Lukas Tönne
4633e655dc
This was a ToDo item, for mesh-based rigid body shapes (trimesh, convex) the operator was simply using the bounding box volume, which can grossly overestimate the volume and mass. Calculating the actual volume of a mesh is not so difficult after all, see e.g. http://research.microsoft.com/en-us/um/people/chazhang/publications/icip01_ChaZhang.pdf This patch also allows calculating the center-of-mass in the same way. This is currently unused, because the rigid body system assumes the CoM to be the same as the geometric object center. This is fine most of the time, adding such user settings for "center-of-mass offset" would also add quite a bit of complexity in user space, but it could be necessary at some point. A number of other physical properties could be calculated using the same principle, e.g. the moment of inertia.
103 lines
3.9 KiB
C++
103 lines
3.9 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) 2013 Blender Foundation
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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): Joshua Leung, Sergej Reich
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file BKE_rigidbody.h
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* \ingroup blenkernel
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* \brief API for Blender-side Rigid Body stuff
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*/
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#ifndef __BKE_RIGIDBODY_H__
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#define __BKE_RIGIDBODY_H__
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struct RigidBodyWorld;
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struct RigidBodyOb;
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struct Scene;
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struct Object;
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struct Group;
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/* -------------- */
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/* Memory Management */
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void BKE_rigidbody_free_world(struct RigidBodyWorld *rbw);
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void BKE_rigidbody_free_object(struct Object *ob);
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void BKE_rigidbody_free_constraint(struct Object *ob);
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/* ...... */
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struct RigidBodyOb *BKE_rigidbody_copy_object(struct Object *ob);
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struct RigidBodyCon *BKE_rigidbody_copy_constraint(struct Object *ob);
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void BKE_rigidbody_relink_constraint(struct RigidBodyCon *rbc);
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/* -------------- */
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/* Setup */
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/* create Blender-side settings data - physics objects not initialized yet */
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struct RigidBodyWorld *BKE_rigidbody_create_world(struct Scene *scene);
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struct RigidBodyOb *BKE_rigidbody_create_object(struct Scene *scene, struct Object *ob, short type);
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struct RigidBodyCon *BKE_rigidbody_create_constraint(struct Scene *scene, struct Object *ob, short type);
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/* copy */
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struct RigidBodyWorld *BKE_rigidbody_world_copy(struct RigidBodyWorld *rbw);
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void BKE_rigidbody_world_groups_relink(struct RigidBodyWorld *rbw);
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/* 'validate' (i.e. make new or replace old) Physics-Engine objects */
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void BKE_rigidbody_validate_sim_world(struct Scene *scene, struct RigidBodyWorld *rbw, bool rebuild);
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void BKE_rigidbody_calc_volume(struct Object *ob, float *r_vol);
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void BKE_rigidbody_calc_center_of_mass(struct Object *ob, float r_com[3]);
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/* -------------- */
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/* Utilities */
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struct RigidBodyWorld *BKE_rigidbody_get_world(struct Scene *scene);
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void BKE_rigidbody_remove_object(struct Scene *scene, struct Object *ob);
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void BKE_rigidbody_remove_constraint(struct Scene *scene, struct Object *ob);
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/* -------------- */
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/* Utility Macros */
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/* get mass of Rigid Body Object to supply to RigidBody simulators */
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#define RBO_GET_MASS(rbo) \
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((rbo && ((rbo->type == RBO_TYPE_PASSIVE) || (rbo->flag & RBO_FLAG_KINEMATIC) || (rbo->flag & RBO_FLAG_DISABLED))) ? (0.0f) : (rbo->mass))
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/* get collision margin for Rigid Body Object, triangle mesh and cone shapes cannot embed margin, convex hull always uses custom margin */
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#define RBO_GET_MARGIN(rbo) \
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((rbo->flag & RBO_FLAG_USE_MARGIN || rbo->shape == RB_SHAPE_CONVEXH || rbo->shape == RB_SHAPE_TRIMESH || rbo->shape == RB_SHAPE_CONE) ? (rbo->margin) : (0.04f))
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/* -------------- */
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/* Simulation */
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void BKE_rigidbody_aftertrans_update(struct Object *ob, float loc[3], float rot[3], float quat[4], float rotAxis[3], float rotAngle);
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void BKE_rigidbody_sync_transforms(struct RigidBodyWorld *rbw, struct Object *ob, float ctime);
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bool BKE_rigidbody_check_sim_running(struct RigidBodyWorld *rbw, float ctime);
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void BKE_rigidbody_cache_reset(struct RigidBodyWorld *rbw);
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void BKE_rigidbody_rebuild_world(struct Scene *scene, float ctime);
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void BKE_rigidbody_do_simulation(struct Scene *scene, float ctime);
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#endif /* __BKE_RIGIDBODY_H__ */
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