Faceting Problem.

[blowlamp]

I'm a new user and just playing with Octane beta 3.03 at the moment. I saw that there was a problem with the import of vertex normals a while ago and I repeated the test that was carried out at the time, so I'm assuming this is the problem that I'm seeing.

I attach one picture (Capture.jpg), that shows the obj export settings from my CAD program, which is ViaCAD Pro v7. The next rendered image (Cylinder.jpg), shows the facets present in the cylinder, which was originally a nurbs part before being exported from CAD.

I've included my Octane Preference settings as well (Preferences.jpg) and also the obj/mtl file itself, in the hope that it may be of some use in checking where the problem lies.


Thanks for looking.
Martin.

[glimpse]

=) long storry short: export as dense subdivs as You can (as ocane don't deal with nurbs) and use smooth (or smt like that, in material options) keep in mind to check that Your gemetry file would be in right units.

[PhilBo]

Sorry to contradict glimpse, but there is another solution. Your file is technically fine. The scale that you exported was WAY too large. I imported into Blender, scaled down and re-exported. I then opened in Octane and using the material selector picked the cylinder. I then checked the "Smooth" button and as you can see, no bands.

[roeland]

I don't have a problem with the obj file either. Are you using any normal or bump mapping? What is the output of the deep_channel_kernel in "Shading normals" and "Geometric normals"?

--
Roeland

[glimpse]

Sorry to contradict glimpse, but there is another solution.

CylinderTest.png

no problem at all! =) we are all here to learn. By writing 'right units' I had in mind scale =) though I probably was too sleepy to put right words =)

anyway, I notised, that even the right scale doesn't always help, You can still see that the geotry is not as smooth as it has to be, so having geometry that is more dense is helpful. but that's just my observation - i might doing something wrong =)

[blowlamp]

Thanks for the replies, chaps and I hope none of you spent too long looking into this, as I fear the 'error' is of my making

After importing the file to Octane, I dragged the Clear Glass material onto the cylinder (4th down in the material list), but didn't notice/read the Tooltip which quite plainly states that smooth is not enabled (Oh, how we all laughed ). Needless to say, switching that option to on cured the problem.

Hi, PhilBo.
With regard to scale, the cylinder was made as being 120mm in diameter and 70mm in height and so it was exported from my CAD program in mm's - I have set my copy of Octane to also import in mm's as these are the units necessary for the kind of work that I do. Does Octane see the cylinder object as being in mm's or metres - I did find this confusing at first, but thought I had it figured out?

Thanks again for helping out this newbie to Octane rendering.


Martin.