Cycles material preview unnecessarily re-rendering #45317

New Issue

James W · 2015-07-05T06:10:37+02:00

James W commented

2015-07-05 06:10:37 +02:00

The material preview for Cycles will re-render whenever the window focus is switched (OS window that is, not Blender editor window), and whenever the focused window is moved or resized.

For example, if I have a file manager window in focus above Blender, the preview will re-render when I move the file manager window or switch focus back to Blender (or some other program). IMO this behaviour is incorrect, and the preview should only re-render when the material is changed, or the size of the preview panel changes (i.e. when resizing the properties window).

Tested with 631b53b (self built), on Fedora 22, running Openbox. Also tested on 2.75 RC1.

The material preview for Cycles will re-render whenever the window focus is switched (OS window that is, not Blender editor window), and whenever the focused window is moved or resized. For example, if I have a file manager window in focus above Blender, the preview will re-render when I move the file manager window or switch focus back to Blender (or some other program). IMO this behaviour is incorrect, and the preview should only re-render when the material is changed, or the size of the preview panel changes (i.e. when resizing the properties window). Tested with 631b53b (self built), on Fedora 22, running Openbox. Also tested on 2.75 RC1.

James W commented

2015-07-05 06:10:37 +02:00

Changed status to: 'Open'

James W commented

2015-07-05 06:10:37 +02:00

Added subscriber: @JamesNZ

Aaron Carlisle commented

2015-07-05 17:42:40 +02:00

Added subscriber: @Blendify

Aaron Carlisle commented

2015-07-05 17:42:40 +02:00

I think the node editor needs to have canvas awareness if I'm correct before this is possible

Sergey Sharybin commented

2015-07-06 10:37:31 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-07-06 10:37:31 +02:00

@Blendify, this is nothing to do with canvas. Materials doesn't even have canvas to begin with..

@JamesNZ, i can not reproduce the issue here on Debian Jessie, running KDE tho.

Does it happen with any .blend file?
Does it happen with official 2.75 release from download.blender.org?
Does it happen on every focus change?
What are exact steps of making blender do to unnecessary re-render?
Does it happen with every window draw method (User Preferences -> Window Draw Method)?
Do you have any desktop effects which might interfere with this?

@Blendify, this is nothing to do with canvas. Materials doesn't even have canvas to begin with.. @JamesNZ, i can not reproduce the issue here on Debian Jessie, running KDE tho. - Does it happen with any .blend file? - Does it happen with official 2.75 release from download.blender.org? - Does it happen on every focus change? - What are exact steps of making blender do to unnecessary re-render? - Does it happen with every window draw method (User Preferences -> Window Draw Method)? - Do you have any desktop effects which might interfere with this?

James W commented

2015-07-06 11:14:10 +02:00

@Sergey,

Yes, including the default cube.
Yes.
Yes, except when Blender is minimized.
Open Blender, switch to Cycles, show the material preview, and open some other program to change focus (AFAICT it doesn't happen with BI).
Yes, I just tried them all.
Nope, it's just vanilla Openbox.

EDIT: Just tested this on Gnome 3, and it doesn't happen. Perhaps it's Openbox specific or something?

@Sergey, - Yes, including the default cube. - Yes. - Yes, except when Blender is minimized. - Open Blender, switch to Cycles, show the material preview, and open some other program to change focus (AFAICT it doesn't happen with BI). - Yes, I just tried them all. - Nope, it's just vanilla Openbox. EDIT: Just tested this on Gnome 3, and it doesn't happen. Perhaps it's Openbox specific or something?

Campbell Barton was assigned by Sergey Sharybin

2015-07-06 13:31:20 +02:00

Sergey Sharybin commented

2015-07-06 13:31:20 +02:00

Added subscriber: @ideasman42