[Bf-blender-cvs] [e73fd4f0c03] master: Fix (unreported) important memory leak in Boolean modifier using a Collection operand and Fast mode.
Bastien Montagne
noreply at git.blender.org
Fri Jun 3 16:08:38 CEST 2022
Commit: e73fd4f0c03f9584eb3ac4aa3d1c07c83ddec759
Author: Bastien Montagne
Date: Fri Jun 3 15:35:49 2022 +0200
Branches: master
https://developer.blender.org/rBe73fd4f0c03f9584eb3ac4aa3d1c07c83ddec759
Fix (unreported) important memory leak in Boolean modifier using a Collection operand and Fast mode.
Code handling repetitive boolean operations when using several objects
from a Collection would not handle result mesh properly, re-creating for
each object without properly freeing it.
Further more, existing code was effectively converting the BMesh to mesh
twice, including a modification of the initial (input) mesh, which
modifiers should never do!
Removed the extra useless conversion, which also gives a small
improvement in performances:
With as simple of a scene as four objects (three operands in a
collection, and the modified one) totalling 20k vertices/faces, this
commit:
* Avoids 2MB memory leak per evaluation (!).
* Speeds up boolean evaluation by 5-10%.
Found while investigating some production files of the Project Heist
here at the Blender Studio.
===================================================================
M source/blender/modifiers/intern/MOD_boolean.cc
===================================================================
diff --git a/source/blender/modifiers/intern/MOD_boolean.cc b/source/blender/modifiers/intern/MOD_boolean.cc
index 7581df19996..07504d91fea 100644
--- a/source/blender/modifiers/intern/MOD_boolean.cc
+++ b/source/blender/modifiers/intern/MOD_boolean.cc
@@ -518,24 +518,29 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
Mesh *mesh_operand_ob = BKE_modifier_get_evaluated_mesh_from_evaluated_object(operand_ob,
false);
- if (mesh_operand_ob) {
- /* XXX This is utterly non-optimal, we may go from a bmesh to a mesh back to a bmesh!
- * But for 2.90 better not try to be smart here. */
- BKE_mesh_wrapper_ensure_mdata(mesh_operand_ob);
+ if (mesh_operand_ob == nullptr) {
+ continue;
+ }
- bool is_flip;
- BMesh *bm = BMD_mesh_bm_create(mesh, object, mesh_operand_ob, operand_ob, &is_flip);
+ /* XXX This is utterly non-optimal, we may go from a bmesh to a mesh back to a bmesh!
+ * But for 2.90 better not try to be smart here. */
+ BKE_mesh_wrapper_ensure_mdata(mesh_operand_ob);
- BMD_mesh_intersection(bm, md, ctx, mesh_operand_ob, object, operand_ob, is_flip);
+ bool is_flip;
+ BMesh *bm = BMD_mesh_bm_create(result, object, mesh_operand_ob, operand_ob, &is_flip);
- /* Needed for multiple objects to work. */
- BMeshToMeshParams bmesh_to_mesh_params{};
- bmesh_to_mesh_params.calc_object_remap = false;
- BM_mesh_bm_to_me(nullptr, bm, mesh, &bmesh_to_mesh_params);
+ BMD_mesh_intersection(bm, md, ctx, mesh_operand_ob, object, operand_ob, is_flip);
+ /* Needed for multiple objects to work. */
+ if (result == mesh) {
result = BKE_mesh_from_bmesh_for_eval_nomain(bm, nullptr, mesh);
- BM_mesh_free(bm);
}
+ else {
+ BMeshToMeshParams bmesh_to_mesh_params{};
+ bmesh_to_mesh_params.calc_object_remap = false;
+ BM_mesh_bm_to_me(nullptr, bm, result, &bmesh_to_mesh_params);
+ }
+ BM_mesh_free(bm);
}
}
FOREACH_COLLECTION_OBJECT_RECURSIVE_END;
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