@Override
public void compileFace(AttributedFace f, ItemIndex<?> index, float[] buf,
int offset) {
int[] vn = f.attribs.get(IndexedTriangleMesh.ATTR_VCOLORS);
ReadonlyTColor c = (ReadonlyTColor) index.forID(vn[0]);
c.toRGBAArray(buf, offset);
c = (ReadonlyTColor) index.forID(vn[1]);
c.toRGBAArray(buf, offset + 4);
c = (ReadonlyTColor) index.forID(vn[2]);
c.toRGBAArray(buf, offset + 8);
}