shooter/engine/physics/HitBox.cpp

77 lines
2.1 KiB
C++

//
// Created by Иван Ильин on 04.11.2021.
//
#include <algorithm>
#include "HitBox.h"
HitBox::HitBox(const Mesh &mesh) {
_hitBox.reserve(mesh.triangles().size() * 3);
for(const auto& t : mesh.triangles()) {
for(int i = 0; i < 3; i++) {
// we dont need to add the same points in hit box
_addIfUnique(Vec3D(t[i]));
}
}
_hitBox.shrink_to_fit();
}
void HitBox::_addIfUnique(Vec3D &&point) {
auto check = [&point](const auto& p) { return p == point; };
if (std::find_if(_hitBox.rbegin(), _hitBox.rend(), check) == _hitBox.rend()) {
_hitBox.push_back(point);
}
}
HitBox HitBox::Box(const Mesh &mesh) {
HitBox result;
double maxX = -std::numeric_limits<double>::max();
double maxY = -std::numeric_limits<double>::max();
double maxZ = -std::numeric_limits<double>::max();
double minX = std::numeric_limits<double>::max();
double minY = std::numeric_limits<double>::max();
double minZ = std::numeric_limits<double>::max();
for(const auto& t : mesh.triangles()) {
for(int i = 0; i < 3; i++) {
auto point = Vec3D(t[i]);
if(point.x() > maxX) {
maxX = point.x();
}
if(point.y() > maxY) {
maxY = point.y();
}
if(point.z() > maxZ) {
maxZ = point.z();
}
if(point.x() < minX) {
minX = point.x();
}
if(point.y() < minY) {
minY = point.y();
}
if(point.z() < minZ) {
minZ = point.z();
}
}
}
result._hitBox.emplace_back(minX, minY, minZ);
result._hitBox.emplace_back(minX, maxY, minZ);
result._hitBox.emplace_back(maxX, minY, minZ);
result._hitBox.emplace_back(maxX, maxY, minZ);
result._hitBox.emplace_back(minX, minY, maxZ);
result._hitBox.emplace_back(minX, maxY, maxZ);
result._hitBox.emplace_back(maxX, minY, maxZ);
result._hitBox.emplace_back(maxX, maxY, maxZ);
return result;
}