[Bf-blender-cvs] [fcfbe27] master: Part of D1903: Dynamic base mesh for cloth simulation
Luca Rood
noreply at git.blender.org
Fri May 6 11:07:09 CEST 2016
Commit: fcfbe27826bf900e8ecc10927b6415edfc316e78
Author: Luca Rood
Date: Mon Apr 11 12:21:17 2016 +0300
Branches: master
https://developer.blender.org/rBfcfbe27826bf900e8ecc10927b6415edfc316e78
Part of D1903: Dynamic base mesh for cloth simulation
A function that recalculates cloth spring lengths.
===================================================================
M source/blender/blenkernel/intern/cloth.c
===================================================================
diff --git a/source/blender/blenkernel/intern/cloth.c b/source/blender/blenkernel/intern/cloth.c
index 1756543..a133f37 100644
--- a/source/blender/blenkernel/intern/cloth.c
+++ b/source/blender/blenkernel/intern/cloth.c
@@ -58,6 +58,7 @@ static void cloth_to_object (Object *ob, ClothModifierData *clmd, float (*verte
static void cloth_from_mesh ( ClothModifierData *clmd, DerivedMesh *dm );
static int cloth_from_object(Object *ob, ClothModifierData *clmd, DerivedMesh *dm, float framenr, int first);
static void cloth_update_springs( ClothModifierData *clmd );
+static void cloth_update_spring_lengths( ClothModifierData *clmd, DerivedMesh *dm );
static int cloth_build_springs ( ClothModifierData *clmd, DerivedMesh *dm );
static void cloth_apply_vgroup ( ClothModifierData *clmd, DerivedMesh *dm );
@@ -369,6 +370,10 @@ static int do_step_cloth(Object *ob, ClothModifierData *clmd, DerivedMesh *resul
/* Support for dynamic vertex groups, changing from frame to frame */
cloth_apply_vgroup ( clmd, result );
+
+ if ( 0 )
+ cloth_update_spring_lengths ( clmd, result );
+
cloth_update_springs( clmd );
// TIMEIT_START(cloth_step)
@@ -1175,6 +1180,51 @@ static void cloth_update_springs( ClothModifierData *clmd )
cloth_hair_update_bending_targets(clmd);
}
+/* Update spring rest lenght, for dynamically deformable cloth */
+static void cloth_update_spring_lengths( ClothModifierData *clmd, DerivedMesh *dm )
+{
+ Cloth *cloth = clmd->clothObject;
+ LinkNode *search = cloth->springs;
+ unsigned int struct_springs = 0;
+ unsigned int i = 0;
+ unsigned int mvert_num = (unsigned int)dm->getNumVerts(dm);
+ float shrink_factor;
+
+ clmd->sim_parms->avg_spring_len = 0.0f;
+
+ for (i = 0; i < mvert_num; i++) {
+ cloth->verts[i].avg_spring_len = 0.0f;
+ }
+
+ while (search) {
+ ClothSpring *spring = search->link;
+
+ if ( spring->type != CLOTH_SPRING_TYPE_SEWING ) {
+ if (clmd->sim_parms->vgroup_shrink > 0)
+ shrink_factor = 1.0f - ((cloth->verts[spring->ij].shrink_factor + cloth->verts[spring->kl].shrink_factor) / 2.0f);
+ else
+ shrink_factor = 1.0f - clmd->sim_parms->shrink_min;
+ spring->restlen = len_v3v3(cloth->verts[spring->kl].xrest, cloth->verts[spring->ij].xrest) * shrink_factor;
+ }
+
+ if ( spring->type == CLOTH_SPRING_TYPE_STRUCTURAL ) {
+ clmd->sim_parms->avg_spring_len += spring->restlen;
+ cloth->verts[spring->ij].avg_spring_len += spring->restlen;
+ cloth->verts[spring->kl].avg_spring_len += spring->restlen;
+ struct_springs++;
+ }
+
+ search = search->next;
+ }
+
+ if (struct_springs > 0)
+ clmd->sim_parms->avg_spring_len /= struct_springs;
+
+ for (i = 0; i < mvert_num; i++) {
+ cloth->verts[i].avg_spring_len = cloth->verts[i].avg_spring_len * 0.49f / ((float)cloth->verts[i].spring_count);
+ }
+}
+
BLI_INLINE void cross_identity_v3(float r[3][3], const float v[3])
{
zero_m3(r);
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