[Bf-blender-cvs] [fcfbe27] master: Part of D1903: Dynamic base mesh for cloth simulation

[Luca Rood]

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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