Scan CHOP examples with blanking?

General TouchDesigner Discussion
1

Attempting to use the blanking functionality on the Scan CHOP to clean up laser output before sending to ether dream. In this example, I would like to:

  • Set position to start of the first line
  • Turn RGB on
  • Scan the first line, using limit step size
  • Turn RGB off
  • Reposition to start of second line
  • Scan the second line, using limit step size
  • Turn RGB off

The documentation on the Scan CHOP is not complete and there don’t appear to be any examples of scanning a SOP with blanking. Can anyone help explain? The blanking setting appears to be applying some kind of PWM to the RGB channels instead of what I was expecting.

derivative.ca/wiki088/index. … =Scan_CHOP

Cheers,
Tim.
Blanking_Test.toe (4.51 KB)

2

Hi.
Im looking at the output in the scan1 CHOP from your example, and it does appear to be doing that.
You can crank up the blank count to something like 50 to see what its doing in the graph more clearly.

The blanking option just repeats RGB=black a number of times at the start/end of each line segment.

Often its easier to reduce the output rate to something quite low like 20hz to verify the output is correct, before increasing it again.
Laser projectors can be quite difficult to get clean output, as the physical lag of the galvos can be quite limiting.

Cheers
Rob.