comparison: src/geometry.cpp
src/geometry.cpp
- changeset 55
- cb81ecb5fb23
- child 58
- b7841cd31fb7
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| 54:a4055f67b9c7 | 55:cb81ecb5fb23 |
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| 1 #include "geometry.h" | |
| 2 | |
| 3 /** | |
| 4 * @brief Computes a line from two points | |
| 5 * @param point_1 | |
| 6 * @param point_2 | |
| 7 * @return line | |
| 8 */ | |
| 9 geom::Line geom::lineFromPoints(const glm::vec3& point_1, const glm::vec3 point_2) | |
| 10 { | |
| 11 return {point_2 - point_1, point_1}; | |
| 12 } | |
| 13 | |
| 14 /** | |
| 15 * @brief Computes line-plane intersection | |
| 16 * @param line | |
| 17 * @param plane | |
| 18 * @return point of intersection. Does not return a value if the line is in parallel to the plane. | |
| 19 */ | |
| 20 std::optional<glm::vec3> geom::linePlaneIntersection(const geom::Line& line, const geom::Plane& plane) | |
| 21 { | |
| 22 const float denominator = glm::dot(line.direction, plane.normal); | |
| 23 if (std::abs(denominator) < 1e-8f) | |
| 24 { | |
| 25 return {}; | |
| 26 } | |
| 27 else | |
| 28 { | |
| 29 const float d = glm::dot(plane.anchor - line.anchor, plane.normal) / denominator; | |
| 30 return line.anchor + d * line.direction; | |
| 31 } | |
| 32 } | |
| 33 | |
| 34 /** | |
| 35 * @brief Computes the plane of a triangle | |
| 36 * @param triangle | |
| 37 * @return plane | |
| 38 */ | |
| 39 geom::Plane geom::planeFromTriangle(const geom::Triangle& triangle) | |
| 40 { | |
| 41 return geom::Plane{triangle.points[0], normalVector(triangle)}; | |
| 42 } | |
| 43 | |
| 44 /** | |
| 45 * @brief Computes the normal vector of a triangle | |
| 46 * @param triangle | |
| 47 * @return normal vector | |
| 48 */ | |
| 49 glm::vec3 geom::normalVector(const geom::Triangle& triangle) | |
| 50 { | |
| 51 return glm::normalize( | |
| 52 glm::cross( | |
| 53 triangle.points[1] - triangle.points[0], | |
| 54 triangle.points[2] - triangle.points[0])); | |
| 55 } |
