Anyone else rolling their own numerics?

XNA Framework

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    - Camera Help Sorry if I wasnt clear. Basically what we are doing is this. 1stly you take your model that you are following, calculate its matrix however you are doing that. Once you have done that that matrix contains its rotation and position in the world. Multiplying a second fixed matrix with the matrix of what you want to follow will move the result a fixed difference from the model you are following. We then invert it to make it work properly as a view matrix. So........ //Move around and rotate the player as you see fit //Move the camera 10 units directly behind the player Matrix CameraDistanceFromModel = Matrix.CreateTranslation(0,0,10); //move the view matrix to the a point relative to the player matrix Matrix ViewMatrix = modelToFollowMatrix*CameraDistanceFromModel; //The ViewMatrix position is now correct, however needs inverting to make it work (someone better at maths will be able to explain why) ViewMatrix = Matrix.Invert(ViewMatrix); //How to use the data in a basic Effect to render BasicEffect be = new BasicEffect(); bs.World = modelToFollowMatrix; bs.View = ViewMatrix ; //Render stuff here Note the code is pretty pseudo codey. I'm not very good at explaining things like this, and i hope I havent confused you more! N Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - main menus for newbie I have written a very simple GameState program too. Now this prototype doesnt implement a menu as Georges does but I use another technic to control the flow of the program. I place GameStates on a Stack and as states are instanciated they are pushed onto this stack. Whenever a stat is not needed it is popped off this stack. Its a really simple structure once you understand the code and it is very extendable. Ive posted it in this thread: http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=1039056&SiteID=1 In conjunction with Georges GameState project you'll be popping out full games in no time. :) Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Another Alpha Blend Question in Managed DirectX 9 I am trying to draw a textured transparent square. Here is the drawing code: CustomVertex.PositionColoredTextured[] verts = new CustomVertex.PositionColoredTextured[4]; verts[0] = new CustomVertex.PositionColoredTextured(-10.0f, 10.0f, 0, Color.FromArgb(128, 255, 255, 255).ToArgb(), 0, 0); verts[1] = new CustomVertex.PositionColoredTextured(-10.0f, -10.0f, 0, Color.FromArgb(128, 255, 255, 255).ToArgb(), 0, 1); verts[2] = new CustomVertex.PositionColoredTextured(10.0f, 10.0f, 0, Color.FromArgb(128, 255, 255, 255).ToArgb(), 1, 0); verts[3] = new CustomVertex.PositionColoredTextured(10.0f, -10.0f, 0, Color.FromArgb(128, 255, 255, 255).ToArgb(), 1, 1); device.SetTexture(0, grassTexture); device.VertexFormat = CustomVertex.PositionColoredTextured.Format; device.DrawUserPrimitives(PrimitiveType.TriangleStrip, 2, verts); And I have the following to enable alpha blending: device.RenderState.SourceBlend = Blend.SourceAlpha; device.RenderState.DestinationBlend = Blend.InvSourceAlpha; device.RenderState.AlphaBlendEnable = true; It seems like this should work from the tutorials I've seen and since I'm setting the alpha of the color for each vertex to 128, but unfortunately this draws the square opaque. I know that alpha blending is working because If I load a texture with an alpha channel it is transparent where it's supposed to be, and if I use CustomVertex.PositionColored it also works fine. I read on the MSDN that Renderstate.DiffuseMaterialSource might help, but I've tried all three settings and this did not help... so I must be doing something wrong... again... Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - C# - Managed DirectX - Secondary Monitor NumberKruncher wrote: Somehow I need to get my program to run fullscreen, whilst allowing the user to interact with Windows on the primary monitor. The code supplied (within #if DEBUG) will do exactly that. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Looking for an example using a 2D back buffer I think this is what you're looking for. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Animation Component Released Hi , do you have a working demo This may help many see what you have done ..Tridex.... Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Collision Detection Perhaps we need more information. What is a "level" that you refer to Landscape other objects If landscape, are you using a Model for it A model has ModelMeshes that contain the vertex buffer for all its MeshParts. You would need to transform them (from model space to world space) then each meshpart describes the indices for their triangles that index into the vertices you transformed. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Three red lights on my 360 A wired connection is recommended , not required. Although Frank was explicit about the wired support, we've since found that it works reasonably well. For anyone who is using a wireless adapter with their Xbox 360, try it with wireless first. If the results are really poor, then use a wire. Basically, if your signal strength is good then you won't notice any difference. If you have a brick wall and a microwave running between your Xbox 360 and your router, you will probably get very frustrated at how slow things get (deploying files and debugging). --Stephen Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Texture Coordinate Issues Oh; that would be a syntax mistake. try skyboxVertexList[0].TextureCoordinates = new Vector2 ((2f / 4f), (1f / 3f)); In C#, if you don't case the denominator as a float, it'll always cast return an int. What you were doing was taking 2 / 4 (0.5) casting as an int (1) and then casting as a float (1.0f) for the x, taking 1 / 3 (0.3333) casting as int (0) and then casting it to float (0.0f) I do that ALL the time. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - please take new forum posts over to http://creators.xna.com Wow I just noticed that you have to have an X-Box Live account to even make a new post in the new forums. Does this mean that Windows game developers who do not own X-Boxes are to be left high and dry with no forum support Seems like the XNA Team wants to make their product lose popularity. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Multitexturing in fx I'm happy today :-) Having finally got our creator club website live to the public, I can now point you to a sample that shows how to do exactly this: http://creators.xna.com/Headlines/developmentaspx/archive/2007/02/13/Sprite-Effects-Sample.aspx Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Invoking MSBuild programmatically at runtime (editor model building and loading) The problem is exactly as the error message says, there is no matching assembly. This is probably because Shawn wrote that for beta2 and there has been a release since then so the PublicKeyToken has changed. The fully qualified assembly name for that assembly in v1.0 is "Microsoft.Xna.Framework.Content.Pipeline, Version=1.0.0.0, Culture=neutral, PublicKeyToken=6d5c3888ef60e27d". Cheers, Leaf. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Newbie: Package 'Visual Studio IDE Package' has failed to load properly One of my problems is why do I have to Uninstall Visual Studio (which takes hours to load) in order to get the Express Version of C# and XNA Game Studio to run Professionals using Visual Studio are not going to like that. I now deleted an reinstalled for the fourth time the third time also having the same error as listed above on an Win XP machine (P 2.8 mhz, 1 gig Ram, 400 gigs hd, SP 2 loaded). Let's see if this fourth time works I just deleted the XML parsing stuff from Microsoft. Maybe this time Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Space Dust And Particles I tried implementing a small system, but it's not very scalable. For instance, I start seeing performance drop around 1000-1500 point sprites. I'm using additive blending and not depth sorting, but I'm wondering where to start looking for the problem. I've uploaded the code to http://code.grave-media.com/SpaceDustRenderer.cs if you want to take a look and offer any suggestions. I tried to make it able to support multiple textures in a (hopefully) efficient way. I'm thinking that my usage of the foreach a lot might be hurting a little. Also I'm figuring perhaps my matrix math is killing me too, but I really don't know for sure. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Efficiency of Threads on the 360? In windows, the operating system does the allocation for you based on cpu usage. You can set the affinity but, it will not determine which processor you run on. On the 360 however, the affinity is needed otherwise the 360 will not allocate your thread to a seperate processor at all. The 360 is designed to do multithreading for games and so the Microsoft guys needed to ensure that the cpu cores could be best used by developers hence thread affinity is actually taken into account when allocating resources. In the world of windows, the operating system decides resource allocation and so is free to ignore your processor requests based on system load at the time the request was issued. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Must we wait another 12 hours ? Wow! I wasn't expecting it for another couple hours. Sweet. Now I just need to get home and fire up the 360 and see if the Creator's Club is up. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Vector array style accessing vector element using ".field" notation is faster than accessing as "[index]" notation, because accessing trough an index requires some extra math, while accessing as a field requires a simpler memory addressing Well, maybe, on some CPUs. However, both x86 and PPC have instructions that access "register plus register displacement" in a single cycle, just like they have "register plus constant" in a single cycle. Thus, there is really no micro-optimization difference between the two. Meanwhile, it's unlikely that, even if there were a difference in instruction count, that you would notice a difference in practice. The cache miss of accessing the vertex data in the first place will likely swallow the entire cost of calculating -- even on an in-order pipeline like the PPC found in the Xbox. Now, if you want indexing, you can take the address of the "x" element as a float*, and index that. You'll need to use unsafe code to do this, but it's quite possible. Just don't index outside the actual vertex, or you'll be ... unsafe :-) Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Vector array style accessing vector element using ".field" notation is faster than accessing as "[index]" notation, because accessing trough an index requires some extra math, while accessing as a field requires a simpler memory addressing Well, maybe, on some CPUs. However, both x86 and PPC have instructions that access "register plus register displacement" in a single cycle, just like they have "register plus constant" in a single cycle. Thus, there is really no micro-optimization difference between the two. Meanwhile, it's unlikely that, even if there were a difference in instruction count, that you would notice a difference in practice. The cache miss of accessing the vertex data in the first place will likely swallow the entire cost of calculating -- even on an in-order pipeline like the PPC found in the Xbox. Now, if you want indexing, you can take the address of the "x" element as a float*, and index that. You'll need to use unsafe code to do this, but it's quite possible. Just don't index outside the actual vertex, or you'll be ... unsafe :-) Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - The Unofficial "Hooray I'm Done With my DBP Game" Thread Almost done with mine but I'll have to wait until tomorrow night to upload it. It's pass midnight right now and I need sleep. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - XNA Creator's Club content? Ive heard If you only have a silver Xbox live subscription you get a Gold account with your XNA creators club membership is there any true to this What about extra demos or forums Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Globtrotting and Creators Club and DreamBuildPlay Thanks for the reply. My laptop is fairly underpowered, and I've got most of the gameplay hammered out. I mainly want to work on graphics/polish from here on out, so I'll probably bring the 360. Yeah, it's probably going to suck lugging it around, but it's better than a desktop! I'm really looking forward to more contest details (as I have been since it was announced!) Thanks for the update! B1narySh0t : So this means you can only use one computer to deploy to one xbox per creators club account If so that kind of sucks. I'd like to use my desktop while at home and the laptop on the road... Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - InvalidCastException help I was thinking that, but the strange thing is that he said the code worked in one case and not another which led me to question where this code is. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Anyone know any good 3D (for 2D) programming tutorials? Here are a couple of excellent tutorials I use (I use the unmanaged versions, though, so that's based on those tutorials and what other people said). DirectX 9 Tutorial using C#, C++ and Visual Basic Managed DirectX 2.0 Riemer (the writer of the first site) is porting over to XNA, but he still keeps up the managed site. I hope those help. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - XACT and MSReverb Hi Im looking for tutorial on how to use MSReverb with XACT. I need to change 'ReflectionsDelay' reverb parameter from engine. I'v created MSReverb filter, attached all sounds to it, then created new global variable called MYRefDelay (type: public, scope: global, controll: monitored) then under RPC presets double clicked on MSReverb, then assigned MYRefDelay to reverb ReflectionsDelay, then modified curve as i need to map MYRefDelay range to reverb ReflectionsDelay range. Now in file: index = engine->GetGlobalVariableIndex("MYRefDelay"); // index is valid engine->SetGlobalVariable(index, 100.0f); // HRESULT is OK but there is no any change in played sound :( What I am doing wrong When in XACT GUI I change variable value, I HEAR the change. When for example to the MyRefDelay variable i assign 1::Pitch inside xact gui i hear the change of sound speed. so code seems to be ok. Thanks for any ansfers. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Starting 3D from 2D I would check out xna101.net. It teaches you to create a simple game in 3D to get you thinking about three dimensions. Also covers some basic collision handling and loading models. Should be enough to get you started. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - The problem of D3DXCreateTexture hi, I'm using D3DXCreateTextureFromFile to display the picture,but i got some problem on it, the picture has a white color background, so i wish to make the white color background transparent. Last time a guy told me use the D3DXCreateTexture or D3DXLoadSurface, and it has a colorkey can make the color transparent, but i not sure which one is the color key Is it have any example can refer How to load the picture file i want from my computer by using D3DXCreateTexture . HRESULT D3DXCreateTexture( LPDIRECT3DDEVICE9 pDevice, UINT Width, UINT Height, UINT MipLevels, DWORD Usage, D3DFORMAT Format, D3DPOOL Pool, LPDIRECT3DTEXTURE9 * ppTexture ); The code below is how i write the code in my program void InitPlayingScene(IDirect3DDevice9* pd3dDevice) { D3DXCreateTextureFromFile( pd3dDevice, L"BKG.jpg", &g_pBKGTexture ); D3DXCreateSprite( pd3dDevice, &g_pBKGSprite); D3DXCreateTextureFromFile( pd3dDevice, L"duck3.bmp", &g_pDuckTexture ); D3DXCreateSprite( pd3dDevice, &g_pDuckSprite); } void CALLBACK onPlayingSceneRender(IDirect3DDevice9* pd3dDevice) { DuckVec = D3DXVECTOR3(x, y, 0); // render the background of the playing scene SetRect(&rc, 0, 0, 120,60); g_pDuckSprite ->Begin( D3DXSPRITE_DONOTSAVESTATE); g_pDuckSprite ->Draw ( g_pDuckTexture, &rc, NULL, &DuckVec, 0xFFFFFFFF); g_pDuckSprite ->End(); } Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - XNA (C#) Random Number Generation Hey everybody, I have recently been coding up a small 8-bit RPG, when (and of course, anyone who knows about coding RPGs would know this) all of a sudden, I realized that I had a need for a random number generator. Having learned a little bit in C#, I thought it would be similar in XNA, so I typed up the following: Random Damage = new Random (); int RandomNumber = Damage.Next(3); int PlayerDamage = Damage; I thought this was pretty straight-forward, but I guess it isn't. I'm getting the following errors: int RandomNumber = Damage .Next(3); A field initializer cannot reference the nonstatic field, method, or property 'WindowGame1.AvatarBase.Damage' int PlayerDamage = Damage ; A field initializer cannot reference the nonstatic field, method, or property 'WindowGame1.AvatarBase.Damage' And lastly... int PlayerDamage = Damage ; Cannot implicitly convert 'System.Random' to 'int' I've searched up the forums and didn't find much similar (and hopefully this is the correct forum to place this). Any suggestions would be great. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Using Game (and GameComponents) in a Windows Forms editor? There is another solution that everyone seems to forget. How about windows controls on the gamewindow That is how I am doing, works really well and you have the advantage that your game objects will act the same as in your game becuase you are using the same game class. theTroll Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - IDrawable interface and a position qrli You're actually right about my intentions about what I planned to use the interface for and I have thought about it and come to the conclusion that the interfaces shouldn't be the same for scene objects and game components. Although the the difference in definition exists, I still see the two kinds as one outside the XNA framework. But inside the XNA framework there is a difference and therefore I should define two different interfaces or at leat the one for the scene objects. But let's say that you have that game component that renders whole sprite or UI layers, the position could still exist as a position offset like location on a System.Windows.Forms.Label is relative to its parent . My point is that it is only in rare cases where you actually have no position for a game component that implements IDrawable, but maybe I'm wrong S. I see where you're going but in that case I'd say that the interface name should be IDraw :) Visible and DrawOrder can prove to be very usefull for drawing logic and I would hate to define additional interfaces for the properties like IVisible, IDrawOrder and IPosition. Also DrawOrder and Visible is thought of being checked before the Draw method might be called by some kind of parent/owner object. So the object would need a way to make sure that the properties are available, and the interface is a good way to solve that. Moving on, I think that you are right about rotation and scaling. They should also be there if position is. Best regards, Robin Theilade Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Question about changing default target drawing layer I think you need to be careful with your terminology here. "Layer" isn't really a word that means anything in this context - it seems like you're maybe mixing up some other concept that you found somewhere else Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - XNA Asteroids game in the Channel 9 XNA launch video Definitely. Let's put together a petition ALL THOSE THAT WANT THE XNA ASTEROIDS GAME (FROM THE CHANNEL 9 VIDEO ) RELEASED FOR ALL TO ENJOY, PLEASE SIGN BELOW I'll start things off.. XNA Rockstar Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.
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    - Putting a hole in a sprite The ZMan wrote: If you modify the sprite by setting some of the pixels to have an alpha component then your sprite will draw with the 'hole' This would only work if he had no transparent parts of the sprite except the hole. If you do have tranparency in another part of the sprite, it can be done by switching between two different sprites (one with a hole one without) or by using one sprite with a hole and a second sprite filling in the hole, switching the second sprite on and off depending on whether the hole is closed or open. EDIT: Sorry, you posted while I was posting. For this I think you would either have to access the texture data or create a bitmap from it so you can edit the color values at the desired location. You would change these values either to a color that is predetermined for transparency or an rgba color with alpha value reflecting just how transparent it will be. Tag: XNA Framework Anyone else rolling their own numerics? Game Technologies: DirectX, XNA, XACT, etc.

Jesse Towner

Just wondering how many other people out there are finding that XNA numerical classes/structures fall a little short of their needs and therefore are writing their own

For us, we needed to give our scene graph objects a coordinate frame where the rotation, scale, and translation transformation components are kept separate from one another; this is something similar to what is described in the book 3D Game Engine Architecture (http://www.amazon.com/Game-Engine-Architecture-Engineering-Applications/dp/012229064X).

XNA didn't quite fulfill this niche, which is understandable as I imagine one constraint during its design was to make it easier to use.

So, in the end, I'm thinking about writing my own 3x3 matrix struct, and my own Transform struct (which represents the above mentioned coordinate frame construct). Has anyone run into any problems integrating their owns numerics with XNA's

Re: XNA Framework Anyone else rolling their own numerics?

Shawn Hargreaves - MSFT

Is there any reason (other than perhaps perf) why you couldn't build this kind of abstraction on top of the XNA math primitives

If people are finding a need to roll their own math from scratch, I'd like to understand why that is and what exactly we might be missing from the framework.

Re: XNA Framework Anyone else rolling their own numerics?

Bill Reiss

Well it's not quite the same thing, but I felt a need to create my own Rectangle struct that uses floating point numbers instead of ints. It made it easier to interpolate values when smoothly scrolling and moving sprites.