closest_hit.cu

RT_PROGRAM void closest_hit_radiance1() {
    float3 world_geo_normal = normalize(rtTransformNormal( RT_OBJECT_TO_WORLD, geometric_normal));
    float3 world_shade_normal = normalize(rtTransformNormal( RT_OBJECT_TO_WORLD, shading_normal)); 
    float3 ffnormal = faceforward(world_shade_normal,
                                  -ray.direction,
                                  world_geo_normal);
    float3 color = Ka * ambient_light_color;
    float3 hit_point = ray.origin + t_hit * ray.direction;
    for(int i = 0; i < lights.size(); ++i) {
       BasicLight light = lights[i];
       float3 L = normalize(light.pos - hit_point); float nDl = dot( ffnormal, L);
       if( nDl > 0 )
          color += Kd * nDl * light.color;
    }
    prd_radiance.result = color;
}