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So I've never done it but now that I see other models with it everywhere I wonder why? I included pictures because I'm bad at describing things. (This is also why I ask here, I don't know what terms I'd search for)

-Is it needed or recommended to use edged faces? If so, please explain what you'd use them for in modeling or animating.

Plain Face enter image description here

Edged Face enter image description here

Thank you.

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Quads are not always necessary, but are usually preferred when deforming a mesh for animation &/OR Rigging. If you are creating a static model (eg. a sculpture of a statue, etc...) Then it can be acceptable to use Triangulated faces, as there is no reason to worry about the integrity of the deformations.

Notice the deformation smoothness when we bend a cylinder. enter image description here

enter image description here

As for my version of face Definitions:

NGon technically a face with vertices > 3, but because we have names for 3 vert, and 4 vert faces, this is commonly reserved to describe a face >= 5.

Quad = 4 vertices.

Triangulated is just the primitive minimum for a face to exist, as the vertices that make it up = 3.

Two vertices make an edge with no area.

One is just a single point (Vertex).

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  • $\begingroup$ Alright, so plain aka Quad faces for animated models and edged aka Triangulated faces for non-animated models. Thanks Rick Riggs! Edit: Also, thanks for the picture examples! $\endgroup$ – Scrotty Mar 5 '16 at 1:19

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