Roodogg Posted June 18, 2012 Share Posted June 18, 2012 (edited) Hi guys, I am having a strange problem ONLY when rendering a large image (2500px wide or more). When region rendering the area or rendering a small preview (1000px or less), it renders fine. The attached 2 images highlight the problem, 1st image: weird sampling issues on the left hand side and occasionally, one or two of the downlight shapes on the wall are overbright and blotchy. 2nd image (created by region rendering) is rendering fine. Please excuse the lack of AA, I wanted to get this on the forum quickly, hoping for a fix. Settings are, gamma 2.2 workflow, IR map medium, Lightcache 2000 erco ies file for downlightsts (I have tried others and the problem persists). Many thanks in advance for reading and any help. Edited June 18, 2012 by Roodogg Link to comment Share on other sites More sharing options...
Corey Beaulieu Posted June 18, 2012 Share Posted June 18, 2012 That looks like an Irr issue to me. What are your settings? I've had different trouble with Irr's before where reducing the resolution was a solution. Link to comment Share on other sites More sharing options...
Roodogg Posted June 18, 2012 Author Share Posted June 18, 2012 Thaks for the reply... Pretty standard IR settings. And I'm setting everything quite high in general (global subdivs multiplier is 10). It happens with medium, high. I have tried increasing the HSph Subdivs, 50, 80, 100 Why on earth would it only happen when I am rendering the whole image, thats whats puzzling me! As I said, rendering smaller or region rendering is not a problem!! Link to comment Share on other sites More sharing options...
Corey Beaulieu Posted June 18, 2012 Share Posted June 18, 2012 Well I would keep messing around with the Irr settings until someone who is SURE of the issue comes along. Are you upping the interpolation sample along with your HSph? You should be using at least half of the HSph number. When all else fails, just render the full view and then render the region without clearing the render frame window. You'll get the combined render in all passes as well as the main pass. (I had read your bit about the region being fine. I was thinking that as a sort of proof along with my past experience of reducing the resolution, that the problem is irradiance.) Link to comment Share on other sites More sharing options...
Roodogg Posted June 18, 2012 Author Share Posted June 18, 2012 Totally flummoxed... I just rendered it out at 2500px wide with lightcache 500 and IRR map on very low and it was fine!!! It seems, the higher I make the IRR map settings, the worse it gets. It's almost funny (If I wasn't trying to finish my portfolio!!) ...obviously with the settings so low it is no good quality-wise, but the issue is fixed Link to comment Share on other sites More sharing options...
Bruce Hart Posted June 19, 2012 Share Posted June 19, 2012 I would check the geometry of that wall. There isn't a coincident face is there? Link to comment Share on other sites More sharing options...
Roodogg Posted June 19, 2012 Author Share Posted June 19, 2012 Hey Bruce... Thanks for the input. Just checked that. Geometry is fine. Link to comment Share on other sites More sharing options...
Roodogg Posted June 19, 2012 Author Share Posted June 19, 2012 It happens when I up the light cache. Lower settings on the light cache are not a problem. As soon as I match it to the render size, I get this issue. I'll try merging all into a new scene and resetting all settings. Any more help on light cache issues would be appreciated although I've never encountered anything like this before! Link to comment Share on other sites More sharing options...
Corey Beaulieu Posted June 19, 2012 Share Posted June 19, 2012 Are you by chance using the Delone Triangulation as your Interpolation Type or Least Square fits? Link to comment Share on other sites More sharing options...
YOHKOH Posted June 26, 2012 Share Posted June 26, 2012 It may well be one of your glossy/shiny materials, most likely glass. Try turning off the bottles, or anything else which is glass. The same problem has occurred rendering out scenes with cars in. All fine at low res and then the final high res over night render returns over bright dots and splotches. Turns out it was the windshields. Link to comment Share on other sites More sharing options...
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