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51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
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#pragma once
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#ifndef NV_MATH_PLANE_INL
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#define NV_MATH_PLANE_INL
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#include "Plane.h"
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#include "Vector.inl"
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namespace nv
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{
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inline Plane::Plane() {}
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inline Plane::Plane(float x, float y, float z, float w) : v(x, y, z, w) {}
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inline Plane::Plane(const Vector4 & v) : v(v) {}
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inline Plane::Plane(const Vector3 & v, float d) : v(v, d) {}
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inline Plane::Plane(const Vector3 & normal, const Vector3 & point) : v(normal, -dot(normal, point)) {}
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inline Plane::Plane(const Vector3 & v0, const Vector3 & v1, const Vector3 & v2) {
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Vector3 n = cross(v1-v0, v2-v0);
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float d = -dot(n, v0);
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v = Vector4(n, d);
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}
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inline const Plane & Plane::operator=(const Plane & p) { v = p.v; return *this; }
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inline Vector3 Plane::vector() const { return v.xyz(); }
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inline float Plane::offset() const { return v.w; }
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inline Vector3 Plane::normal() const { return normalize(vector(), 0.0f); }
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// Normalize plane.
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inline Plane normalize(const Plane & plane, float epsilon = NV_EPSILON)
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{
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const float len = length(plane.vector());
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const float inv = isZero(len, epsilon) ? 0 : 1.0f / len;
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return Plane(plane.v * inv);
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}
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// Get the signed distance from the given point to this plane.
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inline float distance(const Plane & plane, const Vector3 & point)
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{
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return dot(plane.vector(), point) + plane.offset();
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}
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inline void Plane::operator*=(float s)
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{
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v *= s;
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}
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} // nv namespace
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#endif // NV_MATH_PLANE_H
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