Bump Maps / Values
cosmo71
Posts: 3,609
in The Commons
Is it right that if an area on a bump map is darker it goes deeper in the render and if it is lighter it goes higher? If it is so, what can cause the opposite (values are correct, negativ -0.5 positiv +0.5)
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Comments
Your surest way to reverse the bumps is to to an inversion on the map itself. I'm not sure what Studio will do if you invert the values.
It might go with the flow, and it might tell you to perform biological impossibilities.
inverting the numbers in the surface tab works fine
Thanks, Fisty!
I wasn't sure, so I didn't want to say.
I have edited a bump map and darkend darker areas but instead of getting deeper in the render it looks like it comes more out ;(
Wouldn't that be a displacement map you are looking for and not a bump?
a bump map does nearly the same but not so roughly it depends on the map.
I know what bump maps and displacemtent maps are doing, the question is, what can cause an opposite result? I have darkend some wrinkles so the go bit deeper into the skin but instead of going deeper it seems they come out.
That should be working then. If the lighter is set to possitve and the darker is set to negative then it should be acting correctly. Is it possible that the character also has a normal map that is fighting you somehow?
have that, darkend thw wrinkles on the map and have negative value on negativ and positiv on positiv but it looks like the wrinkles are coming out and not going in.
it has a normal map but has that influence on a bump?
It will influence the negative/positive surface of the figure. There are 3 slots people use now to adjust the way the surface is raised and lowered. In Iray (for now) displacement is not great to use so for the most part it is bump and normal maps.
I use 3Delight
3Delight should handle the control maps the same as iray.
Here is the where I learned what the different maps are for http://blog.digitaltutors.com/bump-normal-and-displacement-maps/
Bump maps only give the illusion of raised and depressed spots. Depending on your lighting and camera setting that illusion could appear distorted thus tricking your eyes into seeing the effect reversed.
Something similar happened a long time ago in Poser 7... I never found out what was causing it, but I abandoned the scene and started over and for whatever reason the problem went away. The difference was in addition to being inverted, it was slightly offset and it was only on certain parts of the model. When I started over, the problem went away.
I know what bump maps do and what displacement maps do
that is exactly what I had today.
I guess I was not super clear. All 3 are used regularly in both 3DL and Iray, it is just Iray where displacement that is out of favor.
My understanding is DS using 3Delight the bump and displace read RGB values of 128 as "flat" or essentially "the zero point" in 3Delight so R 128, G 128 & B 128 values are mid gray or "no bump/displace". So a value above 128/128/128 adds to the bump/displace, and value below 128/128/128 subtracts to the bump/displace
In other rendering engines this is not necessarily the same. For instance; If you are using a bump/displace that came with a poser product the zero value is zero as in R0, G0, B0 (for Firefly, LuxRender, etc.) which when studio sees it becomes 128 levels below zero and doesn't like to be happy with that map present.
The only colours with defined meanings are black and white. Since their values are equal and opposite by default, (127.5, 127.5, 127.5) is neutral but changing the black and white values so they don't balance will change the neutral point.