ray3.exe outputs to STDERR, so you cannot simply do this:
ray3 -v 6 test.mi > out.txt
You have to do something like this:
ray3 -v 6 test.mi 2>out.txt
In the above command, 2>out.txt redirects STDERR to the file out.txt.
Or you can do this, which redirects all output (STDOUT and STDERR) to out.txt:
ray3 -v 6 test.mi >out.txt 2>&1
Someone on the community forums was asking for a way to show the y coordinate of each point on a grid.
I gave it a quick try with ICE:
This ICE tree gets the point position, converts it to global coordinates, and stores it in an attribute. Then I just use Show Values (or an Attribute Display property) to show the coordinate value in the viewport:
Works ok but not great. The update is not interactive, you have to refresh the simulation to get the latest values displayed.