public static VertexBufferColumns GetVertexColumns(this MeshPrimitive primitive)
{
Guard.NotNull(primitive, nameof(primitive));
var columns = new VertexBufferColumns();
_Initialize(primitive.VertexAccessors, columns);
for (int i = 0; i < primitive.MorphTargetsCount; ++i)
{
var morphTarget = primitive.GetMorphTargetAccessors(i);
_Initialize(morphTarget, columns.AddMorphTarget());
}
return(columns);
}
private static IReadOnlyList <(Material Material, VertexBufferColumns Vertices, IEnumerable <(int, int, int)> Triangles)> _GatherMeshGeometry(Mesh mesh)
{
var primitives = mesh.Primitives
.Where(prim => prim.GetTriangleIndices().Any())
.Select(prim => (prim.Material, prim.GetVertexColumns(), (IEnumerable <(int, int, int)>)prim.GetTriangleIndices().ToList()))
.ToList();
bool needsNormals = default(TvG).TryGetNormal(out Vector3 nrm);
bool needsTangents = default(TvG).TryGetTangent(out Vector4 tgt);
if (needsNormals)
{
var prims = primitives
.Where(p => p.Item2.Normals == null)
.Select(p => (p.Item2, p.Item3))
.ToList();
if (prims.Any())
{
VertexBufferColumns.CalculateSmoothNormals(prims);
}
}
if (needsTangents)
{
var prims = primitives
.Where(p => p.Item2.Tangents == null && p.Item2.TexCoords0 != null)
.Select(p => (p.Item2, p.Item3))
.ToList();
if (prims.Any())
{
VertexBufferColumns.CalculateTangents(prims);
}
}
return(primitives);
}
private static IEnumerable <EvaluatedTriangle <TvG, TvM, TvS> > _EvaluateTriangles(Material material, VertexBufferColumns vertices, IEnumerable <(int A, int B, int C)> indices)
public _NormalTangentAgent(VertexBufferColumns vertices, IEnumerable <(int A, int B, int C)> indices)
private static void _Initialize(IReadOnlyDictionary <string, Accessor> vertexAccessors, VertexBufferColumns dstColumns)
{
if (vertexAccessors.ContainsKey("POSITION"))
{
dstColumns.Positions = vertexAccessors["POSITION"].AsVector3Array();
}
if (vertexAccessors.ContainsKey("NORMAL"))
{
dstColumns.Normals = vertexAccessors["NORMAL"].AsVector3Array();
}
if (vertexAccessors.ContainsKey("TANGENT"))
{
dstColumns.Tangents = vertexAccessors["TANGENT"].AsColorArray(0);
}
if (vertexAccessors.ContainsKey("COLOR_0"))
{
dstColumns.Colors0 = vertexAccessors["COLOR_0"].AsColorArray(1);
}
if (vertexAccessors.ContainsKey("COLOR_1"))
{
dstColumns.Colors1 = vertexAccessors["COLOR_1"].AsColorArray(1);
}
if (vertexAccessors.ContainsKey("TEXCOORD_0"))
{
dstColumns.TexCoords0 = vertexAccessors["TEXCOORD_0"].AsVector2Array();
}
if (vertexAccessors.ContainsKey("TEXCOORD_1"))
{
dstColumns.TexCoords1 = vertexAccessors["TEXCOORD_1"].AsVector2Array();
}
if (vertexAccessors.ContainsKey("TEXCOORD_2"))
{
dstColumns.TexCoords2 = vertexAccessors["TEXCOORD_2"].AsVector2Array();
}
if (vertexAccessors.ContainsKey("TEXCOORD_3"))
{
dstColumns.TexCoords3 = vertexAccessors["TEXCOORD_3"].AsVector2Array();
}
if (vertexAccessors.ContainsKey("JOINTS_0"))
{
dstColumns.Joints0 = vertexAccessors["JOINTS_0"].AsVector4Array();
}
if (vertexAccessors.ContainsKey("JOINTS_1"))
{
dstColumns.Joints1 = vertexAccessors["JOINTS_1"].AsVector4Array();
}
if (vertexAccessors.ContainsKey("WEIGHTS_0"))
{
dstColumns.Weights0 = vertexAccessors["WEIGHTS_0"].AsVector4Array();
}
if (vertexAccessors.ContainsKey("WEIGHTS_1"))
{
dstColumns.Weights1 = vertexAccessors["WEIGHTS_1"].AsVector4Array();
}
}
