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82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
// This code is in the public domain -- Ignacio Castaño <castanyo@yahoo.es>
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#ifndef NV_MATH_TRIANGLE_H
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#define NV_MATH_TRIANGLE_H
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#include <nvmath/nvmath.h>
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#include <nvmath/Vector.h>
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#include <nvmath/Box.h>
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namespace nv
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{
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/// Triangle class with three vertices.
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class Triangle
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{
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public:
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Triangle() {};
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Triangle(Vector3::Arg v0, Vector3::Arg v1, Vector3::Arg v2)
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{
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v[0] = v0;
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v[1] = v1;
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v[2] = v2;
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}
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/// Get the bounds of the triangle.
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Box bounds() const
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{
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Box bounds;
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bounds.clearBounds();
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bounds.addPointToBounds(v[0]);
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bounds.addPointToBounds(v[1]);
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bounds.addPointToBounds(v[2]);
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return bounds;
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}
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Vector4 plane() const
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{
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Vector3 n = cross(v[1]-v[0], v[2]-v[0]);
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return Vector4(n, dot(n, v[0]));
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}
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Vector3 v[3];
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};
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// Tomas Akenine-Möller box-triangle test.
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NVMATH_API bool triBoxOverlap(Vector3::Arg boxcenter, Vector3::Arg boxhalfsize, const Triangle & triangle);
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NVMATH_API bool triBoxOverlapNoBounds(Vector3::Arg boxcenter, Vector3::Arg boxhalfsize, const Triangle & triangle);
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// Moller ray triangle test.
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NVMATH_API bool rayTest_Moller(const Triangle & t, Vector3::Arg orig, Vector3::Arg dir, float * out_t, float * out_u, float * out_v);
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inline bool rayTest(const Triangle & t, Vector3::Arg orig, Vector3::Arg dir, float * out_t, float * out_u, float * out_v)
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{
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return rayTest_Moller(t, orig, dir, out_t, out_u, out_v);
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}
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inline bool overlap(const Triangle & t, const Box & b)
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{
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Vector3 center = b.center();
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Vector3 extents = b.extents();
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return triBoxOverlap(center, extents, t);
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}
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inline bool overlap(const Box & b, const Triangle & t)
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{
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return overlap(t, b);
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}
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inline bool overlapNoBounds(const Triangle & t, const Box & b)
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{
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Vector3 center = b.center();
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Vector3 extents = b.extents();
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return triBoxOverlapNoBounds(center, extents, t);
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}
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} // nv namespace
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#endif // NV_MATH_TRIANGLE_H
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