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Uneven grating stimulus using builder or coder

Dear All!

I am trying to build an experiment where I have grating going from one end of the screen to the other. However I would like the spatial frequency to be so that when looking at a central spot the width of the bars will always have the same visual angle, aka-getting closer towards the edges of the screen. Is it possible to create a grating stimulus, via builder or coder that doesnt have even spatial frequency throughout the screen or should I use bar polygons?

Best regards,

Gergely