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I had this problem before, and placed it on this forum a while ago ( http://www.maxwellrender.com/forum/view ... 97&t=40301 ) and then Mihai suggested to lower the count in the bump map image window, and lower the contrast. that worked.
for this job, I respected all the above suggestions, but still I get this triangulated result.
the object is a ribbon of about 2 meters long and about 3 cm wide, and solid (rectangle with path sweep). I made a very long bump map image so that I did not need many repeats. I also hit the recalc button, changed the smooth factor in both directions, flipped the normals, no luck. I tried normal mapping, but with similar result.

what else can i do to avoid this effect?



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What is the bump value in the material?

Bubbaloo wrote:What is the bump value in the material?

I tried with 1 up to 100 %, it is always there, the artefacts.

It always happens to me with very dense bump with too high bump value. Try lowering the bump amount even below 1 until the artifacts disappear. Maybe it will work.

are you try to select the object than increase Smoothing + Recalc

If that is thinSSS, it will always have those triangles... you can reduce them, but thinSSS shows those artifacts more than other material types.

Best,
Jason.

ok, it is not thinSSS, just a plain color with a bumpmap, I increased the smoothing, decreased the smoothing and recalced more than I would want to, and I tried to lower the bump below 1 percent, and indeed, the artefacts disappear, but the bump disappears too and that is the whole point. I want bump, it is a ribbon and it must look like a ribbon, a ribbon is a monochrome object with an uneven surface, one cannot replace that with an image map, since the reflections change if the light direction changes. I also add anisotropy for that, but with or without anisotropy, the triangular artefacts remain.

for the record: alignment of the normals has been taken care of, they all point outwards.

thanks
wim

Convert your bump map to a normal map and try.

Mihai wrote:Convert your bump map to a normal map and try.

I tried that, same result, slightly different, but just as disturbing.

wkr
wim

Could you PM this scene please? With any maps included too.

Thanks for the scene, this problem has already been fixed in V3.