object out of visibility sooner or later even if, surprisingly enough, it’s right in front of the player and the player should technically still be able to see it. Inb4 why one have to call UTIL_SetOrigin and wouldn’t it be easier to just assign new value to the "pev->origin" vector without calling this function. It wouldn’t.
With this method we can solve both former problems perfectly: we can fight the loss of visibility if the object's ORIGIN went beyond the world borders and level the difference of visibility for A->B versus visibility for B->A.

A secret life of monster_tripmine

Actually we’ve yet to encounter another problem, but it does not occur immediately. Remember, we’ve got an array of 16 leaves. But what if it won’t be enough? Thank God there are no beams in QUAKE and no very long elevators made as func_door either. For this exact reason. Because when the array is filled to capacity, the SV_FindTouchedLeafs function just stop and we can only hope that there won’t be that many cases when an object disappear right before our eyes. But in the original QUAKE, such cases may well be. In Half-Life, the situation is even worse - as you can remember there are rays that can reach for half the map, tripmine rays for example. In this case, a situation may occur when we see just the very tip of the ray. For most of these rays, 16 leaves are clearly not enough. Valve tried to remedy the situation by increasing the array to 48 leaves. That helped. On early maps. If you remember, at the very beginning of the game when the player has already got off the trailer, he enters that epic elevator that takes him down. The elevator is made as a door entity and it occupies 48 leaves exactly. Apparently, the final expansion of the array was based after its dimensions. Then the programmers realized that this isn’t really a solution, because no matter how much one would expand the array, it can still be lacking for something. So then they screwed up an alternative method for visibility check: a head branch (headnode) check. In short, this is still the same SV_FindTouchedLeafs but now it is called directly from the place of visibility check and with a subsequent transfer of visdata in there. In general, it is not used very often because it is slower than checking pre-accumulated leaves, that is, it is intended just for such non-standard cases like this one.
Well, and since, I hope, general picture of the clipping mechanism already beginning to take shape in your mind, I will finish the article in just a few words.
On the server, all objects that have already passed the visibility check are added to the network message containing information about visible objects. Thus, on the client, the list of visible entities is already cut off by PVS and we do not have to do this again and therefore a simple frustum check is enough. You ask, "why did we have to cut off invisible objects on the server when we could do this later when we are on the client already?" I reply: yes, we could, but now the objects cut off on the server didn’t get into the network message and saved us some traffic. And since the player still does not see them, what is the point of transferring them to the client just to check them for visibility after? This is a kind of double optimizing :)
© Uncle Mike 2012
submitted by crystallize1 to hammer [link] [comments]

I MADE 36K PROFIT IN A DEMO ACCOUNT...

Hello fellas, I started trading around 4 months ago, i installed the iq option and started trading with a demo account (you start with 10k) , first days i was losing (i lost all 10k), and then from gathering informations and sticking to a plan with a disciplined mind, i flipped the script and made 36k profit. It made me think since it's a demo account maybe it's just a way to motivate you and deposit money, so that's really my question.. Is it like a "scam" or is it real (keep in mind in mind i trade stocks not binary option or whatever)
submitted by Twy37 to Daytrading [link] [comments]

Wine 5.6 Released

The Wine development release 5.6 is now available.
 
https://www.winehq.org/announce/5.6 
 
What's new in this release (see below for details):
 
- Still more Media Foundation work. - Improvements to Active Directory LDAP support. - A few more modules converted to PE. - Improvements to gdb proxy mode. - Various bug fixes. 
 
The source is available from the following locations:
http://dl.winehq.org/wine/source/5.x/wine-5.6.tar.xz http://mirrors.ibiblio.org/wine/source/5.x/wine-5.6.tar.xz 
 
Binary packages for various distributions will be available from:
http://www.winehq.org/download 
 
You will find documentation on
http://www.winehq.org/documentation 
 
You can also get the current source directly from the git repository.
Check
http://www.winehq.org/git for details. 
 
Wine is available thanks to the work of many people.
See the file AUTHORS in the distribution for the complete list.
 
 
Bugs fixed in 5.6 (total 38):
 
19420 Passmark 7.0 2d benchmark tests fails without native gdiplus 21466 Multiple applications need NtQueryVolumeInformationFile 'FileFsVolumeInformation' class support (AVG Free 8.x/9.x Antivirus Edition, MSYS2) 24784 Explorer++ displays disabled toolbar icons incorrectly 27324 Cossacks II (DotEmu version) refuses to start from its install directory (path too long?) 30810 Keygener Assistant 2.x: main window has incorrect size and contents are all black 31207 Monogram GraphStudio v0.3.x crashes when using Graph- >Insert Filter 33290 Fullscreen games cause panning configurations to be generated on some NVidia proprietary drivers 34014 Star Wars KOTOR II: The Sith Lords: Movies/cutscenes do not play with opengl on 37029 Evernote 5.5.x - unable to capture webcam note 37043 Keyboard input broken in Roblox Player 37051 Roblox Studio embedded webpage does not load consistently or properly using built-in winhttp 38856 LEGO Lord of the Rings crashes randomly 41610 ChurchBoard: Trying to create a window(about 3 minutes). And the error takes off. 41740 Diablo 3's mouse sprite stops moving, but the mouse is still working. 42072 Dead Space (Steam) crashes on save with "divide by zero" error 42479 MYOB Accounting v18.5.x crashes on startup 43704 Contacam crashes 47083 MySQL 8.0.x community installer (.NET 4.5.x app) fails to configure mysql, needs support for WS_AF_INET6 in 'iphlpapi.GetExtendedTcpTable' 47109 WineVulkan ICD isn't registered in wineprefixes 47362 Media Feature Pack for W10N requires rtworkq.dll 47794 Rockstar Games Launcher installer button images do not display 47825 Webex Meetings crashes 48611 Cairo Shell v0.3.x (.NET 4.7 app) crashes due to missing 'HKCU\\Software\\Microsoft\\Windows NT\\CurrentVersion\\WinLogon\\Shell' registry sub-key 48623 Error authenticating to LDAP controller 48729 Binary Domain has misplaced text in configuration tool with builtin d3dx9_43 48766 Late Shift doesn't work properly 48778 Star Wars: The Old Republic crashes shortly after intro screen 48788 null pointer in wined3d_palette_set_entries with Diablo GOG 48798 RegCloseKey: Uninitialized read from get_language_sort 48806 Panzer Corps 2 needs msvcp140.dll.? _XLgamma[email protected]@@[email protected] 48816 The explorer doesn't support '/cd' option 48832 Magic The Gathering Online: client does not start due to long file names since 2020-03-25 update 48838 Wine fails to build wldap32 if LDAP is not installed 48844 Magical Scramble Demo 1.20P shows white boxes instead of pictures. 48846 msvcr90/tests/msvcr90.c: error: variadic functions must use the base AAPCS variant 48888 error: redefinition of typedef ‘_onexit_t’ [/dlls/d3dcompiler_33] 48897 Building fails with '/usbin/ld: cannot find -ldl' 48902 Warframe launcher fails to replace updated Launcher.exe the first time (works when Retry option pressed, as Launcher.exe deleted first time) 
submitted by catulirdit to linux_gaming [link] [comments]

I made 36k profit in a demo account..

Hello fellas, I started trading around 4 months ago, i installed the iq option and started trading with a demo account (you start with 10k) , first days i was losing (i lost all 10k), and then from gathering informations and sticking to a plan with a disciplined mind, i flipped the script and made 36k profit. It made me think since it's a demo account maybe it's just a way to motivate you and deposit money, so that's really my question.. Is it like a "scam" or is it real (keep in mind in mind i trade stocks not binary option or whatever)
submitted by Twy37 to Trading [link] [comments]

MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

submitted by cuavas to cade [link] [comments]

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