private static SMVertex GetSMVertexFromTriangle(MilkShape milkShape, List <MilkShapeBoneMap> milkShapeBoneMap, ms3d_triangle_t t, int triangleVertex)
{
// Only focusing on one of the three triangle vertices
var triVertIdx = t.VertexIndices[triangleVertex];
return(new SMVertex
{
// Get position of vertex
Position = milkShape.Vertices[triVertIdx].Position,
// Get normal of vertex (stored with triangle in Milkshape for some reason)
Normal = t.VertexNormals[triangleVertex],
// Texture coordinate needs "reversal" since I "reversed" it earlier
// Also the (unused?) Z coordinate always appears to reflect the vertex Z, although
// I don't know if that's a requirement or a quirk, but either way...
TexCoord = new Vector3(t.TextureCoordinates[triangleVertex].X, 1.0f - t.TextureCoordinates[triangleVertex].Y, milkShape.Vertices[triVertIdx].Position.Z),
// This uses the bone map just in case the MilkShape indexes don't line up with
// the intended indexes...
BoneIndices = milkShape.Vertices[triVertIdx].BoneIdsAndWeights
.Where(biw => biw.BoneId != -1)
.Select(biw => milkShapeBoneMap.Where(bm => bm.MilkShapeJointIndex == biw.BoneId).Single().SMBoneIndex)
.ToArray(),
// Finally the MilkShape weights are stored as 0-100 byte-sized values, and we
// must convert back (granted with loss)
Weights = milkShape.Vertices[triVertIdx].BoneIdsAndWeights
.Where(biw => biw.BoneId != -1)
.Select(biw => biw.Weight / 100.0f).ToArray()
});
}
// Gets or generates an SMVertex for a vertex on a MilkShape triangle
private static ushort GetLocalVertexForMSTriangleVertex(List <MilkShapeTempVertex> milkShapeTempVertices, MilkShape milkShape, List <MilkShapeBoneMap> milkShapeBoneMap, ms3d_triangle_t t, int triangleVertex)
{
// This will provide the "close enough" rating of texture coordinates
// to decide that a vertex with the same MilkShape index as well as
// "close enough" texture coordinates is the same overall vertex.
const float texCoordEpsilon = 1.0f / 128.0f; // This is assuming that we're dealing with textures 128x128 and under, which is probably true
// Get the texture coordinates used by this vertex of the triangle,
// as it will be part of the consideration of "sameness" of other vertices
var triangleVertexTexCoord = t.TextureCoordinates[triangleVertex];
// The primary consideration is MilkShape's own vertex index
var triangleVertexIndex = t.VertexIndices[triangleVertex];
var resultVertex = milkShapeTempVertices
.Where(tv =>
// Must come from same vertex in MilkShape's pool...
tv.MilkShapeVertexIndex == triangleVertexIndex &&
// ... and be "close enough" with the texture coordinates
Math.Abs(triangleVertexTexCoord.X - tv.SMVertex.TexCoord.X) < texCoordEpsilon &&
Math.Abs((1.0f - triangleVertexTexCoord.Y) - tv.SMVertex.TexCoord.Y) < texCoordEpsilon
).SingleOrDefault();
if (resultVertex == null)
{
// If we don't have one quite like this, then we need to create it!
resultVertex = new MilkShapeTempVertex
{
MilkShapeVertexIndex = triangleVertexIndex,
MeshLocalVertexIndex = milkShapeTempVertices.Count,
SMVertex = GetSMVertexFromTriangle(milkShape, milkShapeBoneMap, t, triangleVertex)
};
milkShapeTempVertices.Add(resultVertex);
}
return((ushort)resultVertex.MeshLocalVertexIndex);
}
