Truevision3D - Community Forums

Hey,

I've started writing up a template for my shaders that work on actors. I've been using Sylvain's example as my reference. But I've gone wrong somewhere and I can't work out where.

This is the result I get:

http://www.azazeldev.org/stuffs/badactor.jpg

As you can see, Alyxs' vertices are being stretched in places. So i'm sure it is something in the TPN function. Ignore the light and tangent/bitangent stuff, that is just skeleton for later when I add stuff.

Code:

float4x3 m_Bone[52] : BONES;
float4x4 m_World : WORLD;
float4x4 m_ViewProj : VIEWPROJ;
int i_NumBone : BONESPERVERTEX;

texture Diffuse : TEXTURE0;

sampler2D DiffSample = sampler_state
{
Texture = (Diffuse);
};

struct vpin
{
float3 Position : POSITION0;
float3 Normal : NORMAL;
float3 Tangent : TANGENT;
float3 BiTangent: BINORMAL;
float4 BlendIN : BLENDINDICES;
float4 BlendWE : BLENDWEIGHT;
float2 UV : TEXCOORD0;
};

struct fpin
{
float4 Position: POSITION;
float2 UV : TEXCOORD0;
float3 LightVec: TEXCOORD1;
float3 Normal : TEXCOORD2;
};

struct tvin
{
float4 Colour : COLOR0;
};

void TPN(uniform int NumBones, float3 Pos, float3 Norm, float4 Weights, float4 Indicies, out float3 rPos, out float3 rNorm)
{
if(NumBones == 0)
{
rPos = mul(Pos, m_World);
rNorm = mul(Norm, (float3x3)m_World);
}
else
{
int4 Bone = D3DCOLORtoUBYTE4(Indicies);
int iArray[4] = (int[4])Bone;

rPos = 0;
rNorm = 0;

float Last = 0;

for(int i = 0; i < NumBones - 1; i++)
{
float4x3 m_Temp = m_Bone[iArray[i]];
Last = Last + Weights[i];
rPos += mul(Pos, m_Temp) * Weights[i];
}

Last = 1 - Last;
float4x3 m_Temp = m_Bone[iArray[NumBones-1]];
rPos += mul(Pos, m_Temp) * Last;
rNorm += mul(rNorm, (float3x3)m_Temp) * Last;
}
}

void vp(uniform int NumBones, in vpin IN, out fpin OUT)
{
float3 Pos;
float3 Norm;

TPN(NumBones, IN.Position, IN.Normal, IN.BlendWE, IN.BlendIN, Pos, Norm);

OUT.Position = mul(Pos, m_ViewProj);
OUT.Normal = Norm;
OUT.LightVec = float3(0, 0, 0);
OUT.UV = IN.UV;
}

void fp(in fpin IN, out tvin OUT)
{
float4 Col = tex2D(DiffSample, IN.UV);

OUT.Colour = Col;
}

vertexshader Array[5] = {
compile vs_2_0 vp(0),
compile vs_2_0 vp(1),
compile vs_2_0 vp(2),
compile vs_2_0 vp(3),
compile vs_2_0 vp(4),
};

technique aTechnique
{
pass pass0
{
vertexshader = (Array[i_NumBone]);
pixelshader = compile ps_2_0 fp();
}
}

Any help would be appreciated. Thanks.