What is the different between 'zfill' and 'zuse'?

  Hi, I am new in CS.
  In the user manual, there are a few explanation of 'zfill' and 'zuse'. I still don't understand much about what is the different between 'zfill' and 'zuse'! Can you give me some information about them?
  Thank you very much!

[jorrit]

zuse is what is considered normal. It means that when a triangle is rendered on screen the z-buffer will be checked (to avoid pixels of the triangle that are behind other triangles to be rendered) and also when the triangle pixel is rendered the z-buffer will be updated so that future triangles will not render unless they are in front of this one.


With zfill the z-buffer is only filled and not read. That means that a triangle that uses zfill will always overwrite all other triangles that are already at that spot.

Greetings,