Bump map trouble

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dag
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Joined: Tue Feb 02, 2010 2:28 am

Bump map trouble

Post by dag » Thu Feb 04, 2010 4:27 pm

I'm not sure if this is a blendigo issue, but I'm trying to make a wheel, and have some weird issue with the bump map.
I've made a quick mesh from scratch with the same problem.

Blender 2.49a (same with b), blendigo 2.3.1, indigo 2.2.

Blend: http://www.home.no/faenskap/wtf.blend
Bump map: http://www.home.no/faenskap/yokobump.png

What the fish is going on? Check the attachments.
Attachments
subd.jpg
With subd enabled in blendigo, ok except some bump map weirdness.
subd.jpg (360.26 KiB) Viewed 2850 times
disp.jpg
With displacement map, looks funky too.
disp.jpg (402.59 KiB) Viewed 2850 times
bump.jpg
With bump map.
bump.jpg (436.91 KiB) Viewed 2851 times
nobump.jpg
Render without bump map, all ok.
nobump.jpg (401.56 KiB) Viewed 2853 times
wire.png
Wire, highlighted faces is UV layout.
wire.png (66.43 KiB) Viewed 2852 times

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Meelis
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Location: Estonia

Re: Bump map trouble

Post by Meelis » Thu Feb 04, 2010 11:41 pm

Displace is too strong, set it maybe 0.001 - 0.002 or soo (= 1 - 2 mm for font),
and displace needs mutch higher geometry, subdivide displaced area.

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benn
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Re: Bump map trouble

Post by benn » Fri Feb 05, 2010 12:05 am

Increase the subdivision parameter for the displacement channel.

I cant remember how to do that - but hopefully Soup or Dougal will pop in here..

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dag
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Re: Bump map trouble

Post by dag » Fri Feb 05, 2010 3:32 am

The point was to show what happens to the rest of the mesh, not the displacement.
I'm talking about the weird pattern when using only the bump map.
Every face gets a circle on it when rendered.

Here's some high geometry renders.
Blender modifiers applied.
Subd smoothing off in blendigo.
Attachments
wire2.jpg
Wire with UV layout.
wire2.jpg (400.19 KiB) Viewed 2766 times
bump2.jpg
Bump at 2mm. Same sized circle pattern.
bump2.jpg (308.79 KiB) Viewed 2765 times
disp2.jpg
Displacement .006, corner smooth. Probably not enough faces for this texture, but should it affect faces outside UV layout?
disp2.jpg (302.28 KiB) Viewed 2765 times

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Meelis
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Location: Estonia

Re: Bump map trouble

Post by Meelis » Fri Feb 05, 2010 5:51 am

:? This pattern goes like 1 per 1 face.

What if u lower bump value <b>0.0001</b> <b>0.001</b>
Is the bump over sides or the whole tire, is there multible materials for same faces (under F9), delete those what's not assigned.

Is the object scale 1 (Ctrl+A in OB mode)

Silmä
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Re: Bump map trouble

Post by Silmä » Fri Feb 05, 2010 6:01 am

I think blenders default uv-mappping is to have full image for each quad. As you haven't uv-mapped the rest of the tire, each quad has the whole circular bump-map you've made for the side.

You'll need to unwrap the whole tire to get rid of those circles.

Here's an example
Attachments
2.jpg
2.jpg (822.88 KiB) Viewed 2742 times
1.jpg
1.jpg (531.75 KiB) Viewed 2743 times

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dag
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Re: Bump map trouble

Post by dag » Fri Feb 05, 2010 6:15 am

Ok, that's it.
I forgot that I deleted one of the materials to try with only one on the whole tire, without unwrapping the whole thing, then updated blendigo, then wasted a whole day on this, then.... :oops:

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