Taking screenshots

[lionfish]

Hello,
I'm trying to count the number of pixels of a certain colour in each frame of a scene (don't ask why!!!). It doesn't need to be quick as I'm running through the telemetry afterwards.

My plan is to do something like:

capture_tex = viz.addBlankTexture([1,1])
viz.window.screenCapture(capture_tex)
data = capture_tex.getImageData()

Then process the 'data' array.

My problem is the screenCapture function
(from here: http://docs.worldviz.com/vizard/comm...eenCapture.htm )

The top of the page says it takes a string (file to save screenshot to), but the example further down it has a texture object passed to it instead. Is this really possible? When I tried I get an error:

File "C:\Program Files (x86)\WorldViz\Vizard30\python\viz.py", line 8160, in screenCapture
_ipcSend(_VIZ_SCREENCAPTURE,0,0,fileName,0.0,0.0,0 .0,0.0)
TypeError: message must be a string

as if it really needs a string, and passing the texture object isn't correct.

Any ideas?

Thanks!

Mike.