From: Tristan Croll (
Date: Fri Jun 27 2014 - 18:54:57 CDT

The deadly combination of laziness and curiosity strikes again!

One further question: is there a good listing of all the available switches for Tachyon available. It's the best renderer I think I've ever come across, but online documentation seems relatively sparse.



Tristan Croll
Faculty of Science and Technology
Institute of Health and Biomedical Engineering
Queensland University of Technology
60 Musk Ave
Kelvin Grove QLD 4059 Australia
+61 7 3138 6443

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On 28 Jun 2014, at 1:44 am, "Josh Vermaas" <<>> wrote:

Hi Tristan,

I think the string in the file render controls dialog gets passed directly to the shell to be executed (at the very least, the text in that dialog box never gets passed through a Tcl interpreter that I can see), so it dutifully tried to execute tachyon (with passed parameter -res [expr 879. I'm not sure why it didn't die when the first argument wasn't an integer) on the list of files * 5] [expr 886 * 5]. The wildcards * are what got you into trouble, since it will try to render everything in the current directory (twice no less, since it appears in the argument list twice).

What I tend to do is save the tachyon file and then run the renderer externally if I want a crazy-big image. (render command = "echo hello", then open a new terminal and run tachyon with all the options I want on the created data file)

Good luck!
-Josh Vermaas

On 6/27/14, 12:12 AM, Tristan Croll wrote:
So this is more of a humorous event than a bug that is going to really hurt anybody. In order to render a bigger-than-screen-size image using the File Render Controls dialog, I added:
-res [expr 879 * 5] [expr 886 * 5]
.. to the Tachyon input line, where 879 and 886 are the window dimensions from running
display get size

Evidently this doesn’t work, since now Tachyon is busy attempting to render all 481 files in the current directory (a couple of dozen of which are actual Tachyon files), and I can’t kill it without killing my VMD instance. It’s nearly done, thankfully...

Anyway, after all that, I think a really nice feature to add to this dialog would be a “screen size multiplier” box or drop-down menu, to make it easier to render very large images without the need to know the specific syntax for each renderer.