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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/*
* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
*/
package net.java.joglutils.msg.math;
/** Represents a plane in 3D space. */
public class Plane {
/** Normalized */
private Vec3f normal;
private Vec3f point;
/** Constant for faster projection and intersection */
float c;
/** Default constructor initializes normal to (0, 1, 0) and point to
(0, 0, 0) */
public Plane() {
normal = new Vec3f(0, 1, 0);
point = new Vec3f(0, 0, 0);
recalc();
}
/** Sets all parameters of plane. Plane has normal <b>normal</b> and
goes through the point <b>point</b>. Normal does not need to be
unit length but must not be the zero vector. */
public Plane(Vec3f normal, Vec3f point) {
this.normal = new Vec3f(normal);
this.normal.normalize();
this.point = new Vec3f(point);
recalc();
}
/** Setter does some work to maintain internal caches. Normal does
not need to be unit length but must not be the zero vector. */
public void setNormal(Vec3f normal) {
this.normal.set(normal);
this.normal.normalize();
recalc();
}
/** Normal is normalized internally, so <b>normal</b> is not
necessarily equal to <code>plane.setNormal(normal);
plane.getNormal();</code> */
public Vec3f getNormal() {
return normal;
}
/** Setter does some work to maintain internal caches */
public void setPoint(Vec3f point) {
this.point.set(point);
recalc();
}
public Vec3f getPoint() {
return point;
}
/** Project a point onto the plane */
public void projectPoint(Vec3f pt,
Vec3f projPt) {
float scale = normal.dot(pt) - c;
projPt.set(pt.minus(normal.times(normal.dot(point) - c)));
}
/** Intersect a ray with the plane. Returns true if intersection occurred, false
otherwise. This is a two-sided ray cast. */
public boolean intersectRay(Vec3f rayStart,
Vec3f rayDirection,
IntersectionPoint intPt) {
float denom = normal.dot(rayDirection);
if (denom == 0)
return false;
intPt.setT((c - normal.dot(rayStart)) / denom);
intPt.setIntersectionPoint(rayStart.plus(rayDirection.times(intPt.getT())));
return true;
}
//----------------------------------------------------------------------
// Internals only below this point
//
private void recalc() {
c = normal.dot(point);
}
}
|
