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Newbie question about square waves

Just getting started with PsychoPy, and forgive the newbie question, but I’d like to make a sqr grating in Builder that is red and black, or green and black. Tried playing with grating parameters, but nothing obvious to me helped. Any solutions?

Does this help?!topic/psychopy-users/WQfw2PKUHg4

Yes, thanks! Not obvious is that you cant do textures in pix units.