mirror of
https://github.com/cjcliffe/CubicSDR.git
synced 2024-11-27 06:08:37 -05:00
111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
//
|
|
// aabb.h
|
|
// CubicVR2
|
|
//
|
|
// Created by Charles J. Cliffe on 2013-02-22.
|
|
// Copyright (c) 2013 Charles J. Cliffe. All rights reserved.
|
|
//
|
|
|
|
#ifndef __CubicVR2__aabb__
|
|
#define __CubicVR2__aabb__
|
|
|
|
#include <iostream>
|
|
#include "vec3.h"
|
|
|
|
namespace CubicVR {
|
|
|
|
enum aabb_enum { AABB_DISJOINT, AABB_A_INSIDE_B, AABB_B_INSIDE_A, AABB_INTERSECT };
|
|
|
|
struct aabb {
|
|
vec3 min, max;
|
|
|
|
aabb(vec3 min_in, vec3 max_in) {
|
|
min=min_in;
|
|
max=max_in;
|
|
}
|
|
|
|
aabb() {
|
|
min=max=vec3(0,0,0);
|
|
}
|
|
|
|
aabb engulf(aabb aabb, vec3 point) {
|
|
if (aabb.min[0] > point[0]) {
|
|
aabb.min[0] = point[0];
|
|
}
|
|
if (aabb.min[1] > point[1]) {
|
|
aabb.min[1] = point[1];
|
|
}
|
|
if (aabb.min[2] > point[2]) {
|
|
aabb.min[2] = point[2];
|
|
}
|
|
if (aabb.max[0] < point[0]) {
|
|
aabb.max[0] = point[0];
|
|
}
|
|
if (aabb.max[1] < point[1]) {
|
|
aabb.max[1] = point[1];
|
|
}
|
|
if (aabb.max[2] < point[2]) {
|
|
aabb.max[2] = point[2];
|
|
}
|
|
return aabb;
|
|
};
|
|
|
|
static aabb reset(aabb aabb, vec3 point=vec3(0.0f,0.0f,0.0f)) {
|
|
|
|
aabb.min[0] = point[0];
|
|
aabb.min[1] = point[1];
|
|
aabb.min[2] = point[2];
|
|
aabb.max[0] = point[0];
|
|
aabb.max[1] = point[1];
|
|
aabb.max[2] = point[2];
|
|
|
|
return aabb;
|
|
};
|
|
|
|
static vec3 size(aabb aabb) {
|
|
__float x = aabb.min[0] < aabb.max[0] ? aabb.max[0] - aabb.min[0] : aabb.min[0] - aabb.max[0];
|
|
__float y = aabb.min[1] < aabb.max[1] ? aabb.max[1] - aabb.min[1] : aabb.min[1] - aabb.max[1];
|
|
__float z = aabb.min[2] < aabb.max[2] ? aabb.max[2] - aabb.min[2] : aabb.min[2] - aabb.max[2];
|
|
return vec3(x,y,z);
|
|
};
|
|
/**
|
|
Returns positive integer if intersect between A and B, 0 otherwise.
|
|
For more detailed intersect result check value:
|
|
CubicVR.enums.aabb.INTERSECT if AABBs intersect
|
|
CubicVR.enums.aabb.A_INSIDE_B if boxA is inside boxB
|
|
CubicVR.enums.aabb.B_INSIDE_A if boxB is inside boxA
|
|
CubicVR.enums.aabb.DISJOINT if AABBs are disjoint (do not intersect)
|
|
*/
|
|
aabb_enum intersects(aabb boxA, aabb boxB) {
|
|
// Disjoint
|
|
if( boxA.min[0] > boxB.max[0] || boxA.max[0] < boxB.min[0] ){
|
|
return AABB_DISJOINT;
|
|
}
|
|
if( boxA.min[1] > boxB.max[1] || boxA.max[1] < boxB.min[1] ){
|
|
return AABB_DISJOINT;
|
|
}
|
|
if( boxA.min[2] > boxB.max[2] || boxA.max[2] < boxB.min[2] ){
|
|
return AABB_DISJOINT;
|
|
}
|
|
|
|
// boxA is inside boxB.
|
|
if( boxA.min[0] >= boxB.min[0] && boxA.max[0] <= boxB.max[0] &&
|
|
boxA.min[1] >= boxB.min[1] && boxA.max[1] <= boxB.max[1] &&
|
|
boxA.min[2] >= boxB.min[2] && boxA.max[2] <= boxB.max[2]) {
|
|
return AABB_A_INSIDE_B;
|
|
}
|
|
// boxB is inside boxA.
|
|
if( boxB.min[0] >= boxA.min[0] && boxB.max[0] <= boxA.max[0] &&
|
|
boxB.min[1] >= boxA.min[1] && boxB.max[1] <= boxA.max[1] &&
|
|
boxB.min[2] >= boxA.min[2] && boxB.max[2] <= boxA.max[2]) {
|
|
return AABB_B_INSIDE_A;
|
|
}
|
|
|
|
// Otherwise AABB's intersect.
|
|
return AABB_INTERSECT;
|
|
}
|
|
};
|
|
};
|
|
|
|
#endif /* defined(__CubicVR2__aabb__) */
|