#if 0
//This function is the most intuitive--it samples a red photon.  Note that the ray is NOT attenuated on any bounce!
float3 radiance(const Ray* ray, const Scene* scene, uint2* rvec) {
    HitRecord hits_camera[N];
    int max_depth = generate_path(ray,N, scene,rvec, hits_camera,NULL); //generate a random path; each ray is generated from a cosine-weighted distribution

    float3 accumulated = (float3)(0.0f,0.0f,0.0f);
    for (int i=0;i<max_depth;++i) {
        const HitRecord* hit = hits_camera + i;

        accumulated += hit->material->color_emission;

        //Terminate ray
        if (rand_float(rvec)>hit->material->color_diffuse.x) break; //terminate based on red
    }

    return accumulated;
}
#else
//This samples red, green, and blue.
float3 radiance(const Ray* ray, const Scene* scene, uint2* rvec) {
    HitRecord hits_camera[N];
    int max_depth = generate_path(ray,N, scene,rvec, hits_camera,NULL); //generate a random path; each ray is generated from a cosine-weighted distribution
    float3 accumulated = (float3)(0.0f,0.0f,0.0f);
    float3 mask = (float3)(1.0f,1.0f,1.0f);
    for (int i=0;i<max_depth;++i) {
        const HitRecord* hit = hits_camera + i;
        accumulated += mask * hit->material->color_emission;

        //Terminate ray (if not multiply by a normalized color, so as not to attenuate the ray's intensity)
        float3 f = hit->material->color_diffuse;
        float p_reflect = (f.x + f.y + f.z)/3.0f;
        if (rand_float(rvec)>p_reflect) break;
        f /= p_reflect;
        mask *= f;
    }

    return accumulated;
}
#endif[