[tok]

Hi, a probably pretty simple question: I create a simple cylinder with Sketchup and export it into Studio. If I now apply a material without any texture the cylinder renders quite smoothly, but as soon as I add a texture to the material the cylinder gets a hard edged shadow. (Physical Sky.) How can I avoid that?

Thank you!



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[macray]

I'm sure the texture is not a gradient with cylinder mapping? So the brightest and darkest point are next to each other?

otherwise i have no explanation for this.

[firebird]

does your material have normal mapping applied to it?

I experienced this shadow problem with normal mappings! But don´t ask me how I solved it. It´s quite a while ago.

I look through my mterials maybe I find something.

[KurtS]

try to reverse the normals and see what happens...

[simmsimaging]

Is there a bump map on this? It looks like the old bump map /smoothing problem. If so try the Think! site and check for Tom's tutorial on bump mapping - it will help.

If not then I have no idea

b

[Micha]

Could be a self shadowing problem. Try the same for a cylinder with very high poly count.

[tok]

Thanks a lot for your hints! I tried everything, still could not fix the defect. This is the bump map I used; anything wrong with it?



Tiles nicely on big walls, by the way.

[firebird]

could you somehow post your material settings (screenshot or so)

[tok]

Of course I tried very many settings by now. These are the basic ones (too simple?). Normals and polys should be ok, I think.

[firebird]

The only thing that works o.k. is displacementmapping



but I couldn´t get rid of the edges and its only a third of renderspeed.


normal mapping aswell as bump mapping seem to have this hard edge problem if you get over a certain "bump value" depending on your say height amount information in your map.

so far

[tok]

Pretty plastically! Which settings did you use?

[firebird]

I just added the displacement layer, loaded your bump map, height was 0,5, offset -0,5 , precision set to adaptive.

that´s it.

[tom]

Do you tile the map using UV or texture tile option? You can send me the scene.

[tok]

Thanks for offering your help, Tom. I did not know how to send you the file, so I put it here: http://downloads.virch.net/.

[tom]

I think it's a problem with sunlight. Did you try with emitter? Also what happens when you add more horizontal segments to your cylinder?