brightness of vertices 1 and 3 differ less than
the brightness of vertices 0 and 2.
*/
- if (abs(f.vertices[0].Color.getAverage()
- - f.vertices[2].Color.getAverage())
- > abs(f.vertices[1].Color.getAverage()
- - f.vertices[3].Color.getAverage()))
+ if (abs(f.vertices[0].Color.getLuminance()
+ - f.vertices[2].Color.getLuminance())
+ > abs(f.vertices[1].Color.getLuminance()
+ - f.vertices[3].Color.getLuminance()))
indices_p = indices_alternate;
collector.append(f.tile, f.vertices, 4, indices_p, 6);