[2755] | 1 | #ifndef __Plane3_H__
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| 2 | #define __Plane3_H__
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[2751] | 3 |
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| 4 | #include "Vector3.h"
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| 5 |
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[2755] | 6 |
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[2776] | 7 | namespace CHCDemoEngine
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[2751] | 8 | {
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| 9 |
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[2944] | 10 | /** Class describing a plane in 3D space.
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[2751] | 11 | */
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| 12 | class Plane3
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| 13 | {
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| 14 | public:
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| 15 |
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| 16 | Plane3() {}
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| 17 |
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| 18 | Plane3(const Vector3 &a, const Vector3 &b, const Vector3 &c);
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[2944] | 19 | /** Note: we assume that the normal vector is already normalized.
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| 20 | */
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[2751] | 21 | Plane3(const Vector3 &normal, const Vector3 &point);
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| 22 |
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[2755] | 23 | inline void ReverseOrientation()
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[2751] | 24 | {
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| 25 | mNormal *= -1;
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| 26 | mD *= -1;
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| 27 | }
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[2853] | 28 | /** Get distance to a point.
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[2755] | 29 | */
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| 30 | inline float Distance(const Vector3 &v) const
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[2751] | 31 | {
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| 32 | return DotProd(v, mNormal) + mD;
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| 33 | }
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| 34 |
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| 35 | enum {BACK_SIDE = -1, INTERSECTS = 0, FRONT_SIDE = 1};
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| 36 | /** Returns 1 if v is on front side, -1 if on back side, 0 if on plane.
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| 37 | */
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[2911] | 38 | int Side(const Vector3 &v, float threshold = 1e-6) const;
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[2751] | 39 | /** Finds intersection of line segment between points a and b with plane.
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| 40 | @param a start point
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| 41 | @param b end point
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| 42 | @param t if not NULL, returns parameter value of intersections
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| 43 | @param coplanar if not NULL, returns true if plane and line segments are coplanar.
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| 44 | */
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| 45 | Vector3 FindIntersection(const Vector3 &a,
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| 46 | const Vector3 &b,
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| 47 | float *t = NULL,
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| 48 | bool *coplanar = NULL) const;
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| 49 |
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| 50 | /** Finds value of intersection parameter t on line segment from a to b.
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| 51 | @returns 0 if coplanar, else parameter t
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| 52 | */
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| 53 | float FindT(const Vector3 &a, const Vector3 &b) const;
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| 54 |
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[2911] | 55 | operator const float*() const
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| 56 | {
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| 57 | return (const float*) this;
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| 58 | }
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[2751] | 59 |
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[2911] | 60 | float& operator[] (const int inx)
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| 61 | {
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| 62 | return (&mNormal.x)[inx];
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| 63 | }
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| 64 |
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| 65 | const float &operator[] (const int inx) const
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| 66 | {
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| 67 | return *(&mNormal.x + inx);
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| 68 | }
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[2944] | 69 | /** Transforms the plane with the matrix m.
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| 70 | */
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| 71 | void Transform(const Matrix4x4 &m);
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[2911] | 72 |
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[2944] | 73 |
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[2755] | 74 | ///////////
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[2751] | 75 | //-- friends
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| 76 |
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| 77 | friend bool PlaneIntersection(const Plane3 &a, const Plane3 &b, const Plane3 &c, Vector3 &result);
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| 78 |
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| 79 | friend bool PlaneIntersection(const Plane3 &p1, const Plane3 &p2);
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[2911] | 80 |
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[2751] | 81 |
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| 82 | friend std::ostream &operator<<(std::ostream &s, const Plane3 &p)
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| 83 | {
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[2755] | 84 | s << p.mNormal << " " << p.mD;
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[2751] | 85 | return s;
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| 86 | }
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| 87 |
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| 88 |
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[2944] | 89 | //protected:
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| 90 |
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[2751] | 91 | ///////////////
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| 92 |
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| 93 | Vector3 mNormal;
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| 94 | float mD;
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| 95 | };
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| 96 |
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[2911] | 97 |
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[2751] | 98 | }
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| 99 | #endif
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