gistfile1.txt

vec3 Raytracer::getLighting(vec3 point, vec3 norm, vec3 origin, Lighting* lighting)
{
	vec3 intensity(0, 0, 0);


	auto ka = lighting->ka;
	auto intensityAmbient = lighting->ia;

	intensity = ka * intensityAmbient;

	for (vec3 pointLight : lights)
	{

		bool shadow = false;
		Ray virRay = Ray(point + .001 * norm, pointLight - point);
		for (Surface* surface : surfaces)
		{
			float t = 0;
			if (surface->findIntersect(virRay, t))
			{
				if (0 < t && t < 1)
				{
					shadow = true;
					break;
				}
			}
		}
		if (shadow)
			continue;

		vec3 L = pointLight - point;

		L.make_unit_vector();
		vec3 intensityDiffuse(1, 1, 1);
		auto kd = lighting->kd;

		auto ks = lighting->ks;
		int n = lighting->n;
		vec3 R = L - 2 * dot(L, norm) * norm;
		R.make_unit_vector();
		vec3 eye = point - origin;
		eye.make_unit_vector();

		if (dot(L, norm) > 0)
		{
			intensity = intensity + (kd * intensityDiffuse * dot(L, norm)); //diffuse light;
			intensity = intensity + (ks * intensityDiffuse * pow(max(0.0f, dot(R, eye)), n)); //specular light;
		}
	}

	return intensity;