// "This template is instantiated on a per-mesh basis. Within a mesh, a sequence of n
// instances of this template will appear, where n is the number of bones (X file frames)
// that influence the vertices in the mesh. Each instance of the template basically defines
// the influence of a particular bone on the mesh. There is a list of vertex indices, and a
// corresponding list of weights.
// template SkinWeights
// {
// STRING transformNodeName;
// DWORD nWeights;
// array DWORD vertexIndices[nWeights];
// array float weights[nWeights];
// Matrix4x4 matrixOffset;
// }
// - The name of the bone whose influence is being defined is transformNodeName,
// and nWeights is the number of vertices affected by this bone.
// - The vertices influenced by this bone are contained in vertexIndices, and the weights for
// each of the vertices influenced by this bone are contained in weights.
// - The matrix matrixOffset transforms the mesh vertices to the space of the bone. When concatenated
// to the bone's transform, this provides the world space coordinates of the mesh as affected by the bone."
// (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/
// directx9_c/dx9_graphics_reference_x_file_format_templates.asp)
//
// Reads in a bone that contains skin weights. It then adds one bone weight
// to every vertex that is influenced by ths bone, which contains the name of the bone and the
// weight.
public void ImportSkinWeights()
{
isSkinned = true;
string boneName = tokens.SkipName().NextString();
// an influence is an index to a vertex that is affected by the current bone
int numInfluences = tokens.NextInt();
List <int> influences = new List <int>();
List <float> weights = new List <float>();
for (int i = 0; i < numInfluences; i++)
{
influences.Add(tokens.NextInt());
}
for (int i = 0; i < numInfluences; i++)
{
weights.Add(tokens.NextFloat());
if (weights[i] == 0)
{
influences[i] = -1;
}
}
influences.RemoveAll(delegate(int i) { return(i == -1); });
weights.RemoveAll(delegate(float f) { return(f == 0); });
// Add the matrix that transforms the vertices to the space of the bone.
// we will need this for skinned animation.
Matrix blendOffset = tokens.NextMatrix();
ContentUtil.ReflectMatrix(ref blendOffset);
skinTransformDictionary.Add(boneName, blendOffset);
SkinTransformContent trans = new SkinTransformContent();
trans.BoneName = boneName;
trans.Transform = blendOffset;
skinTransforms.Add(trans);
// end of skin weights
tokens.SkipToken();
// add a new name/weight pair to every vertex influenced by the bone
for (int i = 0; i < influences.Count; i++)
{
skinInfo[influences[i]].Add(new BoneWeight(boneName,
weights[i]));
}
}
/// <summary>
/// Loads a custom material. That is, loads a material with a custom effect.
/// </summary>
/// <returns>The custom material</returns>
private MaterialContent ImportCustomMaterial()
{
EffectMaterialContent content = new EffectMaterialContent();
tokens.SkipName();
string effectName = GetAbsolutePath(tokens.NextString());
content.Effect = new ExternalReference <EffectContent>(effectName);
// Find value initializers for the effect parameters and set the values
// as indicated
for (string token = tokens.NextToken(); token != "}"; token = tokens.NextToken())
{
if (token == "EffectParamFloats")
{
tokens.SkipName();
string floatsParamName = tokens.NextString();
int numFloats = tokens.NextInt();
float[] floats = new float[numFloats];
for (int i = 0; i < numFloats; i++)
{
floats[i] = tokens.NextFloat();
}
tokens.SkipToken();
content.OpaqueData.Add(floatsParamName, floats);
}
else if (token == "EffectParamDWord")
{
tokens.SkipName();
string dwordParamName = tokens.NextString();
float dword = tokens.NextFloat();
tokens.SkipToken();
content.OpaqueData.Add(dwordParamName, dword);
}
else if (token == "EffectParamString")
{
tokens.SkipName();
string stringParamName = tokens.NextString();
string paramValue = tokens.NextString();
tokens.SkipToken();
content.OpaqueData.Add(stringParamName, paramValue);
}
if (token == "{")
{
tokens.SkipNode();
}
}
return(content);
}