public ModelMesh CreateMesh(Schema2.Mesh srcMesh, int maxBones = 72)
{
if (_Device == null)
{
throw new InvalidOperationException();
}
var srcPrims = GetValidPrimitives(srcMesh).ToList();
var dstMesh = new ModelMesh(_Device, Enumerable.Range(0, srcPrims.Count).Select(item => new ModelMeshPart()).ToList());
dstMesh.Name = srcMesh.Name;
dstMesh.BoundingSphere = srcMesh.CreateBoundingSphere();
var srcNormals = new MeshNormalsFallback(srcMesh);
var idx = 0;
foreach (var srcPrim in srcPrims)
{
CreateMeshPart(dstMesh.MeshParts[idx++], srcPrim, srcNormals, maxBones);
}
return(dstMesh);
}
public MeshPrimitiveReader(MeshPrimitive srcPrim, bool doubleSided, MeshNormalsFallback fallbackNormals)
{
_Positions = srcPrim.GetVertexAccessor("POSITION")?.AsVector3Array();
_Normals = srcPrim.GetVertexAccessor("NORMAL")?.AsVector3Array();
if (_Normals == null)
{
_Normals = new XYZ[_Positions.Count];
for (int i = 0; i < _Normals.Count; ++i)
{
_Normals[i] = fallbackNormals.GetNormal(_Positions[i]);
}
}
_Color0 = srcPrim.GetVertexAccessor("COLOR_0")?.AsColorArray();
_TexCoord0 = srcPrim.GetVertexAccessor("TEXCOORD_0")?.AsVector2Array();
_Joints0 = srcPrim.GetVertexAccessor("JOINTS_0")?.AsVector4Array();
_Joints1 = srcPrim.GetVertexAccessor("JOINTS_1")?.AsVector4Array();
_Weights0 = srcPrim.GetVertexAccessor("WEIGHTS_0")?.AsVector4Array();
_Weights1 = srcPrim.GetVertexAccessor("WEIGHTS_1")?.AsVector4Array();
if (_Joints0 == null || _Weights0 == null)
{
_Joints0 = _Joints1 = _Weights0 = _Weights1 = null;
}
if (_Joints1 == null || _Weights1 == null)
{
_Joints1 = _Weights1 = null;
}
if (_Weights0 != null)
{
_Weights0 = _Weights0.ToArray(); // isolate memory to prevent overwriting source glTF.
for (int i = 0; i < _Weights0.Count; ++i)
{
var r = XYZW.Dot(_Weights0[i], XYZW.One);
_Weights0[i] /= r;
}
}
if (doubleSided) // Monogame's effect material does not support double sided materials, so we simulate it by adding reverse faces
{
var front = srcPrim.GetTriangleIndices();
var back = front.Select(item => (item.A, item.C, item.B));
_Triangles = front.Concat(back).ToArray();
}
else
{
_Triangles = srcPrim.GetTriangleIndices().ToArray();
}
}
private void CreateMeshPart(ModelMeshPart dstPart, MeshPrimitive srcPart, MeshNormalsFallback normalsFunc, int maxBones)
{
var doubleSided = srcPart.Material?.DoubleSided ?? false;
var srcGeometry = new MeshPrimitiveReader(srcPart, doubleSided, normalsFunc);
var eff = srcGeometry.IsSkinned ? _MatFactory.UseSkinnedEffect(srcPart.Material) : _MatFactory.UseStaticEffect(srcPart.Material);
dstPart.Effect = eff;
var vb = srcGeometry.IsSkinned ? CreateVertexBuffer(srcGeometry.ToXnaSkinned()) : CreateVertexBuffer(srcGeometry.ToXnaStatic());
dstPart.VertexBuffer = vb;
dstPart.NumVertices = srcGeometry.VertexCount;
dstPart.VertexOffset = 0;
dstPart.IndexBuffer = CreateIndexBuffer(srcGeometry.TriangleIndices);
dstPart.PrimitiveCount = srcGeometry.TriangleIndices.Length;
dstPart.StartIndex = 0;
}