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Dogcows Code - chaz/yoink/blob - src/Moof/Plane.hh
2 /*******************************************************************************
4 Copyright (c) 2009, Charles McGarvey
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *******************************************************************************/
29 #ifndef _MOOF_PLANE_HH_
30 #define _MOOF_PLANE_HH_
32 #include <Moof/Math.hh>
33 #include <Moof/Shape.hh>
39 template <int D
> class Aabb
;
40 template <int D
> class Sphere
;
44 * A plane in 3-space defined by the equation Ax + By + Cz = D, where [A, B, C]
45 * is normal to the plane.
48 struct Plane
: public Shape
<3>
61 Plane(const Vector3
& vector
, Scalar scalar
) :
64 Plane(Scalar a
, Scalar b
, Scalar c
, Scalar scalar
) :
69 bool intersectRay(const Ray
<3>& ray
, Ray
<3>::Intersection
& hit
)
71 // solve: [(ray.point + t*ray.direction) dot normal] + d = 0
73 Scalar denom
= cml::dot(ray
.direction
, normal
);
75 // check for parallel condition
76 if (denom
== SCALAR(0.0))
78 if (isEqual(cml::dot(ray
.point
, normal
), -d
))
80 // the ray lies on the plane
81 hit
.distance
= SCALAR(0.0);
82 hit
.normal
.set(0.0, 0.0, 0.0);
90 Scalar numer
= cml::dot(ray
.point
, normal
) + d
;
91 hit
.distance
= -numer
/ denom
;
92 if (hit
.distance
< SCALAR(0.0)) return false;
94 if (numer
>= 0.0) hit
.normal
= normal
;
95 else hit
.normal
= -normal
;
100 /* Causes the normal of the plane to become normalized. The scalar may also
101 * be changed to keep the equation true. Word to the wise: don't normalize
102 * a plane if the normal is the zero vector. */
105 Scalar mag
= normal
.length();
112 * Determine the shortest distance between a point and the plane. */
114 Scalar
getDistanceToPoint(const Vector3
& point
) const
116 return cml::dot(point
, normal
) + d
;
119 Halfspace
intersects(const Vector3
& point
) const
121 Scalar distance
= getDistanceToPoint(point
);
123 if (isEqual(distance
, 0.0)) return INTERSECT
;
124 else if (distance
< 0.0) return NEGATIVE
;
125 else return POSITIVE
;
128 Halfspace
intersects(const Aabb
<3>& aabb
) const;
129 Halfspace
intersects(const Sphere
<3>& sphere
) const;
135 #endif // _MOOF_PLANE_HH_
137 /** vim: set ts=4 sw=4 tw=80: *************************************************/
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