Hello all,
I must be doing something wrong, because a google search for "BLENDINDICES & SetMatrixArray" returns only 5 hits...
However, this is where I am now, and it kinda makes sense to me... So here it is :
In order to use the GPU for displaying my MilkShape3D animation, I decided to create a Vertex Shader that will apply the bones' transformations to my vertices.
I am passing an array of matrices to the Vertex Shader. This array represents the different poses for each bones. I am also passing the vertex structure, in which I added a bone index information for each vertex.
Here is my vertex structure's definition in C++ and HLSL :
#define D3DFVF_BLENDVERTEX (D3DFVF_XYZ|D3DFVF_NORMAL|D3DFVF_TEXCOORDSIZE3(1)|D3DFVF_TEX2)
// The corresponding structure in the vertex shader is as described below
struct VS_INPUT {
float4 position : POSITION;
float4 normal : NORMAL;
float3 boneIndices : BLENDINDICES;
float2 texCoord : TEXCOORD0;
};
I have no idea how/why I came up with this definition of
D3DFVF_BLENDVERTEX. It was just random, after tries and failures. I would be glad to have information/correction regarding this structure.
The code below is my render function. It shows how I pass the parameters to the Vertex Shader, including the array of matrices:
m_pEffect->SetTechnique("RenderScene");
m_pEffect->SetMatrix("g_mWorldViewProjection", &modelViewProjection);
D3DXMATRIX SomeMat[25];
// tentative code
for (int i = 0; i < m_arrVertices.size(); i++)
{
int nBoneIndex = m_arrVertexBoneIds;
D3DXMatrixMultiply(&SomeMat[nBoneIndex], &m_arrBones[nBoneIndex].matWorldInv, &m_arrBones[nBoneIndex].matWorldAnim);
m_arrBlendVertices.p = m_arrVertices.p;
//D3DXVec3TransformCoord(&m_arrBlendVertices.p, &m_arrVertices.p, &SomeMat[nBoneIndex]);
m_arrBlendVertices.boneIndex[0] = nBoneIndex;
}
HRESULT hr = m_pEffect->SetMatrixArray("g_mhBones", &SomeMat[0], m_arrBones.size());
if (FAILED(hr))
return E_FAIL;
D3DBlendVertex_t *pVertices = NULL;
hr = m_pBlendVertexBuffer->Lock(0, 0, (void **) &pVertices, D3DLOCK_DISCARD);
if (FAILED(hr))
return E_FAIL;
//memcpy(pVertices, &m_arrBlendVertices[0], (sizeof(D3DBlendVertex_t) * m_arrVertices.size()));
hr = m_pBlendVertexBuffer->Unlock();
if (FAILED(hr))
return E_FAIL;
UINT uPasses;
m_pEffect->Begin( &uPasses, 0 );
for( UINT uPass = 0; uPass < uPasses; ++uPass )
{
m_pEffect->Pass(uPass);
m_pDevice->SetFVF(D3DFVF_BLENDVERTEX);
m_pDevice->SetStreamSource(0, m_pBlendVertexBuffer, 0, D3DXGetFVFVertexSize(D3DFVF_BLENDVERTEX));
for (i = 0; i < GetNumSubsets(); i++)
{
SetSubsetShader(i);
DrawSubset(i);
}
}
m_pEffect->End();
Now, if I uncomment the commented lines, and I remove the call to m_pEffect->Pass(uPass), I am simply displaying the animation through the CPU. I tried to implement the
D3DXVec3TransformCoord() function in my vertex shader as decribed below :
float4x4 g_mhBones[25] : Bones; // Our array of bone transforms
float4x4 g_mWorldViewProjection; // World * View * Projection matrix
struct VS_INPUT {
float4 position : POSITION;
float4 normal : NORMAL;
float3 boneIndices : BLENDINDICES;
float2 texCoord : TEXCOORD0;
};
struct VS_OUTPUT
{
float4 Position : POSITION;
float4 Diffuse : COLOR0;
float2 TextureUV : TEXCOORD0;
};
VS_OUTPUT VS_StandardSkinning( VS_INPUT IN )
{
VS_OUTPUT Output;
float4 v = mul(IN.position, g_mhBones[IN.boneIndices[0]]);
Output.Position = mul(v, g_mWorldViewProjection);
Output.Diffuse.a = 1.0f;
Output.Diffuse.rgb = 1.0f;
Output.TextureUV = IN.texCoord;
return Output;
}
technique RenderScene
{
pass P0
{
VertexShader = compile vs_1_1 VS_StandardSkinning();
}
}
Well, it just does not work. I can see my 3D model, but no animation --I actually think that it is pure luck if I can see my model ! It seems to me that either the array of matrices is not properly setup, or the access in the vertex shader does not work... and there is defintely something wrong with the
D3DFVF_BLENDVERTEX as well...
Any ideas ?
Thank you in advance.
Cheers
StratBoy61
[Edited by - StratBoy61 on November 28, 2006 5:55:00 AM]
