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Irradiance map and resolution About Truespace Archives These pages are a copy of the official truespace forums prior to their removal somewhere around 2011. They are retained here for archive purposes only. Irradiance map and resolution // Archive: Tech Forum 1  |   Order by default Post by Emmanuel // Jan 23, 2007, 9:47am Emmanuel Total Posts: 439 The manual says that you can render small V-Ray test images, save the Irradiance map, and re-load it to render a final large image without the need to recalculate the GI effects. I am making some V-Ray pictures at 8000 x 6000 pixels, using an irradiance map from a 80 x 60 pixels test (same camera location, same lightening, same objects in the scene...) Results are weird : some wrong colors on some faces, bad shadows and lightening. I am trying to understand why. I use to often switch between Lightworks and V-Ray during shader editing. Could it be the reason for that bug ? Or is the Irradiance map somehow resolution-dependant so making a test render at 80 x 60 for a final render at 8000 x 6000 would make bad results ? Any idea ? Post by parva // Jan 23, 2007, 10:14am parva Total Posts: 822 Or is the Irradiance map somehow resolution-dependant so making a test render at 80 x 60 for a final render at 8000 x 6000 would make bad results ? dito. You can use a smaller IR map resolution but you will not have all details which is needed for a very large bitmap. At least the half of the size would be good. Means you render a bitmap at 4000*3000 and store this IR map (you don't have to render the bitmap, just wait as long as the calculation goes - the white dots/ IR passes - and if the Renderer begins to built the picture you can stop the render). Post by Emmanuel // Jan 23, 2007, 10:23am Emmanuel Total Posts: 439 dito. You can use a smaller IR map resolution but you will not have all details which is needed for a very large bitmap. At least the half of the size would be good. Means you render a bitmap in 4000*3000 and store this IR map. Ahhh ! Thanks Marcel. It sounds more logical ! Maybe we should forward this to the authors of the manual ;) Post by parva // Jan 23, 2007, 10:27am parva Total Posts: 822 yep. btw. the official vray manual is also good to understand the meaning behind the technics like Irradiance Mapping, Quasi Monte Carlo etc. vray 1.5 manual - Irradiance Mapping (http://www.spot3d.com/vray/help/150R1/render_params_advancedimap.htm) Post by TomG // Jan 23, 2007, 1:34pm TomG Total Posts: 3397 Hmm "small" should maybe say "smaller" instead - of course exactly how much smaller depends on just what sort of quality you are after etc. Half size sounds good, I bet in some cases quarter size may work. 80x60 for an 8000x6000 would indeed not have enough detail though! Let us know how the final renders turn out, would be interesting to get a comparison in a final image based on using a smaller and larger map. THanks! Tom

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