forked from bartvdbraak/blender
fix relating to [#36093] Stationary Particle system - particle Y axis fails to follow emitter object rotation
With deformations and on a simple cube you could get axis flipping with normal-particle alignment. now use the normal & tangent to create the orientation to give a stable matrix that wont flip.
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@ -1660,17 +1660,22 @@ void psys_get_birth_coordinates(ParticleSimulationData *sim, ParticleData *pa, P
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{
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Object *ob = sim->ob;
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ParticleSystem *psys = sim->psys;
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ParticleSettings *part;
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ParticleSettings *part = psys->part;
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ParticleTexture ptex;
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float fac, phasefac, nor[3] = {0,0,0},loc[3],vel[3] = {0.0,0.0,0.0},rot[4],q2[4];
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float r_vel[3],r_ave[3],r_rot[4],vec[3],p_vel[3] = {0.0,0.0,0.0};
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float x_vec[3] = {1.0,0.0,0.0}, utan[3] = {0.0,1.0,0.0}, vtan[3] = {0.0,0.0,1.0}, rot_vec[3] = {0.0,0.0,0.0};
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float q_phase[4];
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const bool use_boids = ((part->phystype == PART_PHYS_BOIDS) &&
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(pa->boid != NULL));
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const bool use_tangents = ((use_boids == false) &&
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((part->tanfac != 0.0f) || (part->rotmode == PART_ROT_NOR)));
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int p = pa - psys->particles;
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part=psys->part;
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/* get birth location from object */
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if (part->tanfac != 0.f)
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if (use_tangents)
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psys_particle_on_emitter(sim->psmd, part->from,pa->num, pa->num_dmcache, pa->fuv,pa->foffset,loc,nor,utan,vtan,0,0);
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else
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psys_particle_on_emitter(sim->psmd, part->from,pa->num, pa->num_dmcache, pa->fuv,pa->foffset,loc,nor,0,0,0,0);
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@ -1688,7 +1693,7 @@ void psys_get_birth_coordinates(ParticleSimulationData *sim, ParticleData *pa, P
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normalize_v3(nor);
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/* -tangent */
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if (part->tanfac!=0.0f) {
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if (use_tangents) {
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//float phase=vg_rot?2.0f*(psys_particle_value_from_verts(sim->psmd->dm,part->from,pa,vg_rot)-0.5f):0.0f;
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float phase=0.0f;
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mul_v3_fl(vtan,-cosf((float)M_PI*(part->tanphase+phase)));
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@ -1737,7 +1742,7 @@ void psys_get_birth_coordinates(ParticleSimulationData *sim, ParticleData *pa, P
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mul_qt_qtqt(r_rot,r_rot,rot);
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}
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if (part->phystype==PART_PHYS_BOIDS && pa->boid) {
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if (use_boids) {
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float dvec[3], q[4], mat[3][3];
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copy_v3_v3(state->co,loc);
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@ -1853,10 +1858,10 @@ void psys_get_birth_coordinates(ParticleSimulationData *sim, ParticleData *pa, P
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}
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/* create rotation quat */
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negate_v3(rot_vec);
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if (use_global_space) {
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/* calculate rotation in global-space */
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negate_v3(rot_vec);
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vec_to_quat(q2, rot_vec, OB_POSX, OB_POSZ);
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/* randomize rotation quat */
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@ -1871,15 +1876,51 @@ void psys_get_birth_coordinates(ParticleSimulationData *sim, ParticleData *pa, P
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/* calculate rotation in local-space */
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float q_obmat[4];
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float q_imat[4];
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float tvec[3];
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mat4_to_quat(q_obmat, ob->obmat);
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invert_qt_qt(q_imat, q_obmat);
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copy_v3_v3(tvec, rot_vec);
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mul_qt_v3(q_imat, tvec);
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normalize_v3(tvec);
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vec_to_quat(q2, tvec, OB_POSX, OB_POSZ);
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if (part->rotmode != PART_ROT_NOR) {
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float rot_vec_local[3];
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/* rot_vec */
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negate_v3(rot_vec);
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copy_v3_v3(rot_vec_local, rot_vec);
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mul_qt_v3(q_imat, rot_vec_local);
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normalize_v3(rot_vec_local);
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vec_to_quat(q2, rot_vec_local, OB_POSX, OB_POSZ);
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}
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else {
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/* (part->rotmode == PART_ROT_NOR) */
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float tmat[3][3];
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/* note: utan_local is not taken from 'utan', we calculate from rot_vec/vtan */
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/* note: it looks like rotation phase may be applied twice (once with vtan, again below)
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* however this isn't the case - campbell */
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float *rot_vec_local = tmat[0];
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float *vtan_local = tmat[1];
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float *utan_local = tmat[2];
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/* use tangents */
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BLI_assert(use_tangents == true);
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/* rot_vec */
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copy_v3_v3(rot_vec_local, rot_vec);
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mul_qt_v3(q_imat, rot_vec_local);
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/* vtan_local */
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copy_v3_v3(vtan_local, vtan); /* flips, cant use */
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mul_qt_v3(q_imat, vtan_local);
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/* ensure orthogonal matrix (rot_vec aligned) */
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cross_v3_v3v3(utan_local, vtan_local, rot_vec_local);
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cross_v3_v3v3(vtan_local, utan_local, rot_vec_local);
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/* note: no need to normalize */
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mat3_to_quat(q2, tmat);
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}
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/* randomize rotation quat */
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if (part->randrotfac != 0.0f) {
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