Degenerative faces

[Falam]

I've been searching for a script that can highlight degenerative faces on a mesh, similar to this blender script. If they can be fixed as well, all the better, although highlighting will suffice

[gaboraa]

I would recommend using mCleaner. It's very cool and powerful for finding topology errors.
http://www.si-community.com/community/v ... f=4&t=2209

[Falam]

I've been using mCleaner for a long time, although it doesn't have this option

[myara]

I'm slowly working on a new version of mCleaner in my free time, so if it isn't too difficult to write I could include this feature, but the thing is I'm not sure what it is. I have never seen a degenerative face in Softimage. I think I had in Maya but never in SI. If you can upload somewhere the scene file I could give it a look.

[Daniel Brassard]

Have you tried the merge vertices with a low threshold?

[myara]

I just watched the video in my PC, and now i understand what degenerate faces are

I found this snippet in Stephen's Blog:
http://xsisupport.com/2013/03/13/findin ... s-by-area/

But the script may not work if your object isn't named cube, so you may try this:

Code: Select all

#Python
si = Application
epsilon = 0.00001
 
# Get PolygonArea DataArray (which is a tuple)
attr = si.Selection(0).ActivePrimitive.GetICEAttributeFromName( "PolygonArea" )
areaData = attr.DataArray

#
# Find the indices of the bad polys
#
bad = [ x for x,y in enumerate( areaData ) if y < epsilon]

# Select the degenerates with a string like 'cube.poly[112,114,155]'
if len(bad)>0 :
   si.SelectGeometryComponents( (si.Selection(0).fullname) + '.poly[%s]' % ','.join(str(i) for i in bad) )
 

Is the same code but I changed the string "cube" with your current selected object and added a condition to avoid an error if your object doesn't have degenerate faces.

It will select the degenerate polygons in your selected object.

[gaboraa]

Last night I tried to produce degenerative faces in Maya because I wasn't able to produce in SI and I was familiar with degenerative polygons when I used Cinema 4D and I tired your script and Stephen's on my mesh and both couldn't delete the degenerative face but filtering points did the job. I attached the obj so that you can check if I was doing something wrong. BTW I love all your plugins, huge time savers!

[myara]

Thanks gaboraa.

Stephen's script only selects the degenerate polygons, it doesn't fix anything.
My version is just Stephen's modified to work with your current selection instead of a cube.

The faster way to fix them would be to select the object and Filter Points. But in some cases you may be having overlapping points deliberately in your modeling so it would be better to first detect the degenerate polygons and then decide where do you want to run Filter Points.

That's where this script is useful. Run the script, change your selection to points(Select Adjacent), change your selection manually as you want, and then run Filter Points.

You could also delete the selected polygons but that would create separated edges.

By reading the definition in the net, to create a degenerate polygon you just need to move the points until you are overlapping them with others and the polygon area disappears.
Ex, create a cube and move the points until you get a pyramid.

By the way, you could have a Quad/Ngon where just a triangle part is completely hidden but this wouldn't qualify as a degenerate polygon in this script because the Quad/Ngon still has area. You'll have to have a very messy modeling workflow to do this though, but if you do, triangulate it before checking.