particles disappear after rendering #40403

New Issue

S S · 2014-05-28T08:29:17+02:00

S S commented

2014-05-28 08:29:17 +02:00

System Information
Windows 7 64bit, GTX 660ti

Blender Version
Broken: 2.70 64bit 06a05e4, 2.70a
Worked: haven't found

Short description of error
I don't know whether it's a bug. I create a particle system, and set it to render as object. Then after rendering, the particles system disappear in the viewport.

Exact steps for others to reproduce the error
1, open the file
2, just hit F12 to render
3, after rendering press Esc to go back to 3D view editor. Then you will find the particles disappear.

File:particles_bug.blend

**System Information** Windows 7 64bit, GTX 660ti **Blender Version** Broken: 2.70 64bit 06a05e4, 2.70a Worked: haven't found **Short description of error** I don't know whether it's a bug. I create a particle system, and set it to render as object. Then after rendering, the particles system disappear in the viewport. **Exact steps for others to reproduce the error** 1, open the file 2, just hit F12 to render 3, after rendering press Esc to go back to 3D view editor. Then you will find the particles disappear. File:[particles_bug.blend](https://archive.blender.org/developer/F91687/particles_bug.blend)

S S commented

2014-05-28 08:29:17 +02:00

Changed status to: 'Open'

S S commented

2014-05-28 08:29:17 +02:00

Added subscriber: @b1657022405

Campbell Barton commented

2014-05-28 10:18:50 +02:00

Added subscriber: @ideasman42

Campbell Barton commented

2014-05-28 10:18:50 +02:00

Note:

If the text is visible in the viewport, this works properly.
Issue is caused by render calling BKE_object_free_derived_caches on Text
Returning to the viewport Text remains without valid ob->curve_cache and ob->bb is NULL.
Attempting to add a data relation to the depsgraph build_dag_object fixed the 3d view and breaks rendering.

Tested this, though not sure its correct.

   diff --git a/source/blender/blenkernel/intern/depsgraph.c b/source/blender/blenkernel/intern/depsgraph.c
   index 2157909..7ff0e1e 100644

     - a/source/blender/blenkernel/intern/depsgraph.c

   +++ b/source/blender/blenkernel/intern/depsgraph.c
   @@ -752,6 +752,8 @@ static void build_dag_object(DagForest *dag, DagNode *scenenode, Scene *scene, O
    				dag_add_relation(dag, node, node2, DAG_RL_OB_OB, "Particle Object Visualization");
    				if (part->dup_ob->type == OB_MBALL)
    					dag_add_relation(dag, node, node2, DAG_RL_DATA_DATA, "Particle Object Visualization");
   +				else
   +					dag_add_relation(dag, node2, node,  DAG_RL_OB_DATA, "Particle Object Visualization");
    			}
    
    			if (part->ren_as == PART_DRAW_GR && part->dup_group) {

Note: - If the text is visible in the viewport, this works properly. - Issue is caused by render calling `BKE_object_free_derived_caches` on `Text` - Returning to the viewport `Text` remains without valid `ob->curve_cache` and `ob->bb` is NULL. - Attempting to add a data relation to the depsgraph `build_dag_object` fixed the 3d view and breaks rendering. Tested this, though not sure its correct. ``` diff --git a/source/blender/blenkernel/intern/depsgraph.c b/source/blender/blenkernel/intern/depsgraph.c index 2157909..7ff0e1e 100644 ``` - a/source/blender/blenkernel/intern/depsgraph.c ``` +++ b/source/blender/blenkernel/intern/depsgraph.c @@ -752,6 +752,8 @@ static void build_dag_object(DagForest *dag, DagNode *scenenode, Scene *scene, O dag_add_relation(dag, node, node2, DAG_RL_OB_OB, "Particle Object Visualization"); if (part->dup_ob->type == OB_MBALL) dag_add_relation(dag, node, node2, DAG_RL_DATA_DATA, "Particle Object Visualization"); + else + dag_add_relation(dag, node2, node, DAG_RL_OB_DATA, "Particle Object Visualization"); } if (part->ren_as == PART_DRAW_GR && part->dup_group) {

blender-admin commented

2014-05-28 11:28:52 +02:00

This issue was referenced by 6bb459f6d7

This issue was referenced by 6bb459f6d7574d5cbe1ed9ad3470b5a802c3f843

Sergey Sharybin commented

2014-05-28 11:29:44 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2014-05-28 11:29:44 +02:00

@ideasman42, the change is incorrect, it adds a dependency cycle.

Sergey Sharybin commented

2014-05-28 11:30:21 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2014-05-28 11:30:21 +02:00

Sergey Sharybin commented

2014-05-28 11:30:21 +02:00

Closed by commit 6bb459f6d7.

Closed by commit 6bb459f6d7.

Lukas Tönne commented

2014-05-28 11:39:22 +02:00

Added subscriber: @LukasTonne

Lukas Tönne commented

2014-05-28 11:39:22 +02:00

Just a note: This may fix the curve cache issue, but eventually we have to get rid of that bogus dependency. Using a depsgraph hack to fix a design error in Blender Internal can't be the right thing to do ...

Lukas Tönne commented

2014-05-28 11:41:25 +02:00

Specifically, this section is never entered in BI code when using the correct dependency.
https://developer.blender.org/diffusion/B/browse/master/source/blender/render/intern/source/convertblender.c;5a7b049a940bc120c5e9734f3ae2545c8ccc93f0$4990

Specifically, this section is never entered in BI code when using the correct dependency. https://developer.blender.org/diffusion/B/browse/master/source/blender/render/intern/source/convertblender.c;5a7b049a940bc120c5e9734f3ae2545c8ccc93f0$4990

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particles disappear after rendering #40403