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View Full Version : Why does changing normal map bump amplitude change lighting?



unstable
08-06-2015, 06:14 PM
I thought I would try to learn how to UV map on a simple model and ran into something that I don't understand. If you look at the two images, they are exactly the same except one has the normal map set to 10% amplitude and the other has it set to 100%. But notice in the VPR that the shadow changes. At 10% you can see the chipping paint, but at 100% its in the shade. Is it supposed to work like this? Is it something I'm doing wrong? I'm using 11.6.2 on a Windows 7 machine.

JoePoe
08-07-2015, 06:17 AM
Weird !
Is your normal map set to Linear color space?

MarcusM
08-07-2015, 07:08 AM
First we must know what amplitude doing with image, working like contrast or brightness or in another way? In normal map color 128,128,255 is neutral but when you change amplitude propably you also changing this neutral color. You should use someyhing like contrast in Photoshop.

Amurrell
08-08-2015, 04:24 PM
I'm with Joe. Make sure normal maps, as well as spec, reflection, gloss, bump.... are managed in linear color space. Other things holding color information can use sRGB.