From: Dallas Warren (
Date: Thu Dec 05 2019 - 19:02:31 CST

Which version of vmd? What graphics card are you running? What drivers?

Nvidia RTX and the vmd RTX version? If so, there is currently a memory
leak, which means it will fail eventually. For the moment, use the non-RTW

Catch ya,

Dr. Dallas Warren
Drug Delivery, Disposition and Dynamics
Monash Institute of Pharmaceutical Sciences, Monash University
381 Royal Parade, Parkville VIC 3052
When the only tool you own is a hammer, every problem begins to resemble a

On Fri, 6 Dec 2019 at 05:22, Bart Bruininks <> wrote:

> Heya,
> I have been rendering some movies as of late, and I keep running in to the
> following error after about 150 frames:
> ERROR) OptiXRenderer) ERROR: Unknown error (Details: Function "RTresult
> _rtContextLaunch2D(RTcontext, unsigned int, RTsize, RTsize)" caught
> exception: Assertion failed: "!m_enteredFromAPI : Memory manager already
> entered from API", file: <internal>, line: 1099) (OptiXRenderer.C:2597
> I am running vmd 1.9.4a31.
> It results in the rendering to continue in the moviemaker, but no actual
> files are written (an empty file does get created).
> Cheers,
> Bart