[PD] Gem feedback effect

[Csaba Láng]

Dear List,
I am looking for a solution to keep the pixels I already have rendered in
Gem, but when I rotate or offset it, the frames before stay and the new
frame is added to the old frame.
Can you give me a hint? I tried to understand pix_buffer but a bit hard to
get it working with the write and read couple.

Best,

Popesz
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