Vector3 BuildVertexPosition(int meshIndex, int vertexIndex)
{
int i;
MD5Vertex vertex = mesh.Submeshes[meshIndex].Vertices[vertexIndex];
Vector3 position = Vector3.Zero;
for (i = 0; i < vertex.NumberOfWeights; i++)
{
MD5Weight weight = mesh.Submeshes[meshIndex].Weights[vertex.FirstWeight + i];
position += Vector3.Transform(weight.Position, mesh.Joints[weight.Joint].Transform) * weight.Weight;
}
return(position);
}
private void SetVertices()
{
int i, j, k;
for (i = 0; i < mesh.Submeshes.Length; i++)
{
for (j = 0; j < vertices[i].Length; j++)
{
MD5VertexFormat vert = new MD5VertexFormat();
MD5Vertex input = mesh.Submeshes[i].Vertices[j];
vert.Position = new Vector4(BuildVertexPosition(i, j), 1.0f);
vert.Normal = Vector3.Zero;
vert.TexCoord = input.TexCoord;
vert.BoneIndices = Vector4.Zero;
vert.BoneWeights = Vector4.Zero;
// Determine the boneIndices and boneWeights, if there aren't four bones effecting this joint the default zeros will work
vert.BoneIndices.X = mesh.Submeshes[i].Weights[input.FirstWeight].Joint;
vert.BoneWeights.X = mesh.Submeshes[i].Weights[input.FirstWeight].Weight;
if (input.NumberOfWeights > 1)
{
vert.BoneIndices.Y = mesh.Submeshes[i].Weights[input.FirstWeight + 1].Joint;
vert.BoneWeights.Y = mesh.Submeshes[i].Weights[input.FirstWeight + 1].Weight;
}
if (input.NumberOfWeights > 2)
{
vert.BoneIndices.Z = mesh.Submeshes[i].Weights[input.FirstWeight + 2].Joint;
vert.BoneWeights.Z = mesh.Submeshes[i].Weights[input.FirstWeight + 2].Weight;
}
if (input.NumberOfWeights > 3)
{
vert.BoneIndices.W = mesh.Submeshes[i].Weights[input.FirstWeight + 3].Joint;
vert.BoneWeights.W = mesh.Submeshes[i].Weights[input.FirstWeight + 3].Weight;
}
vertices[i][j] = vert;
}
for (j = 0; j < mesh.Submeshes[i].NumberOfTriangles; j++)
{
int index0, index1, index2;
index0 = indices[i][3 * j];
index1 = indices[i][3 * j + 1];
index2 = indices[i][3 * j + 2];
Vector3 side1 = BuildVertexPosition(i, index0) - BuildVertexPosition(i, index1);
Vector3 side2 = BuildVertexPosition(i, index0) - BuildVertexPosition(i, index2);
Vector3 normal = Vector3.Cross(side1, side2);
vertices[i][index0].Normal += normal;
vertices[i][index1].Normal += normal;
vertices[i][index2].Normal += normal;
}
for (j = 0; j < mesh.Submeshes[i].Vertices.Length; j++)
{
MD5Vertex vertex = mesh.Submeshes[i].Vertices[j];
Vector3 normal = Vector3.Zero;
for (k = 0; k < vertex.NumberOfWeights; k++)
{
MD5Weight weight = mesh.Submeshes[i].Weights[vertex.FirstWeight + k];
normal = Vector3.Transform(normal, Quaternion.Inverse(mesh.Joints[weight.Joint].Rotation));
vertices[i][j].Normal += normal * weight.Weight;
}
}
}
}