frustum.h
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frustum.h
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	#pragma once
	#include "plane.h"
	#include "line3d.h"
	#include "aabbox.h"

	struct frustum {
	//Planes are: Near, Left, Right, Top, Bottom, Far
	planed planes[6];
	AABBoxd bound;

	frustum() {}

	frustum(const line3dd& topLeft, const line3dd& topRight, const line3dd& botLeft, const line3dd& botRight) {
	planes[0] = planed(topLeft.start, botLeft.start, topRight.start);
	planes[1] = planed(topLeft.start, topLeft.end, botLeft.start);
	planes[2] = planed(topRight.end, topRight.start, botRight.start);
	planes[3] = planed(topLeft.start, topRight.start, topRight.end);
	planes[4] = planed(botRight.start, botLeft.start, botRight.end);
	planes[5] = planed(topLeft.end, topRight.end, botLeft.end);

	bound.reset(topLeft);
	bound.addLine(topRight);
	bound.addLine(botLeft);
	bound.addLine(botRight);
	}

	void operator=(const frustum& other) {
	memcpy(this, &other, sizeof(frustum));
	}

	bool overlaps(const vec3d& center, double radius) const {
	for(unsigned i = 0; i < 6; ++i)
	if(planes[i].distanceFromPlane(center) <= -radius)
	return false;
	return true;
	}
	};