Antialiasing and twinklies - Polyloop

Jaeger · 13th February 2006, 06:41

I'm trying to render a scene with a lot of trees in it, where the camera is moving slowly back. The trees are all in the background, and they're shimmering with a bad case of the twinklies.

I know this is basically an antialiasing issue, related to there being too much detail for the output format to handle, but my experiments in trying to fix it are taking a long time, as everything I try slows down the render time.

Starting from the default "fast" photorealistic render, I've so far tried going for higher antialiasing settings, and using the depth of field option to blur the background, but I'm still getting twinklies. I'm almost at the point of switching to a static camera, but I would really like to solve this problem.

Can anyone advise on appropriate render settings without it taking forever to render? My output is supposed to be PAL format (720x576, 25fps, interleaved)

Thomas · 13th February 2006, 10:00

can you post a screenshot of the problem? thanks!

Jaeger · 13th February 2006, 10:51

It's an animation. Can I post AVI files?

Thomas · 13th February 2006, 16:18

if it's not to heavy, yes, but you can also post two-three frames as imagin in attachement.

Nichod · 13th February 2006, 21:26

Some tips as far as twinkling is concerned:

Make sure FULL RAYTRACE is on.
Set object and shadow accuracy to 2 or maybe even 1.

Jaeger · 17th February 2006, 00:15

Thanks, Nichod - that seemed to work, and it didn't slow down the rendering too much!

- Jaeger

13th February 2006, 06:41	#1 (permalink)
Jaeger Cube Join Date: Jan 2006 Posts: 62	Antialiasing and twinklies I'm trying to render a scene with a lot of trees in it, where the camera is moving slowly back. The trees are all in the background, and they're shimmering with a bad case of the twinklies. I know this is basically an antialiasing issue, related to there being too much detail for the output format to handle, but my experiments in trying to fix it are taking a long time, as everything I try slows down the render time. Starting from the default "fast" photorealistic render, I've so far tried going for higher antialiasing settings, and using the depth of field option to blur the background, but I'm still getting twinklies. I'm almost at the point of switching to a static camera, but I would really like to solve this problem. Can anyone advise on appropriate render settings without it taking forever to render? My output is supposed to be PAL format (720x576, 25fps, interleaved)

13th February 2006, 10:00	#2 (permalink)
Thomas Always learning new stuff Join Date: Jul 2002 Location: Merignac, France Posts: 11,323	can you post a screenshot of the problem? thanks! __________________ Polyloop owner & Administrator - no support by PM or email. Polyloop [EN/FR] - Meuuh [FR +16 ans] - Totyo [FR] - Pixologic [JOB] - Le ZBlog [JOB] - La3dpourlesnuls [FR]

13th February 2006, 16:18	#4 (permalink)
Thomas Always learning new stuff Join Date: Jul 2002 Location: Merignac, France Posts: 11,323	if it's not to heavy, yes, but you can also post two-three frames as imagin in attachement. __________________ Polyloop owner & Administrator - no support by PM or email. Polyloop [EN/FR] - Meuuh [FR +16 ans] - Totyo [FR] - Pixologic [JOB] - Le ZBlog [JOB] - La3dpourlesnuls [FR]

13th February 2006, 21:26	#5 (permalink)
Nichod Moderator Join Date: Apr 2005 Posts: 612	Some tips as far as twinkling is concerned: Make sure FULL RAYTRACE is on. Set object and shadow accuracy to 2 or maybe even 1. __________________ Email Me. Visit my blog! Get hundreds of shader presets! Get Art of Shaders! And a preview for Art of Skin is now available. AMD Turion(TM) 64 ML-40 (2.2GHz/1MB L2 Cache) 1280 MB DDR 333mHz RAM 128MB ATI RADEON(R) XPRESS 200M w/Hypermemory(TM) 60 GB 4200 RPM Hard Drive DVD+/-RW/R & CD-RW Combo w/Double Layer Support 15.4" WXGA BrightView Widescreen (1280x800) I use.

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13th February 2006, 10:51	#3 (permalink)
Jaeger Cube Join Date: Jan 2006 Posts: 62	It's an animation. Can I post AVI files?

17th February 2006, 00:15	#6 (permalink)
Jaeger Cube Join Date: Jan 2006 Posts: 62	Thanks, Nichod - that seemed to work, and it didn't slow down the rendering too much! - Jaeger