int index_0 = int( ((packed_index >> 2u) & 0x3ffu) * 3u );
int index_1 = int( ((packed_index >> 12u) & 0x3ffu) * 3u );
int index_2 = int( ((packed_index >> 22u) & 0x3ffu) * 3u );
l += scene_calculate_light( index_0, halfview, co, normal );
int index_0 = int( ((packed_index >> 2u) & 0x3ffu) * 3u );
int index_1 = int( ((packed_index >> 12u) & 0x3ffu) * 3u );
int index_2 = int( ((packed_index >> 22u) & 0x3ffu) * 3u );
l += scene_calculate_light( index_0, halfview, co, normal );