-#if 0
-VG_STATIC float colour_luminance( v3f v )
-{
- return v3_dot( v, (v3f){0.2126f, 0.7152f, 0.0722f} );
-}
-
-VG_STATIC float calc_light_influence( world_instance *world, v3f position,
- int light )
-{
- struct world_light *world_light = &world->lights[ light ];
- struct classtype_world_light *inf = world_light->inf;
-
- v3f light_delta;
- v3_sub( world_light->node->co, position, light_delta );
- v3_muls( light_delta, 10.0f, light_delta );
-
- float quadratic = v3_dot( light_delta, light_delta ),
- attenuation = 1.0f/( 1.0f + quadratic );
-
- float quadratic_light = attenuation * colour_luminance( inf->colour );
-
- if( (inf->type == k_light_type_point) ||
- (inf->type == k_light_type_point_nighttime_only) )
- {
- return quadratic_light;
- }
- else if( (inf->type == k_light_type_spot) ||
- (inf->type == k_light_type_spot_nighttime_only) )
- {
- v3f dir;
- q_mulv( world_light->node->q, (v3f){0.0f,1.0f,0.0f}, dir );
-
- float spot_theta = vg_maxf( 0.0f, v3_dot( light_delta, dir ) ),
- falloff = spot_theta >= 0.0f? 1.0f: 0.0f;
-
- return quadratic_light * falloff;
- }
- else
- return 0.0f;
-}
-#endif
-