liorsturlesi Posted February 12, 2014 Share Posted February 12, 2014 Hi guy I,m having a problem of white spots on dark areas as you can see on the pic. Any ideas how to get rid of these and what can be the problem ? Thx. Link to comment Share on other sites More sharing options...
RyderSK Posted February 12, 2014 Share Posted February 12, 2014 Do you by any chance have interpolation in some material ? (does you rendering do another darker prepass during IR stage?) Interpolated light ? It's IR artifact, but it can have quite few reasons Link to comment Share on other sites More sharing options...
liorsturlesi Posted February 12, 2014 Author Share Posted February 12, 2014 Hi Juraj, No Interpolation in any of the materials... I know it's IR problem, but don't know how to solve it.. There are 2 vray planes in the room....Maybe it's not lighten enough ? Link to comment Share on other sites More sharing options...
RyderSK Posted February 12, 2014 Share Posted February 12, 2014 Try upping slightly HPSV subdivs and checking retrace threshold to avoid the light leak in upper corner. What do you mean by vray planes ? They are pure light source or light portals only ? Link to comment Share on other sites More sharing options...
liorsturlesi Posted February 12, 2014 Author Share Posted February 12, 2014 Pure light source.... Link to comment Share on other sites More sharing options...
RyderSK Posted February 12, 2014 Share Posted February 12, 2014 But I presume the spotlights and AppleMonitors have self-emmiting materials as well though no ? These get sampled according to DMC governed IR's HSPV subdivs, so maybe try lowering adaptivity amount/upping minimal amount of sample. On other note, running "convert to Vray mats" doesn't get rid of any possible non-vray material ? Link to comment Share on other sites More sharing options...
liorsturlesi Posted February 12, 2014 Author Share Posted February 12, 2014 I re-rendered it with the raytrace threshold enabled and it cleaned 95% of the stains... Thank you ! Link to comment Share on other sites More sharing options...
RyderSK Posted February 12, 2014 Share Posted February 12, 2014 I am glad that helped. Be careful with it, retrace is quite powerful but also behaves odd under various conditions. The Vray manual will tell you it will add some "small" amount of time, but it can really be double as well, mostly depending on amount of refractive materials in scene. It is not friendly with interpolated lights, in which it will multiply render times of IR pass exponentially into oblivion. I actually don't know what's the reason for that... Link to comment Share on other sites More sharing options...
liorsturlesi Posted February 12, 2014 Author Share Posted February 12, 2014 If there was any other solution...I know its a time killer. Maybe adding more light can solve it too. Link to comment Share on other sites More sharing options...
RyderSK Posted February 12, 2014 Share Posted February 12, 2014 More light sources don't improve sampling rate, while the retrace threshold forces additional samples to avoid artifacts. Upping HSPH subdivs and at same time forcing Vray to use (by adaptivty lower than Link to comment Share on other sites More sharing options...
liorsturlesi Posted February 13, 2014 Author Share Posted February 13, 2014 Well just an update, when i re-rendered it for the 2500 pix final resolution it didn't resolve the stains problem (the ceiling was solved) but not on the chairs...and it took 7 hours to render ! killer.. Link to comment Share on other sites More sharing options...
David Casenave Posted February 17, 2014 Share Posted February 17, 2014 try this one... and see what happen! Link to comment Share on other sites More sharing options...
liorsturlesi Posted February 19, 2014 Author Share Posted February 19, 2014 Thanks David Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now