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specular lighting

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Dmitry V. Sokolov
2019-01-20 12:17:06 +01:00
parent 9a728fff2b
commit f5ec45c254
2 changed files with 19 additions and 6 deletions
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25
tinyraytracer.cpp
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@@ -12,9 +12,11 @@ struct Light {
}; };
struct Material { struct Material {
Material(const Vec3f &color) : diffuse_color(color) {} Material(const Vec2f &a, const Vec3f &color, const float &spec) : albedo(a), diffuse_color(color), specular_exponent(spec) {}
Material() : diffuse_color() {} Material() : albedo(1,0), diffuse_color(), specular_exponent() {}
Vec2f albedo;
Vec3f diffuse_color; Vec3f diffuse_color;
float specular_exponent;
}; };
struct Sphere { struct Sphere {
@@ -38,6 +40,10 @@ struct Sphere {
} }
}; };
Vec3f reflect(const Vec3f &I, const Vec3f &N) {
return I - N*2.f*(I*N);
}
bool scene_intersect(const Vec3f &orig, const Vec3f &dir, const std::vector<Sphere> &spheres, Vec3f &hit, Vec3f &N, Material &material) { bool scene_intersect(const Vec3f &orig, const Vec3f &dir, const std::vector<Sphere> &spheres, Vec3f &hit, Vec3f &N, Material &material) {
float spheres_dist = std::numeric_limits<float>::max(); float spheres_dist = std::numeric_limits<float>::max();
for (size_t i=0; i < spheres.size(); i++) { for (size_t i=0; i < spheres.size(); i++) {
@@ -60,12 +66,14 @@ Vec3f cast_ray(const Vec3f &orig, const Vec3f &dir, const std::vector<Sphere> &s
return Vec3f(0.2, 0.7, 0.8); // background color return Vec3f(0.2, 0.7, 0.8); // background color
} }
float diffuse_light_intensity = 0; float diffuse_light_intensity = 0, specular_light_intensity = 0;
for (size_t i=0; i<lights.size(); i++) { for (size_t i=0; i<lights.size(); i++) {
Vec3f light_dir = (lights[i].position - point).normalize(); Vec3f light_dir = (lights[i].position - point).normalize();
diffuse_light_intensity += lights[i].intensity * std::max(0.f, light_dir*N); diffuse_light_intensity += lights[i].intensity * std::max(0.f, light_dir*N);
specular_light_intensity += powf(std::max(0.f, -reflect(-light_dir, N)*dir), material.specular_exponent)*lights[i].intensity;
} }
return material.diffuse_color * diffuse_light_intensity; return material.diffuse_color * diffuse_light_intensity * material.albedo[0] + Vec3f(1., 1., 1.)*specular_light_intensity * material.albedo[1];
} }
void render(const std::vector<Sphere> &spheres, const std::vector<Light> &lights) { void render(const std::vector<Sphere> &spheres, const std::vector<Light> &lights) {
@@ -88,6 +96,9 @@ void render(const std::vector<Sphere> &spheres, const std::vector<Light> &lights
ofs.open("./out.ppm"); ofs.open("./out.ppm");
ofs << "P6\n" << width << " " << height << "\n255\n"; ofs << "P6\n" << width << " " << height << "\n255\n";
for (size_t i = 0; i < height*width; ++i) { for (size_t i = 0; i < height*width; ++i) {
Vec3f &c = framebuffer[i];
float max = std::max(c[0], std::max(c[1], c[2]));
if (max>1) c = c*(1./max);
for (size_t j = 0; j<3; j++) { for (size_t j = 0; j<3; j++) {
ofs << (char)(255 * std::max(0.f, std::min(1.f, framebuffer[i][j]))); ofs << (char)(255 * std::max(0.f, std::min(1.f, framebuffer[i][j])));
} }
@@ -96,8 +107,8 @@ void render(const std::vector<Sphere> &spheres, const std::vector<Light> &lights
} }
int main() { int main() {
Material ivory(Vec3f(0.4, 0.4, 0.3)); Material ivory(Vec2f(0.6, 0.3), Vec3f(0.4, 0.4, 0.3), 50.);
Material red_rubber(Vec3f(0.3, 0.1, 0.1)); Material red_rubber(Vec2f(0.9, 0.1), Vec3f(0.3, 0.1, 0.1), 10.);
std::vector<Sphere> spheres; std::vector<Sphere> spheres;
spheres.push_back(Sphere(Vec3f(-3, 0, -16), 2, ivory)); spheres.push_back(Sphere(Vec3f(-3, 0, -16), 2, ivory));
@@ -107,6 +118,8 @@ int main() {
std::vector<Light> lights; std::vector<Light> lights;
lights.push_back(Light(Vec3f(-20, 20, 20), 1.5)); lights.push_back(Light(Vec3f(-20, 20, 20), 1.5));
lights.push_back(Light(Vec3f( 30, 50, -25), 1.8));
lights.push_back(Light(Vec3f( 30, 20, 30), 1.7));
render(spheres, lights); render(spheres, lights);