127 lines
5.5 KiB
C++
127 lines
5.5 KiB
C++
/*
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* Created by Brett Terpstra 6920201 on 17/10/22.
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* Copyright (c) 2022 Brett Terpstra. All Rights Reserved.
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*/
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#ifndef STEP_2_COLLIDERS_H
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#define STEP_2_COLLIDERS_H
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#include "vectors.h"
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namespace Raytracing {
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// 3D Axis Aligned Bounding Box for use in a BVH
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class AABB {
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protected:
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Vec4 min;
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Vec4 max;
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public:
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AABB(): min({0,0,0}), max({0,0,0}) {};
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AABB(PRECISION_TYPE minX, PRECISION_TYPE minY, PRECISION_TYPE minZ, PRECISION_TYPE maxX, PRECISION_TYPE maxY, PRECISION_TYPE maxZ):
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min{minX, minY, minZ}, max{maxX, maxY, maxZ} {
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}
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AABB(const Vec4& min, const Vec4& max): min(min), max(max) {}
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// creates an AABB extending of size centered on x, y, z
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AABB(PRECISION_TYPE x, PRECISION_TYPE y, PRECISION_TYPE z, PRECISION_TYPE size):
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min{x - size, y - size, z - size}, max{x + size, y + size, z + size} {
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}
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// translates the AABB to position x,y,z for world collision detection
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[[nodiscard]] AABB translate(PRECISION_TYPE x, PRECISION_TYPE y, PRECISION_TYPE z) const {
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Vec4 pos = {x, y, z};
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return {min + pos, max + pos};
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}
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[[nodiscard]] AABB translate(const Vec4& vec) const {
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Vec4 pos = {vec.x(), vec.y(), vec.z()};
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return {min + pos, max + pos};
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}
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// returns an expanded version of this AABB is the other AABB is larger then this AABB
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[[nodiscard]] AABB expand(const AABB& other) const {
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PRECISION_TYPE minX = std::min(min.x(), other.min.x());
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PRECISION_TYPE minY = std::min(min.y(), other.min.y());
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PRECISION_TYPE minZ = std::min(min.z(), other.min.z());
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PRECISION_TYPE maxX = std::max(max.x(), other.max.x());
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PRECISION_TYPE maxY = std::max(max.y(), other.max.y());
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PRECISION_TYPE maxZ = std::max(max.z(), other.max.z());
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return {minX, minY, minZ, maxX, maxY, maxZ};
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}
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[[nodiscard]] inline bool
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intersects(PRECISION_TYPE minX, PRECISION_TYPE minY, PRECISION_TYPE minZ, PRECISION_TYPE maxX, PRECISION_TYPE maxY,
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PRECISION_TYPE maxZ) const {
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return min.x() <= maxX && max.x() >= minX && min.y() <= maxY && max.y() >= minY && min.z() <= maxZ && max.z() >= minZ;
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}
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[[nodiscard]] inline bool intersects(const Vec4& minV, const Vec4& maxV) const {
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return intersects(minV.x(), minV.y(), minV.z(), maxV.x(), maxV.y(), maxV.z());
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}
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[[nodiscard]] inline bool intersects(const AABB& other) const {
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return intersects(other.min, other.max);
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}
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bool intersects(const Ray& ray, PRECISION_TYPE tmin, PRECISION_TYPE tmax);
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bool simpleSlabRayAABBMethod(const Ray& ray, PRECISION_TYPE tmin, PRECISION_TYPE tmax);
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[[nodiscard]] inline bool isInside(PRECISION_TYPE x, PRECISION_TYPE y, PRECISION_TYPE z) const {
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return x >= min.x() && x <= max.x() && y >= min.y() && y <= max.y() && z >= min.z() && z <= max.z();
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}
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[[nodiscard]] inline bool intersectsWithYZ(PRECISION_TYPE y, PRECISION_TYPE z) const {
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return y >= min.y() && y <= max.y() && z >= min.z() && z <= max.z();
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}
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[[nodiscard]] inline bool intersectsWithXZ(PRECISION_TYPE x, PRECISION_TYPE z) const {
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return x >= min.x() && x <= max.x() && z >= min.z() && z <= max.z();
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}
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[[nodiscard]] inline bool intersectsWithXY(PRECISION_TYPE x, PRECISION_TYPE y) const {
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return x >= min.x() && x <= max.x() && y >= min.y() && y <= max.y();
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}
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[[nodiscard]] inline Vec4 getCenter() const {
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return {min.x() + (max.x() - min.x()) * 0.5, min.y() + (max.y() - min.y()) * 0.5, min.z() + (max.z() - min.z()) * 0.5};
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}
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[[nodiscard]] PRECISION_TYPE longestDistanceFromCenter() const;
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// 0 - x
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// 1 - y
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// 2 - z
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[[nodiscard]] int longestAxis() const;
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[[nodiscard]] PRECISION_TYPE longestAxisLength() const;
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[[nodiscard]] std::pair<AABB, AABB> splitByLongestAxis();
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[[nodiscard]] PRECISION_TYPE avgDistanceFromCenter() const;
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// Returns true if the min and max are equal, which tells us this AABB wasn't assigned
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// or was properly created. Either way it isn't responsible to use the AABB in said case.
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[[nodiscard]] inline bool isEmpty() const { return min == max; }
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[[nodiscard]] Vec4 getMin() const { return min; }
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[[nodiscard]] Vec4 getMax() const { return max; }
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inline PRECISION_TYPE getXRadius(const Vec4& center){
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return max.x() - center.x();
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}
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inline PRECISION_TYPE getYRadius(const Vec4& center){
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return max.y() - center.y();
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}
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inline PRECISION_TYPE getZRadius(const Vec4& center){
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return max.z() - center.z();
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}
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};
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inline std::ostream& operator<<(std::ostream& out, const AABB& v) {
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return out << "AABB{min{" << v.getMin().x() << ", " << v.getMin().y() << ", " << v.getMin().z() << "}, max{" << v.getMax().x() << ", " << v.getMax().y()
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<< ", " << v.getMax().z() << "}} ";
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}
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}
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#endif //STEP_2_COLLIDERS_H
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