DirectX - How to pick a point on 3D object

Game Technologies: General

- Previous
  - 1
    - Using XNA On Windows Boot Of MacBook? This is an odd question. I'm more of a Mac person for my daily routine, but I love XNA and want to use it for my game programming. I currently have a PC tower which is my primary programming station, but I'm about to buy a new Mac laptop and wondered if anyone here has had any experience using XNA while booting Windows on a MacBook with BootCamp. My main concern is the graphics. It uses the Intel GMA 950 which (according to Intel's site) supports up to shader version 2.0 in hardware and 3.0 in software, but I'm wondering how accurate that is, i.e. is it a supported feature that will only run at 2fps Otherwise I might get the MacBook Pro and use that to boot Windows and use the X1600 :). Sorry if you don't want me mentioning the Apple computers, but for my daily routine, it's my main machine, but XNA is my programming environment so I just wanted to see if anyone here did this already. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 2
    - Processor Parameters I am using a model processor to produce a path finding network. It is working quite well! http://sharpx.blogspot.com/2007/01/first-steps-along-path.html The green nodes are some offset away from the corners that were detected as significant to the path network. I would like that offset to be configurable; preferably as a property of the file in Visual Studio. How do I provide custom parameters to a processor Thanks, Brandon Bloom Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 3
    - issue about DrawIndexedPrimitives hi. one of the DrawIndexedPrimitives method parameters is NumVertices that specify number of vertices during the call as all you know. but i faced a problem that this parameter reads vertices that are one after anothe in the vertexbuffer. let me explain my problem on a picture: for example i have such vb: 1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16 and i need to draw triangles that uses 1, 2, 5 and 6 vertices i.e. 4 vertcices at all. but as you may guess if i will pass 4 as numvertices function will only read 1, 2, 3, 4 verts. my question is: what is better 1. to pass whole (or for example bigger part of vb) to function 2. fill my vb in block-style, i.e.: 1 2 3 4 5 6 7 8... where 3 and 4 are equal to 5 and 6 accordingly and so on. p.s. it's interesing what stands behind DrawIndexedPrimitives (and any other draw call), how much vertices are really send to videocard etc.. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 4
    - 2d resets with nuclex fonts? heres my draw method... i think thats all thats relevant protected override void Draw(GameTime gameTime) { graphics.GraphicsDevice.RenderState.StencilEnable = true; graphics.GraphicsDevice.Clear(Color.CornflowerBlue); mLoader.DrawModel(tank, tankposition, camera.projectionMatrix, camera.viewMatrix); framerate.Draw(); #region 2D Resets graphics.GraphicsDevice.RenderState.DepthBufferEnable = true; graphics.GraphicsDevice.RenderState.AlphaBlendEnable = false; graphics.GraphicsDevice.RenderState.AlphaTestEnable = false; graphics.GraphicsDevice.SamplerStates[0].AddressU = TextureAddressMode.Wrap; graphics.GraphicsDevice.SamplerStates[0].AddressV = TextureAddressMode.Wrap; graphics.GraphicsDevice.RenderState.StencilEnable = true; //graphics.GraphicsDevice.RenderState.CullMode = CullMode; #endregion base.Draw(gameTime); } Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 5
    - Material vs Shader EDIT2: I was thinking some time, where is difference between surface and material... I found: Example - glass...it have a surface and some translucent calculations. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 6
    - XNA GSE for 360 ? - This Holiday Season ? http://blogs.msdn.com/xna/archive/2006/12/11/xna-game-studio-express-has-been-released.aspx \ Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 7
    - unloading model resources Im trying to figure out how to manually unload models/textures/shaders ect. Halp me Intertron! Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 8
    - Custom Content Processor - Usage Hi, I am looking from some advice on writing a custom content processor for XNA. I have been working on a tile engine and have my Windows based tile map editor up and running. This editor produces an XML file holding all the tile set bitmaps, a list of all the levels in the map and a list of layers on each level. I am thinking of using a custom content processor to load this XML file, parse it and serialise it to the xnb file. I then plan to write a custom importer which will create a top level map object which will hold the tile sets as Texure2D objects and a dictionary of levels in the map. Does this seem like the correct use for a content processor Andy Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 9
    - Custom soundtracks I've only had XNA Game Studio Express since yesterday, but I've been having a lot of fun with it. I've started working on a game which is coming along nicely, but one thing irks me - I can't figure out how to have music playing that stops when a user chooses a custom soundtrack instead. At the moment, when a user chooses their own track is starts playing fine, but the game soundtrack continues to play in the background. I'm sure I've missed something simple, but I can't for the life of me figure it out. Any hints would be much appreciated. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 10
    - Whats the deal with DirectX being owned by XNA? c1t1z3n0 wrote: it would seem the XNA team is starting to name all its additions to DirectX as seperate API's in order to reorganize and perhaps reinvent/rename/reconstruct DirectX into its own X*** architecture. Well a lot of the new additions (XInput and XACT) have XBox heritage where those naming conventions are more common (not being a XBox developer I don't know for sure). Whilst XInput/DirectInput and XACT/DirectSound have obvious relations they are seperate technologies such that there isn't a requirement to follow the naming convention of their relatives. But I can see how it'd be easier if they were the same c1t1z3n0 wrote: I'd rather the XNA team either swallow their pride and admit they are just an add-on to DirectX Managed Be careful with using the XNA name here - XNA Framework is analagous to the successor of MDX, but XNA as a whole includes other technologies (currently XNABuild). Also, there have been mentions of an MD3D10 in the future - which would suggest that XNA Framework isn't quite a replacement for MDX... c1t1z3n0 wrote: old Feb 2005 DX sdks just to install DirectShow headers that were already in DirectX and got "put back" into the Platform SDK. The PSDK is a prerequisite to the DXSDK, so this sounds a bit flawed to me. Use whichever DXSDK you want and ensure you have a reasonably up-to-date PSDK to give you the DShow headers Whatever happens with the naming and technology offerings I'm sure it'll be announced on the developer centre and discussed here - I doubt you'll miss it! hth Jack Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 11
    - Bug in BoundingFrustum.Contains()? A bounding box can be defined in different manners. In general, it has a size W x H x D, position and orientation, like any 3D object. The "same" or "equal" means that both volumes are equal in size, position and orientation. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 12
    - The Unofficial "Hooray I'm Done With my DBP Game" Thread Well, I've just finished uploading Space Fortress - a remake of Space Zap! from the early 80's. I've still got a list of things I wanted to add, but that I ran out of time for. The quote about adding people to a late project will make it later is very true. I'd started with a team size of three - Me, my wife, and my 3.5 year old playtester, Katrina. Feb 27th we added a new team member - Naomi. I'm just happy my wife is so supportive of my attempts to get a game built. Cheers to all, and the best of luck to one and all. Dan Lingman nogotogames.com Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 13
    - Where do I start Hello fellow gamers, I am the newb next door and I need someone to tell me where to start. Where is the best starting point in the road to a professional game designer Do I start with 2D games Or 3D Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 14
    - DXT compressed Textures Thanks for the reply! Interesting. I understand most of your response, but am not quite sure what you mean by "gamma correction == gamma 1.0" and I don't want to be "pretty lost". :) Could you elaborate a little more on that for my own understanding Gamma 2.2 Now, the part about DX1 + quater size L16 containing the exponent is very familary to me. We in fact could live with a few of the artifacts from bilinear filtering on the 360, but it's not ideal. I hope our next run at HDR texture is better. We are consistently mulitplying global intensity values with all or our LDR textures/cubemaps, etc.. to try and get them to the correct range of HDR, but it's a managment nightmare. We constantly have to tune and tweak HDR to keep it from over blooming or being too dark. I know a lot of it has to do with the fact that all of our assets are really LDR (normal RGB textures) that are being artificially scaled up into the HDR range. The main reason for this is that there isn't really an art package that allows the artist to view/edit RGBE images...at least not when production began. So really our whole art pipeline and tools is still in LDR. That's why I'm looking for the best bet in DX10... so thank you for your response. In terms of DX10, I was leaning towards the RGBE format since I'm familiar with it, but again, not sure what you mean by the verbage "cannot convert to gamma 1.0". Oh, and thanks for the link www.coretechniques.com ... I axiously await that. I sincerely appreciate your response! -L Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 15
    - ODD Bumpmap issue Now this gets stranger.... I just took a look at the images in my PIX file and they both look fine Yet when I took the first snap shot the bump map rendering was all munched up like before, the second shot was after I ran FXC and the render was sorted out... yet the images in the PIX file are identical rendering.... I guess there is no need to trawl through the data in there now as it obviously sees the two dumps the same. What could possibly be going on I also logged off and back on to see if this would set the render back to it's initial state, but it did not I needed to either totally shut down and restart my PC or play around with FXC until it killed the render again. I could then get back to a good render state by just running FXC with without editing any thing other than the opening project it launches with. Could this be down to me having a damaged copy of either FXC or GSE I have replaced r updated almost everything else other than the framework the and the IDE. Anyone got any ideas Thanks. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 16
    - Let's go 3d engine Don't fall in a hurry. We'll have the XNA GSE 1.0 to play with. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
- Next
  - 1
    - Rendering hundreds of models How do games like Medieval: Total War 2 render hundreds of skinned models running different animations on the screen and still run at a good frame rate Is it possible that the models are not skinned I can't get more than 100 skinned models (matrix palette size = 50, verts = 5000) to run without getting a noticeable frame rate hit. This has to do with the fact that I am using shader instancing and doing 100 draw methods. I confirmed this by taking out all the animation and update code and only calling draw 100 times every frame. It's possible that my shader is inefficient (the DirectX examples split the shaders up based on influences per vertex), but I don't think it would be that huge of a difference. My skinning function is very similar to those in the DirectX sdk: SKIN_OUTPUT Skin4( const VS_INPUT input) { SKIN_OUTPUT output = (SKIN_OUTPUT)0; float lastWeight = 1.0; float weight = 0; for (int i = 0; i < 3; ++i) { weight = input.weights[ i ]; lastWeight -= weight; output.position += mul( input.position, MatrixPalette[input.indices[ i ]]) * weight; output.normal += mul( input.normal , MatrixPalette[input.indices[ i ]]) * weight; } output.position += mul( input.position, MatrixPalette[input.indices[ 3 ]])*lastWeight; output.normal += mul( input.normal , MatrixPalette[input.indices[ 3 ]])*lastWeight; return output; }; The only way I can think to speed up performance is to store the interpolated keyframes in a texture (would have to be huge) and use shader 3.0 hardware instancing to designate the starting pixel location for the matrix palette in the texture. I don't even know if this would work (and I don't know how I would get it to work with dynamic keyframing), and somehow I doubt that this is how modern games solve this problem. Does anyone have any advice I've been suffering for a while trying to solve this. Thanks! Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 2
    - Get Screen Coordinates of Vertices? Hey, I'm looking to obtain the screen (X and Y) co-ordinates of vertices. Whenever I move my mouse over a vertex I want to change it's color, but don't know how to compare the mouse position with my vertices. Any suggestions Thanks Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 3
    - Question on deferred shading with normal mapping Thanks for the reply Shawn. My deferred shading output normals are in world space (type HalfVector4) whereas my normal maps were in tangent space. Your recommendation on using the 3x3 transpose worked like a charm. I've written a little tool that converts normal maps from tangent space to world space and havn't noticed anything more than 1 or 2 minor differences. Thanks again! Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 4
    - Use XNA to make a map maker? Even if you're doing 2D maps, having the XNA rendering in your map editor means you don't have to rewrite your rendering code for the game. Anything to lessen the development and make it easier is a good thing IMO. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 5
    - Bump Mapping i loop through the predefined palette 256 times, each time storing the a, r, g, b values (each are a byte long) in an array. I then read the P8 into a byte array. Once done i loop through that byte array and each time take the a, r, g, b of the predefined palette array at ['byte array'[x]] and slot them in one after another in a temp. array - which eventually becomes the normal map. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 6
    - Saving Files My game is now ready for 360 Super Stardom.. but i need to save high scores to make the replay value higher. Please could someone point me in the right direction of saving files and high scores Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 7
    - Blending Multiple RenderTargets to the BackBuffer (Another RT) Ok. I am trying to write a SceneManager that contains a list of RenderGroup. Each RenderGroup is responsible for rendering a set of items (models, etc) to a RenderTarget and then rendering their RenderTarget to the BackBuffer (in this case a RenderTarget that SceneManager sets). The Problem: Blending between RenderTargets is not working. I have it working so when a RenderTarget is rendered multiple times with separate passes in the PixelShader it blends in Add mode. Between to RenderTargets, or RenderGroups in this case the blending fails. No matter what order I have the RenderGroups setup, it just won't blend correctly. Here is a picture of what I am trying to do: http://images.jsedlak.org/random/Xna5D_SceneManager.jpg Here is the code... RenderGroup: https://opensvn.csie.org/viewcvs.cgi/Windows/Xna5D/Xna5D.Graphics3D/RenderGroup.cs root=Xna5D&view=markup SceneManager: https://opensvn.csie.org/viewcvs.cgi/Windows/Xna5D/Xna5D.Graphics3D/SceneManager.cs root=Xna5D&view=markup Game1.cs: https://opensvn.csie.org/viewcvs.cgi/Windows/Xna5D_PostProcessing/Xna5D_PostProcessing/Xna5D_PostProcessing/Game1.cs root=Xna5D&view=markup Or maybe there is a better way to go about this Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 8
    - Rectangle collision detection help i would be interested in hearing more about your solution to this problem. I solved the problem by evaluating the X and Y bounds of each sprint, and changing the direction of them if they ever intersect (i can post the code later tonight if you'd like to see it) but i would prefer to use a bounding box. I tried the example in the help docs, but i found it to be confusing since it worked in 3d, yet i am looking for a 2d example. I'm sure if i spent some more time on it i would have figured it out, but i wanted to see it work before heading off to bed last night :-) Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 9
    - Any suggestions for defining direction of partical effects on a 3D model? Hi all: I'm still playing around with XNA and figuring out what I can do with the current state of the technology. What I want to do is have a 3D model of a spaceship that has RCS thrusters and a main engine. The RCS thrusters and main engine will all have a particle stream to simulate rocket exhaust. Somehow, I need to define the size and type of rocket exhaust, and what direction it should take, and do so within the context of the XNA framework. I presume I'd need a custom processor for the model to identify where rocket exhaust nodes are (think named invisible cubes in the 3D model, like "MainEngine" and "YawRight"), but I'm stumped on how to define the direction of the particle stream in relation to the model itself. Perhaps something like "YawRightPort" means shoot the stream to the left, whereas "YawRightStarboard" means shoot the stream right. Any ideas Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 10
    - Compiling DX10 example with C99 compatible compiler (Pelles C) Have you tried replacing whole "__uiidof(ID3D10Texture2D)" with IID_ID3D10Texture2D Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 11
    - Optimized graphics question: Which is better? I'm in the process of developing an XNA game and am currently documenting the artwork portion of the game. I am specifically interested in optimizing the art assets so the game performs as best as possible. The game I am working on will target 720p as its native resolution. Of course, in the interests of compatibility, I'd like the game to support lower resolutions as well. My question is (seemingly) simple. Should I have the artists create assets targeting native 720p resolutions and scale downward in code or vice versa In addition, if creating small graphical assets is the way to go, what recommendations do you have for creating assets that scale well enough to appear as HD content. Now, I'm assuming the latter is a loaded question and am happy to RTFM of any resources anyone suggests. Hopefully I am not asking for world peace. :) TIA! - Robert Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 12
    - New XNA 3D tutorial Right. Certain changes to the device parameters might require the device to be recreated rather than just reset when toggling windowed/fullscreen. In that case, the graphics device reference would become invalid and graphicsManager.Graphics would get a new instance. If you hang on to the graphics manager rather than the device, you get the device update for free. Also, when the device is recreated, you need to recreate your SpriteBatch object, so that should be done in the LoadGraphicsContent method whenever loadAllContent is true. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 13
    - DreamBuildPlay is up!!! I'm not speaking for Microsoft, but if you want to enter you can always enter a US State and Zip code and phone number for now until they get that addressed. I'm assuming that you can edit your information later once that's been corrected. Again, I don't speak for Microsoft on that, that's just what I would do in your shoes. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 14
    - Capturing live video from a camera Hi, Have anyone tried to use a USB to capture live video and present it onto a form I wish also to augment this with another computer generated picture of mine..!!! Any help will be greatly apprciated.. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 15
    - 3d collision detection Actually, the whole point of GJK is that it works for concave-concave intersection, assuming that you have the "support mapping" for it. The problem is calculating good "contacts" if you're using a penalty/penetration based solver -- there's no one "best" direction to "extract" the objects, as they are not convex. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.
  - 16
    - Trouble Installing Refresh I feel dumb. It was in fact the incorrect sp1. Refresh install went fine after that. Tag: Game Technologies: General DirectX - How to pick a point on 3D object Game Technologies: DirectX, XNA, XACT, etc.

igorbaITALY

Hello everybody,

I'm working with DirectX to develop a simple 3D application in my VB.NET project.

Actually, I'm able to rotate, move and zoom my 3D objet and now I would like to implement the possibility to pick a point on the 3D object with the mouse.

In particular, the user must have the possibility to click everywhere on the object and put a "chek" on the selected point (mybe a circle or similar, I don't know at the moment).

How can I approch the problem From where can I start Does exist some tutorial that can explain me something of analogous

Thanks in advance for your help.

Igor

Top

Re: Game Technologies: General DirectX - How to pick a point on 3D object

The ZMan

http://www.mdxinfo.com/tutorials/picking.php - its c# but I've not see a VB version of 'pick'. There is a C++ one in the SDK.

ALso search, this question is asked and answered all the time in these forums or others. You will need to understand 3d transformation math and 2d barycentric coordinates.

Top

Re: Game Technologies: General DirectX - How to pick a point on 3D object

igorbaITALY

Thank you, now I've something to strat.

Top