artefacts in pillar

[max montana]

hi, i can`t get rid of the artefacts in the pillar in the image below.
i made it with lathe, tried to check and uncheck all checkboxes there, but the artefacts stay.
tried auto smooth on the pillar, no sucess.
the material is a simple vraymaterial without refl.
very thankfull for suggestions

[Drawehn]

Did you use irradiance map? Looks like irradiance map splotchiness to me. Try and up your settings and the HSphere subs and Interpolations samples and see whether that helps.

[kimgar]

...or could it be mesh related?

if so, i had the same issues regarding an imported mesh, a lot of tips and suggestions were made here:
http://www.chaosgroup.com/forums/vbu...t=43432&page=2

in my case nothing worked, but you might have more luck than i did

[vlado]

Is it possible that there are double faces in that area? Try setting the secondary rays bias to a small positive value (like 0.001) and see if it helps.

Best regards,
Vlado

[max montana]

thanks for your replies, and sorry for answering that late. i forgot to subscribe to the thread...(would be fine if the started threads would be subscribed automatically)
found a workaround in the meanwhile. in lathe i take 359 instead of 360 degrees and the artefacts are gone. i have no idea why the 360° cause the artefacts.

[pengo]

maybe not welded
Option weld if I correct remember is present.I suppose if u use 360 degrees and use not weld option in lathe command maybe the two faces inside the element lathed go on the same plane so artifacts are produced.
Abyway u solved but maybe for the next time could be a solution use weld to majke the inside profile that generates polygon to lathe doesn' t finish on the same plane of the last polygon rounded on vertical axes
Bye

[max montana]

will try it pengo, thanks