1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
Minetest
Copyright (C) 2016 juhdanad, Daniel Juhasz <juhdanad@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "irr_v3d.h"
#include "irr_aabb3d.h"
bool boxLineCollision(const aabb3f &box, const v3f &start,
const v3f &dir, v3f *collision_point, v3s16 *collision_normal) {
if (box.isPointInside(start)) {
*collision_point = start;
collision_normal->set(0, 0, 0);
return true;
}
float m = 0;
// Test X collision
if (dir.X != 0) {
if (dir.X > 0)
m = (box.MinEdge.X - start.X) / dir.X;
else
m = (box.MaxEdge.X - start.X) / dir.X;
if (m >= 0 && m <= 1) {
*collision_point = start + dir * m;
if ((collision_point->Y >= box.MinEdge.Y)
&& (collision_point->Y <= box.MaxEdge.Y)
&& (collision_point->Z >= box.MinEdge.Z)
&& (collision_point->Z <= box.MaxEdge.Z)) {
collision_normal->set((dir.X > 0) ? -1 : 1, 0, 0);
return true;
}
}
}
// Test Y collision
if (dir.Y != 0) {
if (dir.Y > 0)
m = (box.MinEdge.Y - start.Y) / dir.Y;
else
m = (box.MaxEdge.Y - start.Y) / dir.Y;
if (m >= 0 && m <= 1) {
*collision_point = start + dir * m;
if ((collision_point->X >= box.MinEdge.X)
&& (collision_point->X <= box.MaxEdge.X)
&& (collision_point->Z >= box.MinEdge.Z)
&& (collision_point->Z <= box.MaxEdge.Z)) {
collision_normal->set(0, (dir.Y > 0) ? -1 : 1, 0);
return true;
}
}
}
// Test Z collision
if (dir.Z != 0) {
if (dir.Z > 0)
m = (box.MinEdge.Z - start.Z) / dir.Z;
else
m = (box.MaxEdge.Z - start.Z) / dir.Z;
if (m >= 0 && m <= 1) {
*collision_point = start + dir * m;
if ((collision_point->X >= box.MinEdge.X)
&& (collision_point->X <= box.MaxEdge.X)
&& (collision_point->Y >= box.MinEdge.Y)
&& (collision_point->Y <= box.MaxEdge.Y)) {
collision_normal->set(0, 0, (dir.Z > 0) ? -1 : 1);
return true;
}
}
}
return false;
}
|
