ray-tracer-comp371/src/Parser.cc

131 lines
3.8 KiB
C++

#include "Parser.h"
#include "Geometry.h"
#include "Light.h"
#include <Eigen/Core>
#include <string>
using Eigen::Vector3f;
using Eigen::VectorXi;
using std::string;
// a helper function to get Vector3f
const Vector3f getVector3f(const nlohmann::json &j) {
return Vector3f(j[0].get<float>(), j[1].get<float>(), j[2].get<float>());
}
// A helper function to get raysperpixel array
const VectorXi getRpp(const nlohmann::json &j) {
VectorXi rpp(j.size());
for (int i = 0; i < j.size(); ++i) {
rpp[i] = j[i].get<int>();
}
return rpp;
}
Scene *Parser::getScene(const nlohmann::json &j) {
string name = j["filename"].get<string>();
int width = j["size"][0].get<int>();
int height = j["size"][1].get<int>();
float fov = j["fov"].get<float>();
Vector3f lookAt = getVector3f(j["lookat"]);
Vector3f up = getVector3f(j["up"]);
Vector3f center = getVector3f(j["centre"]);
Vector3f ai = getVector3f(j["ai"]);
Vector3f bgc = getVector3f(j["bkc"]);
Scene *sc = new Scene(name, width, height, fov, center, up, lookAt, ai, bgc);
sc->setAntialiasing(j.value("antialiasing", false));
sc->setTwoSideRender(j.value("twosiderender", false));
sc->setGlobalIllum(j.value("globalillum", false));
if (j.contains("raysperpixel"))
sc->setRaysPerPixel(getRpp(j["raysperpixel"]));
return sc;
}
// TODO: Get Matrix4f transform for geometries and lights
const Matrix4f getTransform(const nlohmann::json &j) { return Matrix4f(); }
Geometry *Parser::getGeometry(const nlohmann::json &j) {
float ka = j["ka"].get<float>();
float kd = j["kd"].get<float>();
float ks = j["ks"].get<float>();
Vector3f ca = getVector3f(j["ac"]);
Vector3f cd = getVector3f(j["dc"]);
Vector3f cs = getVector3f(j["sc"]);
float phong = j["pc"].get<float>();
Geometry *g;
if (j["type"].get<string>().compare("rectangle"))
g = getSphere(j, ka, kd, ks, ca, cd, cs, phong);
else
g = getRectangle(j, ka, kd, ks, ca, cd, cs, phong);
if (j.contains("transform")) {
g->setTransform(getTransform(j["transform"]));
}
return g;
}
Sphere *Parser::getSphere(const nlohmann::json &j, float ka, float kd, float ks,
const Vector3f &ca, const Vector3f &cd,
const Vector3f &cs, float pc) {
float radius = j["radius"].get<float>();
Vector3f center = getVector3f(j["centre"]);
return new Sphere(ka, kd, ks, ca, cd, cs, pc, radius, center);
}
Rectangle *Parser::getRectangle(const nlohmann::json &j, float ka, float kd,
float ks, const Vector3f &ca,
const Vector3f &cd, const Vector3f &cs,
float pc) {
Vector3f p1 = getVector3f(j["p1"]);
Vector3f p2 = getVector3f(j["p2"]);
Vector3f p3 = getVector3f(j["p3"]);
Vector3f p4 = getVector3f(j["p4"]);
return new Rectangle(ka, kd, ks, ca, cd, cs, pc, p1, p2, p3, p4);
}
Light *Parser::getLight(const nlohmann::json &j) {
Vector3f id = getVector3f(j["id"]);
Vector3f is = getVector3f(j["is"]);
Light *l;
if (j["type"].get<string>().compare("point"))
l = getAreaLight(j, id, is);
else
l = getPointLight(j, id, is);
if (j.contains("transform")) {
l->setTransform(getTransform(j["transform"]));
}
l->setGridSize(j.value("n", 0));
l->setUseCenter(j.value("usecenter", false));
return l;
}
AreaLight *Parser::getAreaLight(const nlohmann::json &j, const Vector3f &id,
const Vector3f &is) {
Vector3f p1 = getVector3f(j["p1"]);
Vector3f p2 = getVector3f(j["p2"]);
Vector3f p3 = getVector3f(j["p3"]);
Vector3f p4 = getVector3f(j["p4"]);
return new AreaLight(id, is, p1, p2, p3, p4);
}
PointLight *Parser::getPointLight(const nlohmann::json &j, const Vector3f &id,
const Vector3f &is) {
Vector3f center = getVector3f(j["centre"]);
return new PointLight(id, is, center);
}