diff options
Diffstat (limited to 'source/blender/blenkernel/intern/rigidbody.c')
-rw-r--r-- | source/blender/blenkernel/intern/rigidbody.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/rigidbody.c b/source/blender/blenkernel/intern/rigidbody.c index 09293503ad5..2aaf8adea57 100644 --- a/source/blender/blenkernel/intern/rigidbody.c +++ b/source/blender/blenkernel/intern/rigidbody.c @@ -57,6 +57,7 @@ #include "BKE_effect.h" #include "BKE_global.h" #include "BKE_library.h" +#include "BKE_mesh.h" #include "BKE_object.h" #include "BKE_pointcache.h" #include "BKE_rigidbody.h" @@ -455,6 +456,182 @@ static void rigidbody_validate_sim_shape(Object *ob, bool rebuild) /* --------------------- */ +/* helper function to calculate volume of rigidbody object */ +// TODO: allow a parameter to specify method used to calculate this? +void BKE_rigidbody_calc_volume(Object *ob, float *r_vol) +{ + RigidBodyOb *rbo = ob->rigidbody_object; + + float size[3] = {1.0f, 1.0f, 1.0f}; + float radius = 1.0f; + float height = 1.0f; + + float volume = 0.0f; + + /* if automatically determining dimensions, use the Object's boundbox + * - assume that all quadrics are standing upright on local z-axis + * - assume even distribution of mass around the Object's pivot + * (i.e. Object pivot is centralised in boundbox) + * - boundbox gives full width + */ + // XXX: all dimensions are auto-determined now... later can add stored settings for this + BKE_object_dimensions_get(ob, size); + + if (ELEM3(rbo->shape, RB_SHAPE_CAPSULE, RB_SHAPE_CYLINDER, RB_SHAPE_CONE)) { + /* take radius as largest x/y dimension, and height as z-dimension */ + radius = MAX2(size[0], size[1]) * 0.5f; + height = size[2]; + } + else if (rbo->shape == RB_SHAPE_SPHERE) { + /* take radius to the the largest dimension to try and encompass everything */ + radius = max_fff(size[0], size[1], size[2]) * 0.5f; + } + + /* calculate volume as appropriate */ + switch (rbo->shape) { + case RB_SHAPE_BOX: + volume = size[0] * size[1] * size[2]; + break; + + case RB_SHAPE_SPHERE: + volume = 4.0f / 3.0f * (float)M_PI * radius * radius * radius; + break; + + /* for now, assume that capsule is close enough to a cylinder... */ + case RB_SHAPE_CAPSULE: + case RB_SHAPE_CYLINDER: + volume = (float)M_PI * radius * radius * height; + break; + + case RB_SHAPE_CONE: + volume = (float)M_PI / 3.0f * radius * radius * height; + break; + + case RB_SHAPE_CONVEXH: + case RB_SHAPE_TRIMESH: + { + if (ob->type == OB_MESH) { + DerivedMesh *dm = rigidbody_get_mesh(ob); + MVert *mvert; + MFace *mface; + int totvert, totface; + + /* ensure mesh validity, then grab data */ + if (dm == NULL) + return; + + DM_ensure_tessface(dm); + + mvert = (dm) ? dm->getVertArray(dm) : NULL; + totvert = (dm) ? dm->getNumVerts(dm) : 0; + mface = (dm) ? dm->getTessFaceArray(dm) : NULL; + totface = (dm) ? dm->getNumTessFaces(dm) : 0; + + if (totvert > 0 && totface > 0) { + BKE_mesh_calc_volume(mvert, totvert, mface, totface, &volume, NULL); + } + + /* cleanup temp data */ + if (dm && ob->rigidbody_object->mesh_source == RBO_MESH_BASE) { + dm->release(dm); + } + } + else { + /* rough estimate from boundbox as fallback */ + /* XXX could implement other types of geometry here (curves, etc.) */ + volume = size[0] * size[1] * size[2]; + } + break; + } + +#if 0 // XXX: not defined yet + case RB_SHAPE_COMPOUND: + volume = 0.0f; + break; +#endif + } + + /* return the volume calculated */ + if (r_vol) *r_vol = volume; +} + +void BKE_rigidbody_calc_center_of_mass(Object *ob, float r_com[3]) +{ + RigidBodyOb *rbo = ob->rigidbody_object; + + float size[3] = {1.0f, 1.0f, 1.0f}; + float height = 1.0f; + + zero_v3(r_com); + + /* if automatically determining dimensions, use the Object's boundbox + * - assume that all quadrics are standing upright on local z-axis + * - assume even distribution of mass around the Object's pivot + * (i.e. Object pivot is centralised in boundbox) + * - boundbox gives full width + */ + // XXX: all dimensions are auto-determined now... later can add stored settings for this + BKE_object_dimensions_get(ob, size); + + /* calculate volume as appropriate */ + switch (rbo->shape) { + case RB_SHAPE_BOX: + case RB_SHAPE_SPHERE: + case RB_SHAPE_CAPSULE: + case RB_SHAPE_CYLINDER: + break; + + case RB_SHAPE_CONE: + /* take radius as largest x/y dimension, and height as z-dimension */ + height = size[2]; + /* cone is geometrically centered on the median, + * center of mass is 1/4 up from the base + */ + r_com[2] = -0.25f * height; + break; + + case RB_SHAPE_CONVEXH: + case RB_SHAPE_TRIMESH: + { + if (ob->type == OB_MESH) { + DerivedMesh *dm = rigidbody_get_mesh(ob); + MVert *mvert; + MFace *mface; + int totvert, totface; + + /* ensure mesh validity, then grab data */ + if (dm == NULL) + return; + + DM_ensure_tessface(dm); + + mvert = (dm) ? dm->getVertArray(dm) : NULL; + totvert = (dm) ? dm->getNumVerts(dm) : 0; + mface = (dm) ? dm->getTessFaceArray(dm) : NULL; + totface = (dm) ? dm->getNumTessFaces(dm) : 0; + + if (totvert > 0 && totface > 0) { + BKE_mesh_calc_volume(mvert, totvert, mface, totface, NULL, r_com); + } + + /* cleanup temp data */ + if (dm && ob->rigidbody_object->mesh_source == RBO_MESH_BASE) { + dm->release(dm); + } + } + break; + } + +#if 0 // XXX: not defined yet + case RB_SHAPE_COMPOUND: + volume = 0.0f; + break; +#endif + } +} + +/* --------------------- */ + /** * Create physics sim representation of object given RigidBody settings * @@ -1414,6 +1591,8 @@ struct RigidBodyOb *BKE_rigidbody_copy_object(Object *ob) { return NULL; } struct RigidBodyCon *BKE_rigidbody_copy_constraint(Object *ob) { return NULL; } void BKE_rigidbody_relink_constraint(RigidBodyCon *rbc) {} void BKE_rigidbody_validate_sim_world(Scene *scene, RigidBodyWorld *rbw, bool rebuild) {} +void BKE_rigidbody_calc_volume(Object *ob, float *r_vol) { if (r_vol) *r_vol = 0.0f; } +void BKE_rigidbody_calc_center_of_mass(Object *ob, float r_com[3]) { zero_v3(r_com); } struct RigidBodyWorld *BKE_rigidbody_create_world(Scene *scene) { return NULL; } struct RigidBodyWorld *BKE_rigidbody_world_copy(RigidBodyWorld *rbw) { return NULL; } void BKE_rigidbody_world_groups_relink(struct RigidBodyWorld *rbw) {} |