void ProcessMesh(Mesh mesh)
{
foreach(var face in mesh.Faces)
{
for(int b = 0; b < face.Indices.Length / 2; b++)
{
var tmp = face.Indices[b];
face.Indices[b] = face.Indices[face.Indices.Length - 1 - b];
face.Indices[face.Indices.Length - 1 - b] = tmp;
}
}
}
/// <summary>
/// Converts a single mesh to left handed coordinates.
/// </summary>
void ProcessMesh(Mesh mesh)
{
// mirror positions, normals and stuff along the Z axis
for (int i = 0; i < mesh.Vertices.Length; i++)
{
mesh.Vertices[i].Z *= -1.0f;
if (mesh.HasNormals)
{
mesh.Normals[i].Z *= -1.0f;
}
if (mesh.HasTangentsAndBitangets)
{
mesh.Tangents[i].Z *= -1.0f;
mesh.Bitangents[i].Z *= -1.0f;
}
}
// mirror offset matrices of all bones
for (int i = 0; i < mesh.Bones.Length; i++)
{
var bone = mesh.Bones[i];
bone.OffsetMatrix.M13 = -bone.OffsetMatrix.M13;
bone.OffsetMatrix.M23 = -bone.OffsetMatrix.M23;
bone.OffsetMatrix.M43 = -bone.OffsetMatrix.M43;
bone.OffsetMatrix.M31 = -bone.OffsetMatrix.M31;
bone.OffsetMatrix.M32 = -bone.OffsetMatrix.M32;
bone.OffsetMatrix.M34 = -bone.OffsetMatrix.M34;
}
// mirror bitangents as well as they're derived from the texture coords
if (mesh.HasTangentsAndBitangets)
{
for(int i=0; i<mesh.Vertices.Length; i++)
{
mesh.Bitangents[i] *= -1.0f;
}
}
}