The Z Depth node converts the Z-depth in camera space to a greyscale texture (figure 1).
Figure 1: The Z-DepthA measure of object distances from the camera typically represented as a grayscale image. node connected to the DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters. pin on a Diffuse materialUsed for dull, non-reflecting materials or mesh emitters. and the material is applied to all the objects in the scene
Normalize Results - Takes the result and normalizes the values between 0 and 1.
Normalization Range - Determines the minimum and maximum values for the normalized range.