How to change motion direction of a grating stim without changing its orientation?

Dear all,

I need to present a sliding grating in 3 different directions (upward, downward and intermediate motion direction) while keeping the exact same orientation. In other words, I need to set a motion that is not orthogonal to the lines orientation of my grating. Do you know how I could set this please?

Best regards,
Kim

Hi @KimB
can you share the solution if you found one?