tomaspayani Posted February 11, 2014 Share Posted February 11, 2014 Hi, Im currently rendering an interior scene with door that are suppose to have frosted glass on them. The problem im having is that the light reflected in this is really blotchy. Ive tried some different setups but nothing seems to fix my problem. The glass is modeled as a box with arch design thick geometry as a starting point. The settings for the frosted glas is: 0,65 diffuse white colour, 1 reflectivity with 0,6 glossiness (here i have tried interpolation, highlights +fg only, interpolation on and off and samples ranging from 8-300 without any luck). 0.75 transparency with 0.5 glossiness (tried with and without interpolation, glossy samples from 8 - 260) using IOR 1.5 as im using FG and GI i thought it might have been the rays spooking around, i lowered the GI rays to 50 and bumped up the FG to 10,000 but still no sign of improvement. The lights are on 20,000 photons per light. Gi is set to optimize for FG. The lights are photometric with an IES profile and shadow samples of anywhere between 8-260 still no change. Ive tried rendering on higher resolutions but the problem still remains.. have i missed something obvious? do i need to bump the glossy reflections precision up? i have been told never to change it from 1.0x default.. any ideas are appreciated, image of the problem below! Link to comment Share on other sites More sharing options...
Nic H Posted February 11, 2014 Share Posted February 11, 2014 not sure in MR but in vray its called 'retrace threshold' Link to comment Share on other sites More sharing options...
thorsten hartmann Posted February 11, 2014 Share Posted February 11, 2014 hi this is your reflection samples of specular reflection from the IES-Light. My trick is: set of specular from the IES, and use Surface for the Light reflection. here a workflow for you that explain your problems: http://www.infinity-vision.de/page/su_workflow If you want use a cutoff Treshold alá Vray, switch from 32 Frame Buffer to 16Bit Framebuffer. That is the same in Vray, but not good for the postproduction. Link to comment Share on other sites More sharing options...
tomaspayani Posted February 11, 2014 Author Share Posted February 11, 2014 im rendering at work so installing third party applications is shamefully prohibited. i tried going to 16 bit frame buffer, but that didnt help either unfortunatley. the tinkering continues! Link to comment Share on other sites More sharing options...
tomaspayani Posted February 11, 2014 Author Share Posted February 11, 2014 worked it out by increasing the refraction glossieness. If i want it lower ill sort it out postprod, thanks for your help Link to comment Share on other sites More sharing options...
erkutacar Posted February 14, 2014 Share Posted February 14, 2014 here is material and how it looks for u.. that render is with default settings Link to comment Share on other sites More sharing options...
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