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Fix #141400: Metaball tessellation unresponsive with a scaled parent

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The check to prevent overly complex tessellation checked the objects
scale directly instead of the final evaluated scale.

Also corrects the scale check which wasn't accounting for negative axes.
This commit is contained in:
Campbell Barton
2025-07-09 15:15:58 +10:00
parent 5bf8edb589
commit 3d6e9756c7
1 changed files with 13 additions and 8 deletions
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21
source/blender/blenkernel/intern/mball_tessellate.cc
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@@ -1410,15 +1410,20 @@ Mesh *BKE_mball_polygonize(Depsgraph *depsgraph, Scene *scene, Object *ob)
build_bvh_spatial(&process, &process.metaball_bvh, 0, process.totelem, &process.allbb);
/* Don't polygonize meta-balls with too high resolution (base meta-ball too small).
* NOTE: Epsilon was 0.0001f but this was giving problems for blood animation for
* the open movie "Sintel", using 0.00001f. */
if (ob->scale[0] < 0.00001f * (process.allbb.max[0] - process.allbb.min[0]) ||
ob->scale[1] < 0.00001f * (process.allbb.max[1] - process.allbb.min[1]) ||
ob->scale[2] < 0.00001f * (process.allbb.max[2] - process.allbb.min[2]))
{
freepolygonize(&process);
return nullptr;
/* Don't polygonize meta-balls with too high resolution (base meta-ball too small).
* NOTE: Epsilon was 0.0001f but this was giving problems for blood animation for
* the open movie "Sintel", using 0.00001f. */
const float eps = 0.00001f;
const blender::float4x4 &object_to_world = ob->object_to_world();
for (int i = 0; i < 3; i++) {
if (blender::math::length_squared(object_to_world[i].xyz()) <
blender::math::square(eps * (process.allbb.max[i] - process.allbb.min[i])))
{
freepolygonize(&process);
return nullptr;
}
}
}
polygonize(&process);