This page gives information on the Distributed Rendering ID Render Element.
The Distributed rendering ID Render Element shows the name of the rendering machine that rendered any particular bucket when distributed rendering is used. It renders an image with each bucket shown in a different color, and a short text on each bucket naming the machine that rendered it. A bucket is a region of an image that is being rendered. The render setup must be set to use the Bucket image sampler, which divide the rendering process into render buckets. This render element is useful for assessing machine performance or for troubleshooting a distributed rendering process.
This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:
VRayVFB – When enabled, the render element appears in the V-Ray Virtual Frame Buffer.
Deep output – Specifies whether to include this render element in deep images.
Text alignment – Sets the alignment of the machine name that displays on each bucket.