| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| // OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| // Created : 2005-12-30 |
| // Updated : 2008-10-05 |
| // Licence : This source is under MIT License |
| // File : glm/gtx/closest_point.inl |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef glm_gtx_closest_point |
| #define glm_gtx_closest_point |
| |
| namespace glm |
| { |
| template <typename T, precision P> |
| GLM_FUNC_QUALIFIER detail::tvec3<T, P> closestPointOnLine |
| ( |
| detail::tvec3<T, P> const & point, |
| detail::tvec3<T, P> const & a, |
| detail::tvec3<T, P> const & b |
| ) |
| { |
| T LineLength = distance(a, b); |
| detail::tvec3<T, P> Vector = point - a; |
| detail::tvec3<T, P> LineDirection = (b - a) / LineLength; |
| |
| // Project Vector to LineDirection to get the distance of point from a |
| T Distance = dot(Vector, LineDirection); |
| |
| if(Distance <= T(0)) return a; |
| if(Distance >= LineLength) return b; |
| return a + LineDirection * Distance; |
| } |
| }//namespace glm |
| |
| #endif//glm_gtx_closest_point |
