143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2006 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): André Pinto
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#ifndef __BKE_BVHUTILS_H__
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#define __BKE_BVHUTILS_H__
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/** \file BKE_bvhutils.h
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* \ingroup bke
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*/
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#include "BLI_bitmap.h"
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#include "BLI_kdopbvh.h"
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/*
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* This header encapsulates necessary code to buld a BVH
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*/
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struct DerivedMesh;
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struct MVert;
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struct MFace;
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/*
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* struct that kepts basic information about a BVHTree build from a mesh
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*/
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typedef struct BVHTreeFromMesh {
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struct BVHTree *tree;
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/* default callbacks to bvh nearest and raycast */
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BVHTree_NearestPointCallback nearest_callback;
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BVHTree_RayCastCallback raycast_callback;
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/* Vertex array, so that callbacks have instante access to data */
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struct MVert *vert;
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struct MEdge *edge; /* only used for BVHTreeFromMeshEdges */
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struct MFace *face;
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bool vert_allocated;
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bool edge_allocated;
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bool face_allocated;
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/* radius for raycast */
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float sphere_radius;
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/* Private data */
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void *em_evil; /* var only for snapping */
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bool cached;
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} BVHTreeFromMesh;
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/*
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* Builds a bvh tree where nodes are the relevant elements of the given mesh.
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* Configures BVHTreeFromMesh.
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*
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* The tree is build in mesh space coordinates, this means special care must be made on queries
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* so that the coordinates and rays are first translated on the mesh local coordinates.
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* Reason for this is that bvh_from_mesh_* can use a cache in some cases and so it becomes possible to reuse a BVHTree.
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*
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* free_bvhtree_from_mesh should be called when the tree is no longer needed.
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*/
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BVHTree *bvhtree_from_mesh_verts(struct BVHTreeFromMesh *data, struct DerivedMesh *mesh, float epsilon, int tree_type, int axis);
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BVHTree *bvhtree_from_mesh_verts_ex(struct BVHTreeFromMesh *data, struct MVert *vert, const int numVerts,
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const bool vert_allocated, BLI_bitmap *mask, int numVerts_active,
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float epsilon, int tree_type, int axis);
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BVHTree *bvhtree_from_mesh_edges(struct BVHTreeFromMesh *data, struct DerivedMesh *mesh, float epsilon, int tree_type, int axis);
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BVHTree *bvhtree_from_mesh_faces(struct BVHTreeFromMesh *data, struct DerivedMesh *mesh, float epsilon, int tree_type, int axis);
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BVHTree *bvhtree_from_mesh_faces_ex(struct BVHTreeFromMesh *data, struct MVert *vert, const bool vert_allocated,
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struct MFace *face, const int numFaces, const bool face_allocated,
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BLI_bitmap *mask, int numFaces_active,
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float epsilon, int tree_type, int axis);
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/*
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* Frees data allocated by a call to bvhtree_from_mesh_*.
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*/
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void free_bvhtree_from_mesh(struct BVHTreeFromMesh *data);
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/*
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* Math functions used by callbacks
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*/
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float bvhtree_ray_tri_intersection(const BVHTreeRay *ray, const float m_dist, const float v0[3], const float v1[3], const float v2[3]);
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float nearest_point_in_tri_surface_squared(const float v0[3], const float v1[3], const float v2[3], const float p[3], int *v, int *e, float nearest[3]);
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/*
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* BVHCache
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*/
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/* Using local coordinates */
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enum {
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BVHTREE_FROM_VERTS = 0,
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BVHTREE_FROM_EDGES = 1,
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BVHTREE_FROM_FACES = 2,
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BVHTREE_FROM_FACES_EDITMESH = 3,
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};
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typedef struct LinkNode *BVHCache;
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/*
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* Queries a bvhcache for the cache bvhtree of the request type
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*/
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BVHTree *bvhcache_find(BVHCache *cache, int type);
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/*
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* Inserts a BVHTree of the given type under the cache
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* After that the caller no longer needs to worry when to free the BVHTree
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* as that will be done when the cache is freed.
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*
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* A call to this assumes that there was no previous cached tree of the given type
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*/
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void bvhcache_insert(BVHCache *cache, BVHTree *tree, int type);
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/*
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* inits and frees a bvhcache
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*/
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void bvhcache_init(BVHCache *cache);
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void bvhcache_free(BVHCache *cache);
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#endif
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