Revolved polygon only showing back faces?????

# 1 10-09-2012 , 12:08 PM

Registered User
Join Date: Sep 2012

Posts: 6

Revolved polygon only showing back faces?????

Hi All!

There will be a time where I don't ask questions about every small thing, but as you can see below, I extruded a few faces and when you move orbit around the object it changes place, so even though I extruded it with faces on the front and sides you can't see them.

https://i966.photobucket.com/albums/a...910/bulb-1.jpg

https://i966.photobucket.com/albums/a...910/bulb-2.jpg

What's happening?!?!? lol

Thanks

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# 2 10-09-2012 , 12:44 PM

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Join Date: Apr 2012

Posts: 187

The first thing I would do is check the normals which off the top of my head is under display -> polygons -> face normals, and if you have backface culling on (display -> polygons -> backface culling) and it is also under the view or show options I believe ...?

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# 3 10-09-2012 , 03:50 PM

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Join Date: Jan 2004

Location: Michigan, USA

Posts: 2,998

It appears you have the object normals inverted AND you have backface culling on so you are only seeing the inside faces.

To check the normals go to the lighting drop down and uncheck two-sided lighting. Anything with reversed normals will be black. However, with backface culling on you will not see anything change.

To check backface culling select the object go to the shading drop down and make sure backface culling is unchecked.

IMPORTANT - The problem here is in a moment of total RETARDATION the makers of maya allow like 15 different and independent ways to turn on backface culling.

So, if you have the item selected and backface culling is not checked in the shading drop down then in the command window type: ToggleBackfaceGeometry;

You must be very careful in maya hitting random keys as many hotkeys can do things like turn on backface culling and this can drive you literally insane because it's nearly impossible to figure out what feature you accidentally turned on to be able to undo it.

"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675

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# 4 18-09-2012 , 10:09 AM

Registered User
Join Date: Sep 2012

Posts: 6

The first thing I would do is check the normals which off the top of my head is under display -> polygons -> face normals, and if you have backface culling on (display -> polygons -> backface culling) and it is also under the view or show options I believe ...?

Originally Posted by dustykhan

cheers dustykhan ill have a look later and get back to you!

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# 5 18-09-2012 , 10:10 AM

Registered User
Join Date: Sep 2012

Posts: 6

It appears you have the object normals inverted AND you have backface culling on so you are only seeing the inside faces.

To check the normals go to the lighting drop down and uncheck two-sided lighting. Anything with reversed normals will be black. However, with backface culling on you will not see anything change.

To check backface culling select the object go to the shading drop down and make sure backface culling is unchecked.

IMPORTANT - The problem here is in a moment of total RETARDATION the makers of maya allow like 15 different and independent ways to turn on backface culling.

So, if you have the item selected and backface culling is not checked in the shading drop down then in the command window type: ToggleBackfaceGeometry;

You must be very careful in maya hitting random keys as many hotkeys can do things like turn on backface culling and this can drive you literally insane because it's nearly impossible to figure out what feature you accidentally turned on to be able to undo it.

Originally Posted by ctbram