# USD (Houdini)

## Generate .usd files

RR used Houdinis Husk to render .usd files.
To generate .usd files, please see the Houdini help section.

## Errors

### Freezed

Mantra requires to run the hserver.

If the hserver is not started before the rrClient starts to render, then mantra starts the hserver.
hserver continues to run after Mantra finished.
And as long as a child process (hserver) is running, the render script will not finish.

Workaround: Please start hserver with the system.
Please see https://www.sidefx.com/docs/houdini/ref/utils/sesinetd.html