artifacts (pinched triangles)

[tortilla1]

After crunching I seem to get a lot of artifacts (pinched triangles, look like small black triangular shadows).
I recently installed the latest vesrion of polycruncher, and I have a feeling I get more then before.

How can I get rid of them/ reduce them ?


cheers

[mootools]

Hello,

I don't know what was your previous version but the algorithm does not change since 7.x
The enhancement consists in new feature provided with Polygon Cruncher such Confused point or Merge coplanar face tools.

Under some circumstance, planar optimization might inverts the face normal.
You may try to use the Merge coplanar face tool or to check Prevent normal inversion.

The next algorithm improvement will consist to remove such artifact.

I hope this help,
Manuel

[PolyMonkey]

I ran into a similar problem with polygon normal inversion. After some trail and error tests I found the when you import the optimized mesh (obj in this case) into 3DS Max, if you deselect "unify" it will prevent the normals from being flipped. When unify is selected and I import the origional mesh it works fine. It's only after I've used polygon cruncher and import an optimized mesh do I have the issue.

[tester7]

Hi,

I'm getting this kind of problem (with the current trial)
(But if I draw normal 3DMAX cube and optimize it, that works..)

Original


After 1% optimized (or even 0%)

[mootools]

Hello,

I have to check that specific problem has it appears to be a border side effect of the new release.

Please verify that the Prevent normal inversion in the advanced tab is checked.
The last version now memorizes this setting (this was not the case for the previous one).
This means that - switching from 7.5 to 7.6 - could have made this setting being unchecked.

I hope this help,
Manuel

[DougC]

I just downloaded the demo and I'm getting a similar result to the first post. I've double checked all the settings mentioned above, converted it both ways and still get the same results. You could manually go in and fix these problems but as you can see on the left there are quite a few.

This model is coming from zbrush, are there any special setting you need to set in zbrush for export, or setting on import to max? I’m working on max 2009 btw.

[metalliandy]

Hey all,

I am also have major problems with the artefacts shown by DougC.

Everything looks fine in the Polygon Cruncher view port but when i load the exported .obj i get the pinching as shown above.

I have the Prevent normal inversion checked.

Any ideas?

[dirty deeds]

This is a problem for me as well! In fact, I've never optimized a mesh w/PC without seeing these artifacts! I'm working with approx. the same workflow as well: ZB3 -> PC (via 3d photo browser) -> Max 2009 x64.

[Same problem...]

I'm having the same problem--prevent normal inversion is checked.

Ian

[Poly Optimus]

I have Polygon Cruncher 7.8 installed.
After importing an OBJ object into 3dsmax 2009, and polycrunching it.
The result show random various bad shaded polys. See image.
Please help!

[mootools]

Hello,

The pinched triangles might occurs on rare circumstances, particularly when there are planar surfaces.
A workaround can be to use the Merge Coplanar faces as a preprocess step in the Tools menu.

Anyway, I will work on that particular point for the next version of the algorithm.

Thanks,
Manuel

[dirty deeds]

I see this in every single mesh I attempt to optimize. It is not rare in my case.

[metalliandy]

Please could you post a small mesh where the problem appears?
I am nearly releasing the new version of Polygon Cruncher and that will help a lot.

Thanks,
Manuel

I have sent you a PM with the link my example is included.
Hope that helps

[mootools]

Many Thanks for your help.
Sure that it will help me to find out a solution and improve the algorithm.

Manuel