BKE_collision.h

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/*
 * ***** 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) Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Daniel Genrich
 *
 * ***** END GPL LICENSE BLOCK *****
 */
#ifndef BKE_COLLISIONS_H
#define BKE_COLLISIONS_H

#include <math.h>
#include <float.h>
#include <stdlib.h>
#include <string.h>

/* types */
#include "BKE_collision.h"
#include "DNA_cloth_types.h"

#include "BLI_kdopbvh.h"

struct Cloth;
struct ClothModifierData;
struct CollisionModifierData;
struct DerivedMesh;
struct Group;
struct MFace;
struct MVert;
struct Object;
struct Scene;
struct LinkNode;

// used for collisions in collision.c

/* COLLISION FLAGS */
typedef enum
{
    COLLISION_IN_FUTURE =       (1 << 1),
#ifdef WITH_ELTOPO
    COLLISION_USE_COLLFACE =    (1 << 2),
    COLLISION_IS_EDGES =        (1 << 3),
#endif
} COLLISION_FLAGS;


// used for collisions in collision.c
/* used for collisions in collision.c */
typedef struct CollPair
{
    unsigned int face1; // cloth face
    unsigned int face2; // object face
    double distance; // magnitude of vector
    float normal[3];
    float vector[3]; // unnormalized collision vector: p2-p1
    float pa[3], pb[3]; // collision point p1 on face1, p2 on face2
    int flag;
    float time; // collision time, from 0 up to 1
#ifdef WITH_ELTOPO /*either ap* or bp* can be set, but not both*/
    float bary[3];
    int ap1, ap2, ap3, collp, bp1, bp2, bp3;
    int collface;
#else
    int ap1, ap2, ap3, bp1, bp2, bp3;
#endif
    int pointsb[4];
}
CollPair;

/* used for collisions in collision.c */
typedef struct EdgeCollPair
{
    unsigned int p11, p12, p21, p22;
    float normal[3];
    float vector[3];
    float time;
    int lastsign;
    float pa[3], pb[3]; // collision point p1 on face1, p2 on face2
}
EdgeCollPair;

/* used for collisions in collision.c */
typedef struct FaceCollPair
{
    unsigned int p11, p12, p13, p21;
    float normal[3];
    float vector[3];
    float time;
    int lastsign;
    float pa[3], pb[3]; // collision point p1 on face1, p2 on face2
}
FaceCollPair;




// forward declarations

// used in modifier.c from collision.c

BVHTree *bvhtree_build_from_mvert ( struct MFace *mfaces, unsigned int numfaces, struct MVert *x, unsigned int numverts, float epsilon );
void bvhtree_update_from_mvert ( BVHTree * bvhtree, struct MFace *faces, int numfaces, struct MVert *x, struct MVert *xnew, int numverts, int moving );


struct LinkNode *BLI_linklist_append_fast ( struct LinkNode **listp, void *ptr );

// move Collision modifier object inter-frame with step = [0,1]
// defined in collisions.c
void collision_move_object ( struct CollisionModifierData *collmd, float step, float prevstep );

// interface for collision functions
void collisions_compute_barycentric ( float pv[3], float p1[3], float p2[3], float p3[3], float *w1, float *w2, float *w3 );
void interpolateOnTriangle ( float to[3], float v1[3], float v2[3], float v3[3], double w1, double w2, double w3 );

// used in effect.c
struct Object **get_collisionobjects(struct Scene *scene, struct Object *self, struct Group *group, unsigned int *numcollobj);

typedef struct ColliderCache {
    struct ColliderCache *next, *prev;
    struct Object *ob;
    struct CollisionModifierData *collmd;
} ColliderCache;

struct ListBase *get_collider_cache(struct Scene *scene, struct Object *self, struct Group *group);
void free_collider_cache(struct ListBase **colliders);





#endif