public Memory.IEncodedArray <Vector3> AsVector3Array()
{
if (!_Sparse.HasValue)
{
return(_MemoryAccessor.AsVector3Array());
}
return(MemoryAccessor.CreateVector3SparseArray(_MemoryAccessor, _Sparse.Value.Key, _Sparse.Value.Value));
}
public static MemoryAccessor CreateVertexMemoryAccessors <TVertex>(this IReadOnlyList <TVertex> vertices, string attributeName)
where TVertex : IVertexBuilder
{
if (vertices == null || vertices.Count == 0)
{
return(null);
}
// determine the vertex attributes from the first vertex.
var attributes = GetVertexAttributes(vertices[0], vertices.Count);
var isMorphTangent = attributeName == "MORPHTANGENT";
if (isMorphTangent)
{
attributeName = "TANGENT";
}
var attribute = attributes.FirstOrDefault(item => item.Name == attributeName);
if (attribute.Name == null)
{
return(null);
}
attribute.ByteOffset = 0;
attribute.ByteStride = 0;
if (isMorphTangent)
{
attribute.Dimensions = Schema2.DimensionType.VEC3;
}
// create a buffer
var vbuffer = new ArraySegment <byte>(new Byte[attribute.PaddedByteLength * vertices.Count]);
// fill the buffer with the vertex attributes.
var accessor = new MemoryAccessor(vbuffer, attribute);
if (isMorphTangent)
{
var columnFunc = _GetVertexBuilderAttributeFunc("MORPHTANGENT");
accessor.AsVector3Array().Fill(vertices._GetColumn <TVertex, Vector3>(columnFunc));
}
else
{
accessor.FillAccessor(vertices);
}
return(accessor);
}
private static void FillAccessor <TVertex>(this MemoryAccessor dstAccessor, IReadOnlyList <TVertex> srcVertices)
where TVertex : IVertexBuilder
{
var columnFunc = _GetVertexBuilderAttributeFunc(dstAccessor.Attribute.Name);
if (dstAccessor.Attribute.Dimensions == Schema2.DimensionType.SCALAR)
{
dstAccessor.AsScalarArray().Fill(srcVertices._GetColumn <TVertex, Single>(columnFunc));
}
if (dstAccessor.Attribute.Dimensions == Schema2.DimensionType.VEC2)
{
dstAccessor.AsVector2Array().Fill(srcVertices._GetColumn <TVertex, Vector2>(columnFunc));
}
if (dstAccessor.Attribute.Dimensions == Schema2.DimensionType.VEC3)
{
dstAccessor.AsVector3Array().Fill(srcVertices._GetColumn <TVertex, Vector3>(columnFunc));
}
if (dstAccessor.Attribute.Dimensions == Schema2.DimensionType.VEC4)
{
dstAccessor.AsVector4Array().Fill(srcVertices._GetColumn <TVertex, Vector4>(columnFunc));
}
}
