[mcstas-users] need help on installing VRML for Trace view

Tong, Xin Tony tongx at ornl.gov
Wed Jun 26 20:10:29 CEST 2013


Yes I'm using windows. I'm using only 100 neutrons for the tracing. The McStas version I'm using is 2.0. I installed McStas couple of weeks ago and then I installed Octaga today.
Matlab seems to be fine for displaying the 3D trace, but not for Octaga....


From: Peter Kjær Willendrup [mailto:pkwi at fysik.dtu.dk]
Sent: Wednesday, June 26, 2013 2:06 PM
To: Tong, Xin Tony
Cc: mcstas-users at mcstas.org
Subject: Re: [mcstas-users] need help on installing VRML for Trace view

Hi Tony,

On Jun 26, 2013, at 15:56 , "Tong, Xin Tony" <tongx at ornl.gov<mailto:tongx at ornl.gov>> wrote:

I'm very new to McStas and would appreciate some help on installing VRML. I've installed McStas and I can use Matlab to see the Trace view.
However I found it not as clearer as VRML. Then I tried to select HTML/VRML option. Every time I run, the command window says the following:

Spawning start to view mcdisplay_commands.wrl
The process cannot access the file because it is being used by another process.
Press any key to continue . . .

This indicates to me that you are using windows, is this true? As far as I know, this is the only system where read-access to files can be blocked by other processes.  How many neutron rays are you trying to send to the file? Our experience is that more than 1e3 can cause various problems, what you are seeing could be a side-effect of running with many neutrons.

 I've installed Octaga Player, but I don't know how to link it to McStas.

If you are indeed using windows, that link should be set up automatically, i.e. the OS takes care of registering wrl files to Ocataga.

Can someone provide some help on this?

You will have to provide more info on the system, i.e which version of which OS, version of McStas etc.

Still: a workaround is to open the mcdisplay_commands.wrl from within Octaga.



Peter Kjær Willendrup

Senior Research Engineer, Special Advisor

DTU Physics

Technical University of Denmark

[cid:image002.gif at 01CE7276.E63F0440][cid:image003.jpg at 01CE7276.E63F0440]

Department of Physics
Neutrons and X-rays for Materials Physics

Building 307

DK-2800 Kongens Lyngby

Direct +45 2125 4612

Mobil +45 2125 4612
Fax +45 4593 2399

pkwi at fysik.dtu.dk<mailto:pkwi at fysik.dtu.dk>

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