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View Full Version : BUMP ? back to the drawing board ...


Luigiserena
02-17-2009, 03:01 AM
i did some zbrush tests and after hours and hours of testing i ended up with verrrrry simple model of my broblem and here it is :

this is texture i used on simple plane
its 16bit-grayscale-png used with mentalray in maya (on production settings)

http://img403.imageshack.us/img403/5285/texturejj8.th.png (http://img403.imageshack.us/my.php?image=texturejj8.png)

when its rendered i end up with this:

http://img100.imageshack.us/img100/2606/renderyg6.th.jpg (http://img100.imageshack.us/my.php?image=renderyg6.jpg)

upper part of texture is linear black to white gradient which should have 65k steps of gray
bottom part is "leveled" to 1/3 of upper gradient which should have aprox 21k steps of gray ... and whats clearly visible is that theres like 100 steps on bottom one

so i realized that i obviously dont understand some part of all this cause i get results like im using 256color images ...

1armedScissor
02-18-2009, 12:22 AM
what bit depth are you rendering to though.

mister3d
02-18-2009, 01:59 AM
I'm not sure how it works in maya and why the bug happens, but such bitmaps as bump, normal bump and displacement should be loaded as linear(with gamma 1.0). In max you set this manually into the loading window.

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02-18-2009, 01:59 AM
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