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Add Forum to Favorites | Send Topic To a Friend | View Forum FAQ | Track this topic Page: 1 2 »» |
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| Implementing Skin Meshes with DirectX 8 |
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Anonymous Poster |
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 Posted - 6/7/2002 9:05:02 AM |
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| To compile your example under DirectX 8.1 you need to make a couple of changes to CMeshNode.cpp: add DWORD* face_remap = new DWORD[dwfacecount]; LPD3DXBUFFER vertex_remap; result = D3DXCreateBuffer( dwfacecount, &vertex_remap ); change: // blend the mesh result = pD3DXSkinMesh->ConvertToBlendedMesh(MESH_WRITEONLY, padjacencyin, rgiAdjacency, &dwAttrCount, &pBoneCombinationBuf, face_remap, &vertex_remap, &pD3DXBlendedMesh ); add: delete face_remap; SAFERELEASE( vertex_remap ); Thanks for the article this stuff sure is confusing! |
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Kern Member since: 6/5/2002 From: Quebec, Canada |
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 Posted - 6/7/2002 9:09:31 AM |
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| You made a little mistake: delete face_remap; sould be changed to delete [] face_remap; face_remap = NULL; |
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Anonymous Poster |
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 Posted - 6/7/2002 12:05:33 PM |
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| Hey I'm getting the following linking errors using DX8.1 sdk: Compiling... StdAfx.cpp Compiling... CAnimationNode.cpp CFrameNode.cpp CMeshNode.cpp CObject.cpp CSkinMesh.cpp Exceptions.cpp main.cpp Generating Code... Linking... CAnimationNode.obj : error LNK2001: unresolved external symbol _TID_D3DRMAnimationKey CAnimationNode.obj : error LNK2001: unresolved external symbol _TID_D3DRMFrame CFrameNode.obj : error LNK2001: unresolved external symbol _TID_D3DRMFrame CFrameNode.obj : error LNK2001: unresolved external symbol _TID_D3DRMAnimation CSkinMesh.obj : error LNK2001: unresolved external symbol _TID_D3DRMAnimation CFrameNode.obj : error LNK2001: unresolved external symbol _TID_D3DRMAnimationSet CFrameNode.obj : error LNK2001: unresolved external symbol _TID_D3DRMFrameTransformMatrix CFrameNode.obj : error LNK2001: unresolved external symbol _TID_D3DRMMesh SkinMesh.exe : fatal error LNK1120: 6 unresolved externals Error executing link.exe. Creating browse info file... SkinMesh.exe - 9 error(s), 0 warning(s) |
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FantasyGuy Member since: 8/21/2001 |
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Posted - 6/9/2002 5:13:20 AM |
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| I wrote the sample code under DX 8. I haven't tried compiling it with DX8.1 yet. These external symbols (_TID_D3DRMFrame, ...) are the GUIDs of the mesh X templates. They are supposed to be contained in dxguid.lib. Make sure this library is included in: Project Settings->Link->Object/library modules Sorry for the spelling mistake in Fingure  I am not a native English speaker after all.Regards, Sarmad A. |
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Gaiiden GDNet Content Lead Member since: 8/30/2000 From: Lincroft, NJ, United States |
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 Posted - 6/10/2002 12:42:00 AM |
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| From the Articles and Suggestions forum: Original post by DamienBlews I had one little problem in the DX8 article just highlighted on the main site. You get a error when you try to compile the prog...maybe it was only with mine for some ungodly reason, but here goes... C:\Programming\skin_mesh_source\CMeshNode.cpp(181) : error C2660: 'ConvertToBlendedMesh' : function does not take 6 parameters You would simply find the line and the function, and add NULL values to the sixth and seventh arguments like so... result = pD3DXSkinMesh->ConvertToBlendedMesh( D3DXMESH_WRITEONLY, padjacencyin, rgiAdjacency, &dwAttrCount, &pBoneCombinationBuf, NULL, NULL, &pD3DXBlendedMesh ); thanks, and I'm hoping I was kinda right..hehehe |
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Cruath Member since: 4/25/2002 |
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Posted - 6/10/2002 3:36:25 AM |
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| Gaiiden, I guess that is one way to fix it... or you can do what Anonymous said in the first post here and change the function call and add 4 lines of code. |
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Anonymous Poster |
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Posted - 6/10/2002 10:10:47 AM |
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| Hi! I have a problem understanding how those matrices are created. I fully understand the notion of matrix stacks / matrix hierarchies. But I don´t undertand why they can be used with skinned bones that easily. Take for instance: FingerWorldMat = FingerMat * PalmMat * ForearmMat * ... * BodyMat FingerWorldMat then expresses a transformation from the finger´s local system into the worldsystem. Given a finger-geometry, where the joint of that finger-bone is at [0,0,0] (the origin), this matrix will transform the finger at its final position in the world - I fully agree. This will perfectly work with multipart bodies. But now what I don´t understand is, why Vw = Vm * M1 * w + Vm * M2 * (1-w) should work !? Lets make it more obvious: Vfinger = Vfinger* Mfinger * w + Vfinger * Mpalm * (1-w) Usually Vfinger is given in modelspace. So how can Mfinger _and_ Mpalm transform this vertex meaningful? Shouldn´t the vertex be transformed into the bones´ system (thereby moving the bone´s joint into the origin), before applying the bone local transformation and then being transformed back into modelspace? I´ve found no tutorial/paper yet, describing such a transformation. Am I stupid? Do I oversee something obvious ? skynet |
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FantasyGuy Member since: 8/21/2001 |
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Posted - 6/11/2002 3:33:32 AM |
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| skynet, you're not mistaken. What you've said is right, but it seems that you didn't read the article to the end. I have mentioned this in my article and this is a copy: "So what is the bone offset? It's important to know that all the vertices of the skin mesh are stored relative to one origin, which is the origin of the mesh and not the local origin of the bone. This means that in order to have the influence of the bone on the mesh, we should deform the mesh by the difference between the bone's current transform and the bone's original transform. Or in other words, we should transform the vertices to the bone's local space and then transform them back to the mesh's space using the new transform of the bone." Regards, Sarmad A. |
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Anonymous Poster |
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 Posted - 6/11/2002 11:35:14 AM |
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| I was wondering why the bitmaps are mirrored in this example? if you load the same .X file in DXSDKs example, 'SkinnedMesh' bitmaps are ok. |
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FantasyGuy Member since: 8/21/2001 |
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Posted - 6/12/2002 3:14:30 AM |
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| It's mirrored because it's using left hand coordinate system while the mesh is exported in a right hand coordinate system. You can correct this simply by using D3DXMatrixPerspectiveFovRH instead of D3DXMatrixPerspectiveFovLH and using CW polygon culling instead of CCW. Actually, it's not only the texture that's flipped, the whole mesh is flipped horizontally. |
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Anonymous Poster |
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 Posted - 8/22/2002 1:04:23 AM |
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| To enable smooth filtered textures, enter two lines in main.cpp function InitDevice void InitDevice( void ) { // set the states of the device g_pD3DDevice->SetRenderState( D3DRS_LIGHTING, TRUE ); g_pD3DDevice->SetRenderState( D3DRS_NORMALIZENORMALS, TRUE ); //Enter the following function calls. g_pD3DDevice->SetTextureStageState ( 0, D3DTSS_MAGFILTER, D3DTEXF_LINEAR ); g_pD3DDevice->SetTextureStageState ( 0, D3DTSS_MINFILTER, D3DTEXF_LINEAR ); //.... |
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Anonymous Poster |
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Posted - 8/22/2002 1:04:52 AM |
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| To enable smooth filtered textures, enter two lines in main.cpp function InitDevice void InitDevice( void ) { // set the states of the device g_pD3DDevice->SetRenderState( D3DRS_LIGHTING, TRUE ); g_pD3DDevice->SetRenderState( D3DRS_NORMALIZENORMALS, TRUE ); //Enter the following function calls. g_pD3DDevice->SetTextureStageState ( 0, D3DTSS_MAGFILTER, D3DTEXF_LINEAR ); g_pD3DDevice->SetTextureStageState ( 0, D3DTSS_MINFILTER, D3DTEXF_LINEAR ); //.... |
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frankoguy Member since: 8/23/2002 |
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 Posted - 8/23/2002 11:44:52 PM |
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| Sarmad, Thanks for your helful article/tutorial on Vertex and index-blended meshes. I've looked in many places for information like the code you offered and found your source code to be the most helpful. I've read quite a few programming books and articles on XMeshes, and none of the material even begins to cover real practical hands-on animation techniques beyond a "beginner's" grasp. The books I've read just refer me to the SDK examples, which I have to admit I find somewhat overwhelming. I know to write basic vetex shader code to animate sections of a cylinder, for example, but I'm really looking for much more instructional material that will get me up-to-speed on DX model animation to a professional level, so I can write original source code to animate vertices the way I want to (as vertex-blended index-blend) shader code and API pipeline, instead of just memorizing snippets of what someone else did. I've read "Rendering Tricks and techniques", "Zen of Direct3D", and other such books but they don't cover model animation on the level that you know how to do. What instructional books/article/resources..etc. would you suggest I persue?? Thanks, Frank |
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Anonymous Poster |
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 Posted - 9/23/2002 12:26:30 PM |
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| I dont speak english very well. So I hope that you will understand me: I have a problem. For example I have an object, which is animated and has 5 positions of my animation, but I need jump from third position to start of animation(first position).Could you tell me how? Thanks |
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popup Member since: 9/23/2002 From: Faroe Islands |
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Posted - 9/23/2002 12:28:52 PM |
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| I dont speak english very well. So I hope that you will understand me: I have a problem. For example I have an object, which is animated and has 5 positions of my animation, but I need jump from third position to start of animation(first position).Could you tell me how? Thanks |
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Weeks Member since: 7/3/2002 From: London / Leicester, United Kingdom |
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Posted - 12/16/2002 5:01:00 PM |
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| Cheers dude, Without your help i couldnt do my uni project Would be nice to see the code in c as i could undersatnd it easier, but that's just a personal preference thanks no end mate.Aaron |
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Riskbreaker Member since: 3/31/2002 From: Olathe, Kansas |
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Posted - 12/25/2002 9:03:37 AM |
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| This article's great! Very informative. I have a question on this bit, though: (in class CMeshNode, method GenerateMesh) // calculate the max face influence count if( (pD3DXBlendedMesh->GetFVF() & D3DFVF_POSITION_MASK) != D3DFVF_XYZ ) dwMaxFaceInfl = 1 + ((pD3DXBlendedMesh->GetFVF() & D3DFVF_POSITION_MASK) - D3DFVF_XYZRHW) / 2; else dwMaxFaceInfl = 1; } dwMaxFaceInfl is the argument for the render state of vertex blending... how does this equation come up with the required weighting? [edited by - Riskbreaker on December 25, 2002 9:05:08 AM] |
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NeoDirect3D Member since: 12/1/2002 |
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Posted - 12/27/2002 11:41:53 PM |
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| im really confused with this line... from CAnimationNode.cpp in the void CAnimation::SetTime(DWORD dwTime) dwtime %= aMatrixKey[dwMatrixKeyCount-1].dwTime; %= is a remainder operator right? so what does this do? it does dwtime / aMatrixKey[dwMatrixKeyCount-1].dwTime ? why is it important to get the remainder? is it part of a loop, because it is below the if statement, so i guess it just does this once... i don't really know what i am talking about... can anyone please explain me this... thanks |
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Anonymous Poster |
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Posted - 1/3/2003 11:29:34 PM |
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| hi..will someone pls explain to me in meshnode: DWORD dwAttrCount;//!< The attribute count what does this attribute do and contain ? |
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Riskbreaker Member since: 3/31/2002 From: Olathe, Kansas |
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Posted - 1/5/2003 2:56:00 AM |
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| To NeoDirect3D: Answering your question on using the remainder, that line is used to get the point of the XFile animation that should be rendered. This function is executed continuously as the program runs (more than once). aMatrixKey[dwMatrixKeyCount-1].dwTime This value is the total running time of the animation, in milliseconds (4880 for the tiny.x walk cycle animation, I think). The function is called with a value gotten from the standard time function, so using the remainder function gets a value between 0 and 4880. This way, the program knows which transformation matrix to use for rendering. Every time the value passes 4880, the % pushes it back to zero, and the cycle repeats. To AP, concerning the dwAttrCount: That's the number of bone combinations that the ConvertToBlendedMesh function returns. It correlates to the pBoneCombinationBuf, which holds the actual bone combinations for the mesh as D3DXBONECOMBINATION structures. You need to know this information for rendering. I hope this helps. [edited by - Riskbreaker on January 5, 2003 2:57:29 AM] |
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Anonymous Poster |
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Posted - 1/5/2003 3:52:13 AM |
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| thanks |
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Riskbreaker Member since: 3/31/2002 From: Olathe, Kansas |
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Posted - 1/5/2003 4:50:27 AM |
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| No prob. I have another question that hopefully someone can answer... In the SetTime() function of the CAnimationNode class, Why negate the x, y, and z quaternion key values for q1 and q2 before using D3DXQuaternionSlerp? Why's it necessary? |
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monkeyography Member since: 12/23/2002 From: USA |
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Posted - 1/19/2003 9:55:40 PM |
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| There's a bug in the CAnimationNode::SetTime function that will make animation based on position keys really herky-jerky. CAnimationNode.cpp line 492, which looks like: void CAnimationNode::SetTime(DWORD dwtime) ... // check for position keys if( aPositionKey ) { ikey1 = ikey2 = 0; dwtime %= aPositionKey[dwPositionKeyCount-1].dwTime; // get the two keys surrounding the time value for( ikey = 0; ikey < dwPositionKeyCount; ikey++ ) if( aPositionKey[ikey].dwTime > dwtime ) { ikey2 = ikey1; // BUG! the line should be ikey2 = ikey; The bug doesn't show up in the "tiny.x" example because all her animations are done with matrix keys rather than the rotation, scale, and position keys exported by most 3d programs. I love this tutorial though, thanks Sarmad!! |
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SDyer Member since: 5/26/2002 From: USA |
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 Posted - 2/2/2003 11:40:29 AM |
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| I'm compiling this under DirectX 8.1, and I get the following error: Exceptions.obj : error LNK2001: unresolved external symbol "char const * __stdcall DXGetErrorString8A(long)" (?DXGetErrorString8A@@YGPBDJ@Z) SkinMesh.exe : fatal error LNK1120: 1 unresolved externals DXErr8.h is included, DXErr8.lib is in the project settings, as is DSGUID.lib. What is missing? |
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