Understanding surface normal direction


show more Understanding surface normal direction provides you with in-depth training on 3D + Animation. Taught by Ryan Kittleson as part of the ZBrush 4 Essential Training show less
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Understanding surface normal direction

Occasionally, you may find that models that you import from other programs will appear to be inside out. This is because polygons have two sides: a front and a back. The direction that the front side faces is called the normal, which is a mathematical term. It doesn't mean what the word 'normal' normally means in this context. Sometimes ZBrush will get confused about which side is which. Since the back side of a polygon is invisible by default, the model can seem to be inside out. This problem is easily corrected.

Let's open up the DemoSoldier and expand the Display Properties sub-palette. Right now, there's no problem with the normals. But if we click the Flip button, the active subtool looks like it's backwards. You see now we're seeing the inside of the model. This is because ZBrush has just flipped which side of the polygons are front and which are back. Clicking Flip again will set the Normals in the correct direction.

Let's hit Flip once again in order...

Understanding surface normal direction
Video duration: 2m 11s 2h 58m Beginner Updated May 07, 2015

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Understanding surface normal direction provides you with in-depth training on 3D + Animation. Taught by Ryan Kittleson as part of the ZBrush 4 Essential Training

Subject:
3D + Animation
Software:
ZBrush
Author:
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