vray section rendering bleached out and background change

[wadecong]

 

I was trying to rendering section in sketchup, however some areas seems to bleach out and although i changed sketchup background into white, the background color turned out to be grey blue anyway. Anyone knows how to solve the problems.

[M V]

You need to up your GI settings to resolve the splotches, the bleached out areas might be able to be resolved by using HSV Exponential color mapping, and the gray background can be resolved by ticking off Affect Background under color mapping.

[wadecong]

thank you for information, I have tried what you said and it became much better, but there are still some blurring in the area, i tried to up the dark multiplier and it didn't seem to work well. Background color is changed by ticking off the background affect, the only thing i wanna know what does this menu mean?

 

Thanks a lot

Edited January 29, 2014 by wadecong

[M V]

Not sure what you mean? What menu? The entire color mapping menu or the Affect Background?

 

You can easily adjust this rendering if you open in Photoshop and adjust the curves a little.

[wadecong]

sorry for the confusion, i mean the affect background menu. besides that, how can i manipulate the color mapping to avoid the bleaching, or you mean i can do it in photoshop. thank you

[Francisco Penaloza]

I think there is a confusion here, I don't see bleach out areas here, all what I see is direct light and shadows areas, where you do not have ceiling the sun is illuminating the way it should, where is ceiling or is receded it show, in shadows, so everything is correct.

 

If you want to do a section view, do not use VRay sun at it full intensity, in my opinion do not use it at all, just use a soft indirect illumination to define areas and it will look a lot better, Dome light or something like that.

If you still want hard shadows use a direct light, and lower your intensity just enough to create some shadow areas.

[wadecong]

The black blurring floor panel is what i was talking about.

 

and i was trying indirect illuminition. I wanna know if i need to turn off GI and BG, or still select textsky without sunlight, the following pic is what i got as i turn on GI TEXTSKY without sunlight

I also rendered artificial light using rectangular light, AND it looks very rough how could i change it.