The clear z-buffer attribute indicates whether the Z-buffer is cleared during renderer initialization. If you set clear Z to True, then the Z-buffer is cleared to the value specified in the renderer's clear Z value; otherwise, the Z-buffer is not cleared. Only pixels within the renderer's clip list are cleared. If you set clear Z to True, and if the drawable associated with the renderer has the capability to support a Z-buffer, then a Z-buffer is allocated, if necessary.
The complete list of renderer attributes is listed in the Renderer Attributes Table.
For an overview about Renderers, see General Information. For a list of all Renderer functions and related topics, see Rendering.