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Fix T56595: Hair Dynamics stop working after saving new file

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The issue was caused by NaN valid of the average spring length being
stored in the file. This caused accumulation in the springs builder
to also deliver NaNs, which then caused solver itself to not do
anything.

Not sure why these values where never initialized prior to the
accumulation. Or even, why this runime data is stored in a DNA.

Some sanitizing is possible here, but needs to be done with care
to not disrupt Spring production.
This commit is contained in:
Sergey Sharybin
2018-12-27 11:35:31 +01:00
parent 2c0c1f494d
commit 81ab9ef968
1 changed files with 5 additions and 0 deletions
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5
source/blender/blenkernel/intern/cloth.c
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@@ -1285,6 +1285,11 @@ static int cloth_build_springs ( ClothModifierData *clmd, DerivedMesh *dm )
if (!edgelist)
return 0;
clmd->sim_parms->avg_spring_len = 0.0f;
for (i = 0; i < mvert_num; i++) {
cloth->verts[i].avg_spring_len = 0.0f;
}
// structural springs
for ( i = 0; i < numedges; i++ ) {
spring = (ClothSpring *)MEM_callocN ( sizeof ( ClothSpring ), "cloth spring" );