Bump mapping help
Hi,
just been experimenting with bump maps before starting for real. On my grey base image in photoshop, if I paint one white stripe and one black, in my renders, the white one appears sunken in, but the black one has no effect at all. Have I got a setting wrong? thanks, gubar. |
if youve got the grey set to mid greay then you need to change the colour gain to -0.5 in the file node
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Hi,
do you mean the alpha gain? I've tried altering it, and the alpha offset values. It makes a difference to how the white is rendered, but the black still has no effect. cheers, gubar. |
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Ok, just tried it with a new scene and it is working now. Don't know why it wasn't in the previous scene.
Another question if I may - even using a fairly high resolution texture (1024 x 1024), after I blur my lines (to fade in and out of the shadow, I'm trying to do some inner chest muscles), the bumpstarts to look pixelated when I render. Are there any ways to avoid this, or are normal maps a better solution? I'm hoping there's a way to sort the bumps, since I've not looked at normal mapping yet. thanks, gubar. Here's an image to show you what I mean: |
No one able to advise on this bump mapping issue? Could it be that bumps are only suited to small wrinkles and creases, and not larger bumps?
thanks, gybar |
for something like that I would probably use a displacement map. as it looks loke your trying to get a lot out of the bump map.
I only use bumps for small/medium things, wood grain on a table top, brick textures etc etc. A bump map alters the normal to make it look displaced where a diaplacement map actually creates geometry to give the detial. You could try saving your map as a 2048 and give that ago to see if its any different. |
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