How to ZDepth

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What is a ZDepth?

When an object is rendered, the depth of a generated pixel from the camera is given a depth value. These are normally clipped to an value set by the artist (example: The closest object is 1′ and the farthest object is 30′). Pixel behind an object are referred to as being z-culling.

What is it used for?
A ZDepth element when brought into a composting (Nuke, Photoshop, AE) program allows a few post effects to be applied which are normally expensive and time consuming when done in a 3d software. Some of these effects are:

  • Adding in fog
  • Adding in depth of field
  • Clipping/Masking objects in 2d

 

The RBG Render

 

The Z Depth

 

Adding post fog effects

 

Adding post depth of field effects

 

Adding a clipping by distance effects

Common problems and solutions:

While this may not seem right, you do NOT want to apply filtering (Anti Aliasing)

 

Lets see what both filtering anti aliasing are on and off

Correct with filtering anti aliasing off.

 

Wrong with filtering anti aliasing on. See those edges and the odd render effects in the blur?