public static T[] GetArrayFromAccessor <T>(this glTF self, int accessorIndex) where T : struct
{
var vertexAccessor = self.accessors[accessorIndex];
if (vertexAccessor.count <= 0)
{
return new T[] { }
}
;
var result = (vertexAccessor.bufferView != -1)
? self.GetAttrib <T>(vertexAccessor, self.bufferViews[vertexAccessor.bufferView])
: new T[vertexAccessor.count]
;
var sparse = vertexAccessor.sparse;
if (sparse != null && sparse.count > 0)
{
// override sparse values
var indices = self._GetIndices(self.bufferViews[sparse.indices.bufferView], sparse.count, sparse.indices.byteOffset, sparse.indices.componentType);
var values = self.GetAttrib <T>(sparse.count, sparse.values.byteOffset, self.bufferViews[sparse.values.bufferView]);
var it = indices.GetEnumerator();
for (int i = 0; i < sparse.count; ++i)
{
it.MoveNext();
result[it.Current] = values[i];
}
}
return(result);
}
public static float[] FlatternFloatArrayFromAccessor(this glTF self, int accessorIndex)
{
var vertexAccessor = self.accessors[accessorIndex];
if (vertexAccessor.count <= 0)
{
return new float[] { }
}
;
var bufferCount = vertexAccessor.count * vertexAccessor.TypeCount;
float[] result = null;
if (vertexAccessor.bufferView != -1)
{
var attrib = new float[vertexAccessor.count * vertexAccessor.TypeCount];
var view = self.bufferViews[vertexAccessor.bufferView];
var segment = self.buffers[view.buffer].GetBytes();
var bytes = new ArraySegment <Byte>(segment.Array, segment.Offset + view.byteOffset + vertexAccessor.byteOffset, vertexAccessor.count * view.byteStride);
bytes.MarshalCopyTo(attrib);
result = attrib;
}
else
{
result = new float[bufferCount];
}
var sparse = vertexAccessor.sparse;
if (sparse != null && sparse.count > 0)
{
// override sparse values
var indices = self._GetIndices(self.bufferViews[sparse.indices.bufferView], sparse.count, sparse.indices.byteOffset, sparse.indices.componentType);
var values = self.GetAttrib <float>(sparse.count * vertexAccessor.TypeCount, sparse.values.byteOffset, self.bufferViews[sparse.values.bufferView]);
var it = indices.GetEnumerator();
for (int i = 0; i < sparse.count; ++i)
{
it.MoveNext();
result[it.Current] = values[i];
}
}
return(result);
}
public static int[] GetIndices(this glTF self, int accessorIndex)
{
int count;
var result = self._GetIndices(self.accessors[accessorIndex], out count);
var indices = new int[count];
// flip triangles
var it = result.GetEnumerator();
{
for (int i = 0; i < count; i += 3)
{
it.MoveNext(); indices[i + 2] = it.Current;
it.MoveNext(); indices[i + 1] = it.Current;
it.MoveNext(); indices[i] = it.Current;
}
}
return(indices);
}
