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I'm new to Blender and I was wondering how to correct this; i'm not sure what to call it on my faces...

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i'd be grateful if you legends could enlighten me?

Pete Holland
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    It is called duplicated geometry, and that causes what is called z-fighting (do a search for that on this site) in edit mode do remove doubles –  Oct 14 '17 at 00:34
  • nice, remove doubles worked nicely, thanks – Pete Holland Oct 14 '17 at 15:42

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To get straight to the point if you try to extrude an object that is completely selected, it creates a duplicate of the object. Basically the weird "glitch" you are seeing is blender's lighting is having trouble processing your model because there's two of them in almost the exact same place.

Note: Extruding an entire object isn't a bad thing in blender, it can be used add another layer to the model, if you scale what you just extruded.

I tried my best to recreate the problem you were having in the following pictures:

  1. The first image is an extruded but fully selected model

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  1. The second is after I extruded the model

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  1. This picture is of the same extruded model from picture two except I scaled the object on the X and Z axis (You can scale objects on specific axis by pressing your S key to scale and then X, Y, or Z for it so scale on one of those specific axis.)

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  1. In picture four I'm trying to show a huge use for extruding an object. If you were to bring an object with only one set of faces ("only one layer thick") it would only show one side and the other would be invisible.

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Hope this helps sorry for the barrage of information, but I remember being new and I just don't want you to hit my same pot holes.

m.ardito
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nova nanite
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  • sweet, thanks for the help, good to know blender does that; accidentaly extruding outwards if the model is selected. remove doubles worked nicely. – Pete Holland Oct 14 '17 at 15:43