Playing slowness #26965

Closed
opened 2011-04-16 16:02:35 +02:00 by Moolah Nasreddin · 5 comments

%%%winXP SP3 32 bit, Blender 2.57, r36185

I got the strange situation:

baked physics and tried to pla it - it gives really slow playback.

toDo:

  1. Play - you'll notive how it's slow.
  2. Move object "ground" to another layer
  3. Try to play now - it's almost normal already
  4. Try to rewind the animation by the pointer - it's even faster.

The slowness is compareable to baking times by which I can suppose that it's linked with the Collision modifier somehow.

This issue is cruicial for me because I can't edit a camera movement efficiently in such animations.

Also I want to poke a bit for another bug http://projects.blender.org/tracker/index.php?func=detail&aid=26915&group_id=9&atid=498
that was marked as Rejected but I found another proofs. I hope this isn't a problem.%%%

%%%winXP SP3 32 bit, Blender 2.57, r36185 I got the strange situation: baked physics and tried to pla it - it gives really slow playback. toDo: 1. Play - you'll notive how it's slow. 2. Move object "ground" to another layer 3. Try to play now - it's almost normal already 4. Try to rewind the animation by the pointer - it's even faster. The slowness is compareable to baking times by which I can suppose that it's linked with the Collision modifier somehow. This issue is cruicial for me because I can't edit a camera movement efficiently in such animations. Also I want to poke a bit for another bug http://projects.blender.org/tracker/index.php?func=detail&aid=26915&group_id=9&atid=498 that was marked as Rejected but I found another proofs. I hope this isn't a problem.%%%

Changed status to: 'Open'

Changed status to: 'Open'
Member

%%%Janne, can you investigate this case? Thanks!%%%

%%%Janne, can you investigate this case? Thanks!%%%
Member

%%%The problem is that the collision objects you're using have (together they have over 100000 faces!). After the simulation is baked the actual collision calculations aren't done any more, but the collision data structures are still updated for every frame. With so many faces this data structure update takes quite a bit of time, so you get slow playback even with baked dynamics.

This issue is on the todo-list (disable collision data structure updates after physics are baked), but it's not a totally easy one as different simulations can have different dependencies on the collision objects. Before this issue is fixed properly you have modify your scene a bit in order to achieve proper playback speeds.

This is First of all I suggest you create simpler objects that you use for collisions (for example just changing the order of modifiers in the Plane.001 object so that the collision modifier is before the subsurf modifier will already give you some speed boost). You should also create a lower resolution version of the ground object and use only that for collisions. Alternatively you can just delete the collision modifiers after baking to speed up the playback.%%%

%%%The problem is that the collision objects you're using have (together they have over 100000 faces!). After the simulation is baked the actual collision calculations aren't done any more, but the collision data structures are still updated for every frame. With so many faces this data structure update takes quite a bit of time, so you get slow playback even with baked dynamics. This issue is on the todo-list (disable collision data structure updates after physics are baked), but it's not a totally easy one as different simulations can have different dependencies on the collision objects. Before this issue is fixed properly you have modify your scene a bit in order to achieve proper playback speeds. This is First of all I suggest you create simpler objects that you use for collisions (for example just changing the order of modifiers in the Plane.001 object so that the collision modifier is before the subsurf modifier will already give you some speed boost). You should also create a lower resolution version of the ground object and use only that for collisions. Alternatively you can just delete the collision modifiers after baking to speed up the playback.%%%
Member

Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'

%%%Thank you Janne! Very good advices!%%%

%%%Thank you Janne! Very good advices!%%%
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Reference: blender/blender#26965
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