Blender freezes to infinite loop when switching to PAUSED Cycles rendered viewport #41197

New Issue

Maverick · 2014-07-26T19:09:59+02:00

Maverick commented

2014-07-26 19:09:59 +02:00

System Information
win64 gtx titan i7

Blender Version
blender-2.71-f37ec65-win64-vc9

Short description of error
This happens all the time but when working on large projects it freezes Blender indefinitely.
Heavy scene (5k+ objects, 10M+ tris) containing fluid sim for example.

The rendered viewport is paused from a previous switch (viewport is now in solid mode).
Trying to switch from solid to rendered freezes blender IF THE PAUSED option was previosuly enabled.

Cannot attach a sample file because it must be really big.

Thank you

**System Information** win64 gtx titan i7 **Blender Version** blender-2.71-f37ec65-win64-vc9 **Short description of error** This happens all the time but when working on large projects it freezes Blender indefinitely. Heavy scene (5k+ objects, 10M+ tris) containing fluid sim for example. The rendered viewport is paused from a previous switch (viewport is now in solid mode). Trying to switch from solid to rendered freezes blender IF THE PAUSED option was previosuly enabled. Cannot attach a sample file because it must be really big. Thank you

Maverick commented

2014-07-26 19:09:59 +02:00

Changed status to: 'Open'

Maverick commented

2014-07-26 19:09:59 +02:00

Added subscriber: @dragostanasie

Maverick commented

2014-07-26 23:49:38 +02:00

Note: this should not be fixed switched by auto-unpausing of the rendered viewport for the following reason:

Blender remembers the state of the 3d view.

So if you are in the Node Editor (for example) and you decide to switch to the 3d view,
(which was forgotten in rendered mode)
then there is the risk of Blender crashing by running out of memory.

This happens often when you work close to your memory limit or the Undo buffer is full.

Note: this should not be fixed switched by auto-unpausing of the rendered viewport for the following reason: Blender remembers the state of the 3d view. So if you are in the Node Editor (for example) and you decide to switch to the 3d view, (which was forgotten in rendered mode) then there is the risk of Blender crashing by running out of memory. This happens often when you work close to your memory limit or the Undo buffer is full.

Sergey Sharybin commented

2014-07-28 12:54:14 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2014-07-28 12:54:14 +02:00

Not really sure what does it mean "freezes"? Here rendered viewport just stays on pause and once the pause is removed blender starts rendering just nice.

If you're experiencing different behavior please attach as small .blend file as possible.

Not really sure what does it mean "freezes"? Here rendered viewport just stays on pause and once the pause is removed blender starts rendering just nice. If you're experiencing different behavior please attach as small .blend file as possible.

Maverick commented

2014-07-28 14:55:29 +02:00

@Sergey: you need a production scene, something with heavy geometry, parenting, caches, particles, smoke

My wild guess is that blender does some kind of refresh to the UI which needs to process the depsgraph but it sends another one before it can end the first one.
So it gets stuck in a loop, the UI no longer responds, under Windows the entire UI turns white, so it is frozen. You can only kill the blender process.

My current file is 1GB large and is under NDA for a client.
If you cannot replicate it I will try to make a custom blend but not sure how I will attach it.

@Sergey: you need a production scene, something with heavy geometry, parenting, caches, particles, smoke My wild guess is that blender does some kind of refresh to the UI which needs to process the depsgraph but it sends another one before it can end the first one. So it gets stuck in a loop, the UI no longer responds, under Windows the entire UI turns white, so it is frozen. You can only kill the blender process. My current file is 1GB large and is under NDA for a client. If you cannot replicate it I will try to make a custom blend but not sure how I will attach it.

Maverick commented

2014-07-28 14:57:33 +02:00

Heavy scene --> switch to rendered mode --> pause the viewport --> change to a different viewport (text editor for example) ---> switch back to 3d viewport (which is now in paused rendered mode) --> freeze