Hi Michael,

your were to fast with your reply ;)

If there is no workaround, i can live with that.
I would like to tell maxon about this problem, but i`m not sure if i can explain this issue well enough to them to make them understand.
Well, i will try it and direct them to this thread here.

Thanks for your effort Michael

Dirk

Hi Dirk, I took a look at your OBJ file, and it does look to be the problem that I was describing - the triangulation that C4D created is not so good and is following the example I showed above where it pulled out large triangles during the initial stages of the triangulation process and left a degenerate one along the side there.

Actually on the one side where it is showing black, I think that triangle actually got created in the wrong orientation, facing backwards - that's why it is black.


One workaround is to export from MoI as quads & triangles - that will end up using MoI's triangulator which won't do that.

I think it is also possible to manually edit the triangulation of an n-gon in C4D if you want to change how the n-gon is being diced up, there is something in C4D under Tools / N-gon Triangulation, I'm not quite sure how it works though.

One other thing to mention - it is pretty hard to see the triangle problem in an actual rendering, it is much more pronounced when you're zoomed in and looking with the real-time view.


I may be able to try and reduce the creation of this kind of shape in the future, but it is actually a proper n-gon, I mean it is not technically messed up or anything like that. It would be good if C4D would create a better triangulation for it.

It may be pretty difficult to describe this to Maxon, but I hope that the step-by-step triangulation illustration that I showed above may help...


Also, one other note - there is a setting you can tweak in the moi.ini file to change how MoI will produce a triangulation for things like that, by default it will do a kind of radial triangulation when possible, adding an extra point in the center of n-gons like that. It is possible to turn off that style and instead only use points along the outside of the n-gons, let me know if you want more info on that.

- Michael

Hi Dirk, just one other comment if you want to submit this to Maxon as a bug report, I would suggest deleting all the other polygons except for just one single one that has the black thing on it (but before yanking the points around), and then sending a file in with just that one n-gon in it as an example of the triangulation problem.

It helps a lot with bug reports to have the most simple data set possible that shows the problem.

It may not be a very easy thing to fix though, it can take a pretty big re-working of the triangulation mechanism to make one that does not back itself into a corner like this.

- Michael

If you're having problems getting OBJs into C4D, I recommend you try the RipTide plugin:
http://skinprops.com/riptide.php
http://skinprops.com/fr_rtdocs.htm

C4D is known to have quirks and limitations to its OBJ importer hence the reason why RipTide was created...

-Will

Thanks Will,

i`ve just tried Riptide, but unfortunately it doesn`t work in this case.
By the way, is it possible to direct someone directly to this thread?
The url in my browser just says: http://moi3d.com/forum/index.php?webtag=MOI


Greetings Dirk

vinced, middle mouse button new tab.

http://moi3d.com/forum/messages.php?webtag=MOI&msg=1620.1

~Danny~

Usually all the way at the bottom of the page there's an "All" link or "1-nn" link, those will also take you to the first post of the thread you're in. ;-)

-Will

Hi Dirk, also if you look in the upper-right corner of a message there is a link up there, like this one should say something like "1620.21 In reply to 1620.18"

Those little links are "permalinks" to an individual message, you can right-click on it and copy that address to the clipboard to give to someone else. If you want to give a link to the whole thread, go to the first message and grab it's permalink.

- Michael

"i`ve just tried Riptide, but unfortunately it doesn`t work in this case."

Sorry to hear it didn't work out for ya - Keith is presently tuning up his plugin and he's taking input from this thread here:

http://forums.cgsociety.org/showthread.php?f=47&t=624337

You may want to pop in and mention the problems you had or if you have some suggestions etc.

-Will