From: Anders Gabrielsson (
Date: Tue Aug 25 2015 - 09:08:04 CDT

Regarding the interactive ray tracer in VMD 1.9.2. (Linux64 binary release)

I've got two cards installed in my machine, but it seems I can only use a
single device as optix accelerator for the interactive rendering mode. (the
one connected to a display -- ie the OpenGL renderer).
VMD reports two accelerators present at launch, but setting
"VMDOPTIXDEVICEMASK" does not to influence what device is used for the
interactive rendering. (I don't know how to check what devices are used for
batch rendering.)
The interface can become very unresponsive for complicated scenes, so
offloading some work to the other card would be useful.

Is it actually possible to use both devices for interactive rendering -- or
only the headless device?
Are there any hacks to increase responsiveness during rendering when using
the display device? (at the cost of reduced rendering speed, I suppose..)