gistfile1.txt

Color Scene::TraceRay (const Ray& ray, double rIndex, int iterations) const{
    
    Color pixel = Black;
    
    Intersection intersection = Intersect(ray);
    
    if (intersection.t != -1) {
        
        pixel += ambientColor * intersection.shape->getMaterial()->getAmbient();
        
        //reflection ray
        Vector reflectionDirection = ray.direction - 2 * Dot(ray.direction, intersection.normal) * intersection.normal;
        Ray reflectedRay(intersection.location + reflectionDirection * 0.000001, reflectionDirection);
        
        for(int i = 0; i < lights.size(); i++){
            
            Vector light = *lights[i];
        
            //shadow ray
            Vector shadowDirection = light - intersection.location;
            Ray shadowRay(intersection.location + shadowDirection * 0.000001, shadowDirection);
            
            //if not in shadow
            Intersection shadowIntersection = Intersect(shadowRay);
            if (shadowIntersection.t == -1) {
                //diffuse part
                double diffuseFactor = Dot(intersection.normal, shadowRay.direction);
                if (diffuseFactor > 0)
                    pixel += lightColor * intersection.shape->getMaterial()->getDiffuse() * diffuseFactor;
                
                //specular part
                Vector R = shadowRay.direction - 2 * Dot(shadowRay.direction, intersection.normal) * intersection.normal;
                double specularFactor = Dot(ray.direction, R);
                if (specularFactor > 0) {
                    pixel += lightColor * intersection.shape->getMaterial()->getSpecular() * pow(specularFactor, intersection.shape->getMaterial()->getShininess());
                }

            }
        }
        
        if (intersection.shape->getMaterial()->getReflection() > 0 && iterations > 0) {
            pixel += intersection.shape->getMaterial()->getSpecular() * TraceRay(reflectedRay, intersection.shape->getMaterial()->getRefraction(), --iterations) * intersection.shape->getMaterial()->getReflection();
        }
        
    }
    else
        pixel += backgroundColor;
    return pixel;
//MASTER ALGORITHM HERE!
}