Validation of CG Models - An Introduction to Computer Graphics for Artists - page 135

Fig. 9.25 The white stripes in this image are caused by a misaligned texture

unwanted polys fl oating around. Another way to check is to select every face in a
very large area. If you see any suspicious highlighted points where they don't
belong, you may have one or more fl oating faces.

9.4.5 Leftover Geometry

There are many reasons to create excess geometry. When building a number if
duplicated windows, if the number to be made is estimated rather than known, the
artist might make several dozen and then have a few left over. The same can happen
for any kind of object that is repeated, like wheels, doors, bookcases, etc. Artists
will also do this for shapes they intend to use more than once, like modifi ed cylin-
ders or cubes. There is nothing wrong with working this way as long as the excess
geometry is removed when fi nished.

9.4.6 Misaligned Texture

If your texture coordinates are not properly projected and edited but they are undis-
torted, you may get a misaligned texture (Fig. 9.25 ). Depending on the reason this
error appears on your model, it can be a more or less serious error. If the mistake is
due to whitespace in your texture border, it is easy to fi x in an image-editing pro-
gram by cropping the texture map. If it is due to incorrect texture coordinates, they
must be reprojected or edited.

9.4.7 Origin Offset

During the modeling process, you may move your model away from the global
origin (Fig. 9.26 ). If you do, you should move the object back to the global origin
when you are done. If you do not, it is considered sloppy work. An accepted