110 lines
4.0 KiB
C
110 lines
4.0 KiB
C
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/*
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* Created by Brett Terpstra 6920201 on 16/10/22.
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* Copyright (c) 2022 Brett Terpstra. All Rights Reserved.
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*
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* The general class for all things raytracing!
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*/
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#ifndef STEP_2_RAYTRACING_H
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#define STEP_2_RAYTRACING_H
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#include <math/vectors.h>
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#include <image/image.h>
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#include <util/parser.h>
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#include <world.h>
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#include <utility>
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namespace Raytracing {
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class Camera {
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private:
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/* Image details */
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const Image image;
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const PRECISION_TYPE aspectRatio;
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/* Camera details */
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PRECISION_TYPE viewportHeight;
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PRECISION_TYPE viewportWidth;
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PRECISION_TYPE focalLength = 1.0;
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Vec4 position{0, 0, 0};
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Vec4 horizontalAxis;
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Vec4 verticalAxis;
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Vec4 imageOrigin;
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public:
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Camera(PRECISION_TYPE fov, const Image& image): image(image),
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aspectRatio(double(image.getWidth()) / double(image.getHeight())) {
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// scale the viewport height based on the camera's FOV
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viewportHeight = (2.0 * tan(degreeeToRadian(fov) / 2));
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// with must respect the aspect ratio of the image, otherwise we'd get funky results
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viewportWidth = (aspectRatio * viewportHeight);
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// horizontal direction from the camera. used to translate the camera
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horizontalAxis = (Vec4{viewportWidth, 0, 0, 0});
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// virtual direction, also used to translate the camera
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verticalAxis = (Vec4{0, viewportHeight, 0, 0});
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// lower left of the camera's view port. used to project our vectors from image space to world space
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imageOrigin = (position - horizontalAxis / 2 - verticalAxis / 2 - Vec4(0, 0, focalLength, 0));
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tlog << viewportHeight << "\n";
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tlog << viewportWidth << "\n";
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tlog << "\n";
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tlog << horizontalAxis << "\n";
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tlog << verticalAxis << "\n";
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tlog << imageOrigin << "\n";
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}
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Ray projectRay(PRECISION_TYPE x, PRECISION_TYPE y);
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// makes the camera look at the lookatpos from the position p, with respects to the up direction up. (set to 0,1,0)
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void lookAt(const Vec4& pos, const Vec4& lookAtPos, const Vec4& up);
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void setPosition(const Vec4& pos) { this->position = pos; }
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void setRotation(PRECISION_TYPE yaw, PRECISION_TYPE pitch, PRECISION_TYPE roll);
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};
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static Random rnd{-1, 1};
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class Raycaster {
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private:
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const int maxBounceDepth = 50;
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// 50 seems to be the magic number for the point of diminishing returns
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// 100 looks like 50 but slightly clearer
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// 25 is noisy
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// 1 is VERY noisy.
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const int raysPerPixel = 50;
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Camera& camera;
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Image& image;
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World& world;
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Vec4 raycast(const Ray& ray, int depth);
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public:
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inline static Vec4 randomUnitVector() {
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// there are two methods to generating a random unit sphere
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// one which is fast and approximate:
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auto v = Vec4(rnd.getDouble(), rnd.getDouble(), rnd.getDouble());
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return v.normalize();
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// and the one which generates an actual unit vector
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/*while (true) {
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auto v = Vec4(rnd.getDouble(), rnd.getDouble(), rnd.getDouble());
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if (v.lengthSquared() >= 1)
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continue;
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return v;
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}*/
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// the second creates better results but is 18% slower (better defined shadows)
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// likely due to not over generating unit vectors biased towards the corners
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}
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Raycaster(Camera& c, Image& i, World& world, const Parser& p): camera(c), image(i), world(world) {
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world.generateBVH();
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}
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void run();
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};
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}
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#endif //STEP_2_RAYTRACING_H
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