1// This code is in the public domain -- Ignacio Casta�o <castano@gmail.com> 2 3#pragma once 4#ifndef NV_MATH_PLANE_INL 5#define NV_MATH_PLANE_INL 6 7#include "plane.h" 8#include "vector.inl" 9 10namespace nv 11{ 12 inline Plane::Plane() {} 13 inline Plane::Plane(float x, float y, float z, float w) : v(x, y, z, w) {} 14 inline Plane::Plane(const Vector4 & v) : v(v) {} 15 inline Plane::Plane(const Vector3 & v, float d) : v(v, d) {} 16 inline Plane::Plane(const Vector3 & normal, const Vector3 & point) : v(normal, -dot(normal, point)) {} 17 inline Plane::Plane(const Vector3 & v0, const Vector3 & v1, const Vector3 & v2) { 18 Vector3 n = cross(v1-v0, v2-v0); 19 float d = -dot(n, v0); 20 v = Vector4(n, d); 21 } 22 23 inline const Plane & Plane::operator=(const Plane & p) { v = p.v; return *this; } 24 25 inline Vector3 Plane::vector() const { return v.xyz(); } 26 inline float Plane::offset() const { return v.w; } 27 28 // Normalize plane. 29 inline Plane normalize(const Plane & plane, float epsilon = NV_EPSILON) 30 { 31 const float len = length(plane.vector()); 32 const float inv = isZero(len, epsilon) ? 0 : 1.0f / len; 33 return Plane(plane.v * inv); 34 } 35 36 // Get the signed distance from the given point to this plane. 37 inline float distance(const Plane & plane, const Vector3 & point) 38 { 39 return dot(plane.vector(), point) + plane.offset(); 40 } 41 42 inline void Plane::operator*=(float s) 43 { 44 v *= s; 45 } 46 47} // nv namespace 48 49#endif // NV_MATH_PLANE_H 50