VRay issues!!
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Hi,
Im new to the forum, i have come to the conclusion that this is the place to find the answers to my sketchup questions... heres hoping!
I'm fairly new to sketchup and haven't got the hang of materials and rendering yet as there seems to be limited materials in the sketchup library. Having read a few peoples views on the matter i have downloaded vray... and the manual with tutorials.
I started working through the manual but even though i am setting the same settings as in the tutorials i am getting different results when i render to the ones i'm supposed to. In particular, when first turning GI on and turning default and hidden lights of i'm getting an over exposed bluey colured render with strong shadows... which seem to be reversed, ie. light where there should be shadow and shadow where there should be light. When in fact i should have a nice neutral image with very little shadow...
Anybody have any ideas on this, i want to get it right from the start so i don't learn it all wrong, thanks!!
Kat
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I had the same problems when I started, Katarina. In fact, I have yet to be convinced that those tutorials were made for SketchUp at all, they may well have been adapted from the Rhino version.
The problem is down to the default Visopt file.
Open the Render Options...the icon with the "O" label...and go to the Environment tab. Change the GI Skylight colour from pale blue to white, then click on the capital M next to it and on the panel that opens, uncheck the box saying to override the sun parameters (otherwise, the light is always coming from directly above, rather than at the angle you have set it in SU. You can turn the multiplier right down while you are about it...from 1 to maybe 0.2...then try another render. The shadows aren't reversed, it just seems that the SU sun generates a ridiculous amount of reflected light off any ground surface, whiting-out the entire render.You'll still get hard shadows if you are using the SU sun, but things ought to be a little less glaring and blue. If you get some settings that you like, you can save them using the File Menu at the top of the Options panel. From here you can also load a whole range of other presets and see how they affect the various settings and quality of render....take notes.
One quick way of getting more controllable lighting over a limited area is to place an infinite plane both at ground level (unless you already have a ground level in your model) and a copy of that plane way up in the air (to block out the SU sun). You can then pull in a V-Ray omni-directional light. This will give you more diffuse sun shadows than the SU sun. Scale the light sphere much larger, then right-click it and boost its strength maybe tenfold and see what results you get.
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Hi Alan,
Thanks for the advice, i tried adjusting the settings which didn't make too much difference (the overide sun parameters was already unchecked) but at the same time i was poking through other settings and apparently it was the camera settings causing the problems... I've turned physical camera on and the blue hue is gone, and shadows looking normal. However, i still can't get the soft look render thats in the tutorial. This sentence is bothering me...
'Compare to the image without Global Illumination, you can see the objects don't have dark shadow because the objects get light from all around.'
All my renders have dark shadows no matter what combination of options i try, i noticed you said that i would always get these if i am using the SU sun... is this a light i can turn off, im not sure what it refers to?
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Hello everybody! I'm trying to learn some vray for sketchup, but since i started using the manual i kept getting the same annoying blue hue and hard shadows as katarina. I googled for it, found this thread and tried what both of you suggested, still i couldnt get the same image as the one in the manual (pages 11 and 12). Today i finally succeeded in my efforts, so i joined the forum to share my experience.
To avoid the problem katarina described so precisely all you need is first follow the manual, then in the environment menu double click the M right of GI. Under common/type select "none" then apply. At this point the "M" becomes an "m". Do the same for background. Set white or any colour you like for GI, leave it as it is for baclground. Now you have a soft light and no more blue hue.
The chairs are still darker than the background. I think this is due to the fact that they dont have a material assigned yet. If like me you still have to learn about vray materials, you can obtain an image which is closer to the one in the manual by checking override materials in the material box under global switches and selecting white.
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