Validation of CG Models - An Introduction to Computer Graphics for Artists - page 137

Fig. 9.27 The green face in this image penetrates another part of the same object

Fig. 9.28 The carton on the right is made of many different objects positioned to appear as if they
are all one object. On the left , these parts have been transformed away from each other to show they
are not connected

You should not have any spikes in your object. If you have even one, your model
should be fi xed before delivery.

9.4.11 UVs Outside Legal Space

Texture coordinates are defi ned with an X-axis and a Y-axis value. Any coordinates
below zero or greater than one cause tiling. Tiling is when an image repeats, like