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Diffstat (limited to 'source/blender/freestyle/intern/geometry/GeomUtils.h')
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diff --git a/source/blender/freestyle/intern/geometry/GeomUtils.h b/source/blender/freestyle/intern/geometry/GeomUtils.h new file mode 100644 index 00000000000..1b90f99c2ed --- /dev/null +++ b/source/blender/freestyle/intern/geometry/GeomUtils.h @@ -0,0 +1,277 @@ +/* + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * The Original Code is Copyright (C) 2010 Blender Foundation. + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): none yet. + * + * ***** END GPL LICENSE BLOCK ***** + */ + +#ifndef __GEOMUTILS_H__ +#define __GEOMUTILS_H__ + +/** \file blender/freestyle/intern/geometry/GeomUtils.h + * \ingroup freestyle + * \brief Various tools for geometry + * \author Stephane Grabli + * \date 12/04/2002 + */ + +#include <vector> + +#include "Geom.h" + +#include "../system/FreestyleConfig.h" + +using namespace std; +using namespace Geometry; + +namespace GeomUtils { + +// +// Templated procedures +// +///////////////////////////////////////////////////////////////////////////// + +/*! Computes the distance from a point P to a segment AB */ +template<class T> +real distPointSegment( const T& P, const T& A , const T& B) +{ + T AB, AP, BP; + AB = B - A; + AP = P - A; + BP = P - B; + + real c1(AB * AP); + if (c1 <= 0) + return AP.norm(); + + real c2(AB * AB); + if (c2 <= c1) + return BP.norm(); + + real b = c1 / c2; + T Pb, PPb; + Pb = A + b * AB; + PPb = P - Pb; + + return PPb.norm(); +} + +// +// Non-templated procedures +// +///////////////////////////////////////////////////////////////////////////// +typedef enum { + DONT_INTERSECT, + DO_INTERSECT, + COLINEAR, + COINCIDENT, +} intersection_test; + +LIB_GEOMETRY_EXPORT +intersection_test intersect2dSeg2dSeg(const Vec2r& p1, const Vec2r& p2, // first segment + const Vec2r& p3, const Vec2r& p4, // second segment + Vec2r& res); // found intersection point + +LIB_GEOMETRY_EXPORT +intersection_test intersect2dLine2dLine(const Vec2r& p1, const Vec2r& p2, // first segment + const Vec2r& p3, const Vec2r& p4, // second segment + Vec2r& res); // found intersection point + +LIB_GEOMETRY_EXPORT +intersection_test intersect2dSeg2dSegParametric(const Vec2r& p1, const Vec2r& p2, // first segment + const Vec2r& p3, const Vec2r& p4, // second segment + real& t, // I = P1 + t * P1P2) + real& u, // I = P3 + u * P3P4 + real epsilon = M_EPSILON); + +/*! check whether a 2D segment intersect a 2D region or not */ +LIB_GEOMETRY_EXPORT +bool intersect2dSeg2dArea(const Vec2r& min, const Vec2r& max, const Vec2r& A, const Vec2r& B); + +/*! check whether a 2D segment is included in a 2D region or not */ +LIB_GEOMETRY_EXPORT +bool include2dSeg2dArea(const Vec2r& min, const Vec2r& max, const Vec2r& A, const Vec2r& B); + +/*! Box-triangle overlap test, adapted from Tomas Akenine-Möller code */ +LIB_GEOMETRY_EXPORT +bool overlapTriangleBox(Vec3r& boxcenter, Vec3r& boxhalfsize, Vec3r triverts[3]); + +/*! Fast, Minimum Storage Ray-Triangle Intersection, adapted from Tomas Möller and Ben Trumbore code. */ +LIB_GEOMETRY_EXPORT +bool intersectRayTriangle(const Vec3r& orig, const Vec3r& dir, const Vec3r& v0, const Vec3r& v1, const Vec3r& v2, + real& t, // I = orig + t * dir + real& u, real& v, // I = (1 - u - v) * v0 + u * v1 + v * v2 + const real epsilon = M_EPSILON); // the epsilon to use + +/*! Intersection between plane and ray adapted from Graphics Gems, Didier Badouel */ +LIB_GEOMETRY_EXPORT +intersection_test intersectRayPlane(const Vec3r& orig, const Vec3r& dir, // ray origin and direction + // plane's normal and offset (plane = { P / P.N + d = 0 }) + const Vec3r& norm, const real d, + real& t, // I = orig + t * dir + const real epsilon = M_EPSILON); // the epsilon to use + +/*! Intersection Ray-Bounding box (axis aligned). + * Adapted from Williams et al, "An Efficient Robust Ray-Box Intersection Algorithm", JGT 10:1 (2005), pp. 49-54. + */ +LIB_GEOMETRY_EXPORT +bool intersectRayBBox(const Vec3r& orig, const Vec3r& dir, // ray origin and direction + const Vec3r& boxMin, const Vec3r& boxMax, // the bbox + // the interval in which at least on of the intersections must happen + real t0, real t1, + real& tmin, // Imin = orig + tmin * dir is the first intersection + real& tmax, // Imax = orig + tmax * dir is the second intersection + real epsilon = M_EPSILON); // the epsilon to use + +/*! Checks whether 3D point P lies inside or outside of the triangle ABC */ +LIB_GEOMETRY_EXPORT +bool includePointTriangle(const Vec3r& P, const Vec3r& A, const Vec3r& B, const Vec3r& C); + +LIB_GEOMETRY_EXPORT +void transformVertex(const Vec3r& vert, const Matrix44r& matrix, Vec3r& res); + +LIB_GEOMETRY_EXPORT +void transformVertices(const vector<Vec3r>& vertices, const Matrix44r& trans, vector<Vec3r>& res); + +LIB_GEOMETRY_EXPORT +Vec3r rotateVector(const Matrix44r& mat, const Vec3r& v); + +// +// Coordinates systems changing procedures +// +///////////////////////////////////////////////////////////////////////////// + +/*! From world to image + * p + * point's coordinates expressed in world coordinates system + * q + * vector in which the result will be stored + * model_view_matrix + * The model view matrix expressed in line major order (OpenGL + * matrices are column major ordered) + * projection_matrix + * The projection matrix expressed in line major order (OpenGL + * matrices are column major ordered) + * viewport + * The viewport: x,y coordinates followed by width and height (OpenGL like viewport) + */ +LIB_GEOMETRY_EXPORT +void fromWorldToImage(const Vec3r& p, Vec3r& q, const real model_view_matrix[4][4], const real projection_matrix[4][4], + const int viewport[4]); + +/*! From world to image + * p + * point's coordinates expressed in world coordinates system + * q + * vector in which the result will be stored + * transform + * The transformation matrix (gathering model view and projection), + * expressed in line major order (OpenGL matrices are column major ordered) + * viewport + * The viewport: x,y coordinates followed by width and height (OpenGL like viewport) + */ +LIB_GEOMETRY_EXPORT +void fromWorldToImage(const Vec3r& p, Vec3r& q, const real transform[4][4], const int viewport[4]); + +/*! Projects from world coordinates to camera coordinates + * Returns the point's coordinates expressed in the camera's + * coordinates system. + * p + * point's coordinates expressed in world coordinates system + * q + * vector in which the result will be stored + * model_view_matrix + * The model view matrix expressed in line major order (OpenGL + * matrices are column major ordered) + */ +LIB_GEOMETRY_EXPORT +void fromWorldToCamera(const Vec3r& p, Vec3r& q, const real model_view_matrix[4][4]); + +/*! Projects from World Coordinates to retina coordinates + * Returns the point's coordinates expressed in Retina system. + * p + * point's coordinates expressed in camera system + * q + * vector in which the result will be stored + * projection_matrix + * The projection matrix expressed in line major order (OpenGL + * matrices are column major ordered) + */ +LIB_GEOMETRY_EXPORT +void fromCameraToRetina(const Vec3r& p, Vec3r& q, const real projection_matrix[4][4]); + +/*! From retina to image. + * Returns the coordinates expressed in Image coorinates system. + * p + * point's coordinates expressed in retina system + * q + * vector in which the result will be stored + * viewport + * The viewport: x,y coordinates followed by width and height (OpenGL like viewport). + */ +LIB_GEOMETRY_EXPORT +void fromRetinaToImage(const Vec3r& p, Vec3r& q, const int viewport[4]); + +/*! From image to retina + * p + * point's coordinates expressed in image system + * q + * vector in which the result will be stored + * viewport + * The viewport: x,y coordinates followed by width and height (OpenGL like viewport). + */ +LIB_GEOMETRY_EXPORT +void fromImageToRetina(const Vec3r& p, Vec3r& q, const int viewport[4]); + +/*! computes the coordinates of q in the camera coordinates system, + * using the known z coordinates of the 3D point. + * That means that this method does not inverse any matrices, + * it only computes X and Y from x,y and Z) + * p + * point's coordinates expressed in retina system + * q + * vector in which the result will be stored + * projection_matrix + * The projection matrix expressed in line major order (OpenGL + * matrices are column major ordered) + */ +LIB_GEOMETRY_EXPORT +void fromRetinaToCamera(const Vec3r& p, Vec3r& q, real z, const real projection_matrix[4][4]); + +/*! Projects from camera coordinates to world coordinates + * Returns the point's coordinates expressed in the world's + * coordinates system. + * p + * point's coordinates expressed in the camera coordinates system + * q + * vector in which the result will be stored + * model_view_matrix + * The model view matrix expressed in line major order (OpenGL + * matrices are column major ordered) + */ +LIB_GEOMETRY_EXPORT +void fromCameraToWorld(const Vec3r& p, Vec3r& q, const real model_view_matrix[4][4]); + +} // end of namespace GeomUtils + +#endif // __GEOMUTILS_H__ |