[Bf-cycles] Possible faster (x2) Viewport Border rendering complex scenes

Brecht Van Lommel brechtvanlommel at pandora.be
Sun Apr 14 22:01:09 CEST 2013

I'm not sure drawing with wireframes is the right solution, this can
still be slow. Probably it's possible to only redraw the area inside
the render border and leave the area outside unchanged, which would be
even faster. I'll look into it, we already do partial redraws for
sculpt mode so it should be possible.


On Sun, Apr 14, 2013 at 7:08 PM, David Black <db4tech at yahoo.co.uk> wrote:
> Hi Brecht,
> Possible Faster Viewport Border Rendering Complex Scenes:
> Nothing to do with my previously mentioned half resolution option for faster
> Viewport rendering.
> There may be a way to speed up viewport border rendering for complex scenes.
> While preforming some tests, I noticed on complex scenes, where only a small
> area of the viewport is selected for border rendering, there is a huge
> render speed difference dependent on what is displayed in the rest of the
> viewport presently not being rendered.  Tested in camera view with 2 GTX
> 580’s and on a Laptop with a GTX580m.
> Test Method:
> Selected a small region  (top right) of the viewport for border rendering on
> a complex scene, moved the same region around different parts of the
> viewport and noticed a huge render speed up when complex areas of the scene
> not presently being rendered are moved outside of the viewport view.
> It seems solid OpenGL drawing the rest of a complex scene while border
> region is rendering is the culprit, could having the rest of the scene draw
> in wireframe mode only, instead of solid, outside of the border render
> region provide a faster viewport border render for everyone?
> Results:
> Border render small square top right of viewport complex scene:
> 2 GTX 580 16 seconds, GTX 580m 32 seconds
> Same border region moved to bottom left of viewport:
> 2 GTX 580 5 seconds, GTX 580m 14 seconds
> Thank you for your time,
> David
> --
> 3d-designs-davidblack.blogspot.com
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