View Full Version : Extrusion query

03 March 2006, 07:04 PM
Hi guys. I have been doing a tutorial on the Newtek website that shows you how to model a hand using a background image.

When I choose polygons and Extrude them downwards on the Y axis the polygons now face inwards, which means I have to select them and Flip them to face outwards.

Am wondering why this happens, does anyone know?

03 March 2006, 07:32 AM
It depends on the direction your original polygon is facing when you extrude it.

03 March 2006, 10:16 AM
If you do a extrusion on a poly the direction of the normal indicates how the geometry is extruded, so if you have the normal facing inward all extruded poly's will face inward. Try it with a single poly and extrude it, undo it flip the poly and extrude again, you'll see the difference. :)

03 March 2006, 12:55 PM
If the polygon's normal is facing the direction of the extrusion, flip it before extruding :)

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03 March 2006, 12:55 PM
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