Some glossary entries seem unnecessary or contain explanations which should perhaps be elsewhere; e.g. tool descriptions.

Tool descriptions I've found in the glossary so far:

Subdivision Surface

Knife

Proportional Editing

Extrude

Others seem perhaps overly specific (I could not find any reference to any of these with a quick search):

Gouraud Shading

Phong

Doppler Effect

Are there any other glossary entries which perhaps should be in the glossary?
Do we have a solid definition of what should be a glossary term and what shouldn't?