/**************************************************************************** Copyright (c) 2014-2016 Chukong Technologies Inc. Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd. https://axis-project.github.io/ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ****************************************************************************/ #include "3d/CCPlane.h" NS_AX_BEGIN Plane::Plane() : _normal(0.f, 0.f, 1.f), _dist(0.f) {} // create plane from tree point Plane::Plane(const Vec3& p1, const Vec3& p2, const Vec3& p3) { initPlane(p1, p2, p3); } // create plane from normal and dist Plane::Plane(const Vec3& normal, float dist) { initPlane(normal, dist); } // create plane from normal and a point on plane Plane::Plane(const Vec3& normal, const Vec3& point) { initPlane(normal, point); } void Plane::initPlane(const Vec3& p1, const Vec3& p2, const Vec3& p3) { Vec3 p21 = p2 - p1; Vec3 p32 = p3 - p2; Vec3::cross(p21, p32, &_normal); _normal.normalize(); _dist = _normal.dot(p1); } void Plane::initPlane(const Vec3& normal, float dist) { float oneOverLength = 1 / normal.length(); _normal = normal * oneOverLength; _dist = dist * oneOverLength; } void Plane::initPlane(const Vec3& normal, const Vec3& point) { _normal = normal; _normal.normalize(); _dist = _normal.dot(point); } float Plane::dist2Plane(const Vec3& p) const { return _normal.dot(p) - _dist; } PointSide Plane::getSide(const Vec3& point) const { float dist = dist2Plane(point); if (dist > 0) return PointSide::FRONT_PLANE; else if (dist < 0) return PointSide::BEHIND_PLANE; else return PointSide::IN_PLANE; } NS_AX_END