braddewald Posted March 11, 2011 Share Posted March 11, 2011 The Situation: I have a simple scene set up--a square room with a window, illuminated by a VraySun and VraySky. Everything looks just the way I want it to. The Problem: The sunlight is coming through the window and creating a huge square patch of sunlight on the floor. I want to remove that square patch of light without changing the illumination that it is providing. Is it possible? (If there is a way to do it in photoshop using some blending mode and a vrayrenderelement, that would work too). I want to be able to switch back and forth between one image with and one without that patch of light without seeing any other changes to any of the other pixels in the image. I know it's kind of an odd problem to have, but I'd really appreciate some help. Thanks in advance. Link to comment Share on other sites More sharing options...
Ricardo Eloy Posted March 11, 2011 Share Posted March 11, 2011 Have you tried the new Light Select render element? Link to comment Share on other sites More sharing options...
braddewald Posted March 11, 2011 Author Share Posted March 11, 2011 Unfortunately I'm still on vray 1.5 sp4a Link to comment Share on other sites More sharing options...
Crazy Homeless Guy Posted March 11, 2011 Share Posted March 11, 2011 I am sure there are other ways, but it would work if the sun were shooting through a glass. If so, you could calculate the GI passes and save them for use in the final render. Then in the glass material rollout untick effect shadows. This will keep the suns rays from passing in, but still give you the same GI pollution that you had when the suns rays were passing in. This will work because direct light rays are not baked into the light solution, then light solution is more or less the GI light which is effected by the direct rays after they reflect off of their first surface. Or something like that. Link to comment Share on other sites More sharing options...
braddewald Posted March 11, 2011 Author Share Posted March 11, 2011 Great idea, Travis. I'll give it a shot tomorrow. Link to comment Share on other sites More sharing options...
Ismael Posted March 11, 2011 Share Posted March 11, 2011 This is how I did it... Create Daylight System/Change to VraySun and accept VraySky in environment. Turn OFF the VraySun. Create VrayLight at window, no portal just plane at window. Create a new VraySun at the same location of the first and change intensity multiplier to .1 The VrayLight at the window ended at a multiplier of 65. How was this number obtained? By doing a False Color render on the original Sun and Sky; then turning Sun off and adjusting lVrayLight until the same average illumination was obtained. The final Sun low value actually caters to the excellent range of the average human Eye balls.... Link to comment Share on other sites More sharing options...
notamondayfan Posted March 15, 2011 Share Posted March 15, 2011 Those are funny looking teapots!? Link to comment Share on other sites More sharing options...
Nic H Posted March 15, 2011 Share Posted March 15, 2011 would do it travis way - or rebuild your scene from render elements and not use direct light (if you only have a sun) Link to comment Share on other sites More sharing options...
Ismael Posted March 15, 2011 Share Posted March 15, 2011 What ever became of this issue? I did not get these conditions met with Travis's suggestion, "I want to be able to switch back and forth between one image with and one without that patch of light without seeing any other changes to any of the other pixels in the image." Bradley? Link to comment Share on other sites More sharing options...
Crazy Homeless Guy Posted March 15, 2011 Share Posted March 15, 2011 I did not get these conditions met with Travis's suggestion. I ran a quick test. It worked perfectly as expected. Link to comment Share on other sites More sharing options...
Ismael Posted March 16, 2011 Share Posted March 16, 2011 (edited) Travis, I did not get your results. I am sure that I am going to try again what you said but in the mean time could you please post two images. Tried every way to render "From File" but I could never get The results Travis gets with what I get. There is a huge difference in pixels in one set. So yeah, post some images please. Edited March 16, 2011 by Ismael Add information Link to comment Share on other sites More sharing options...
Crazy Homeless Guy Posted March 17, 2011 Share Posted March 17, 2011 Here are the test results that I had. Link to comment Share on other sites More sharing options...
Ismael Posted March 17, 2011 Share Posted March 17, 2011 Travis, That is just an excellent result! I shared how I did it but did not understand, apparently, what you described to do. If you find some time, could you please elaborate on what you did? Thanks Link to comment Share on other sites More sharing options...
Crazy Homeless Guy Posted March 18, 2011 Share Posted March 18, 2011 If you find some time, could you please elaborate on what you did? Here is a quick screen capture video... http://www.phase22.com/misc/cgarchitect/GI_w_No_Direct_Rays.wmv Link to comment Share on other sites More sharing options...
Ismael Posted March 18, 2011 Share Posted March 18, 2011 Travis, Thank you for the demo. I finally figured out my puzzlement! The VrayLight which I had placed on the window, for me to get the same results as you, I needed to calculate the lighting with a check on "store with irradiance map". It appears that the direct Sun contributions are otherwise and by default always stored with irradiance. Link to comment Share on other sites More sharing options...
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