setXYZW method
Sets the x, y, z and w components of the item at the given index.
Implementation
@override
InterleavedBufferAttribute setXYZW(int index, num x, num y, num z, num w) {
index = index * data!.stride + offset;
data!.array[index + 0] = x.toDouble();
data!.array[index + 1] = y.toDouble();
data!.array[index + 2] = z.toDouble();
data!.array[index + 3] = w.toDouble();
return this;
}