Color Lambert::shade(const Ray& ray, const IntersectionInfo& info)
{
Color diffuse = texture ? texture->sample(info) : this->color;
Vector v1 = info.normal;
Vector v2 = lightPos - info.ip;
v2.normalize();
double lambertCoeff = dot(v1, v2);
return ambientLight * diffuse
+ diffuse * lambertCoeff * getLightContrib(info);
}
Color Phong::shade(const Ray& ray, const IntersectionInfo& info)
{
Color diffuse = texture ? texture->sample(info) : this->color;
Color result(0, 0, 0);
for (auto& light: scene.lights) {
int N = 1;
Color sum (0, 0, 0);
for (int i = 0; i < 1; i++) {
Vector lightPos;
Color lightColor;
light->getNthSample(i, info.ip, lightPos, lightColor);
Vector v2 = info.ip - lightPos; // from light towards the intersection point
Vector v1 = faceforward(ray.dir, info.normal); // orient so that surface points to the light
v2.normalize();
double lambertCoeff = dot(v1, -v2);
Color fromLight = getLightContrib(info, lightPos, lightColor);
Vector r = reflect(v2, v1);
Vector toCamera = -ray.dir;
double cosGamma = dot(toCamera, r);
double phongCoeff;
if (cosGamma > 0)
phongCoeff = pow(cosGamma, specularExponent);
else
phongCoeff = 0;
sum += diffuse * lambertCoeff * fromLight
+ (phongCoeff * specularMultiplier * fromLight);
}
result += sum / N;
}
result += scene.settings.ambientLight * diffuse;
return result;
}
Color Phong::shade(const Ray& ray, const IntersectionInfo& info)
{
Color diffuse = texture ? texture->sample(info) : this->color;
Vector v1 = info.normal;
Vector v2 = lightPos - info.ip;
v2.normalize();
double lambertCoeff = dot(v1, v2);
double fromLight = getLightContrib(info);
Vector r = reflect(info.ip - lightPos, info.normal);
Vector toCamera = -ray.dir;
double cosGamma = dot(toCamera, r);
double phongCoeff;
if (cosGamma > 0)
phongCoeff = pow(cosGamma, specularExponent);
else
phongCoeff = 0;
return ambientLight * diffuse
+ diffuse * lambertCoeff * fromLight
+ Color(1, 1, 1) * (phongCoeff * specularMultiplier * fromLight);
}
Color Lambert::shade(const Ray& ray, const IntersectionInfo& info)
{
Color diffuse = texture ? texture->sample(info) : this->color;
Color result(0, 0, 0);
for (auto& light: scene.lights) {
int N = light->getNumSamples();
Color sum (0, 0, 0);
for (int i = 0; i < 1; i++) {
Vector lightPos;
Color lightColor;
light->getNthSample(i, info.ip, lightPos, lightColor);
Vector v2 = info.ip - lightPos; // from light towards the intersection point
Vector v1 = faceforward(ray.dir, info.normal); // orient so that surface points to the light
v2.normalize();
double lambertCoeff = dot(v1, -v2);
sum += diffuse * lambertCoeff * getLightContrib(info, lightPos, lightColor);
}
result += sum / N;
}
result += scene.settings.ambientLight * diffuse;
return result;
}
