Don't erase background for visual trace in Quartz Composer
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19-01-2021 - |
Pergunta
I it possible NOT to clear the background in Quartz Composer? I want to move an image across the screen and keep it visible at the old positions to have some sort of trace effect.
Thanks and regards,
Sebastian Mecklenburg
Solução
Do your rendering inside a Render In Image
patch, and connect its output to an Addition
patch. Connect the output of Addition
to an Accumulator
patch, and connect the output of the Accumulator
patch to the "Background Image" port of the Addition
patch, to create a feedback loop. Then connect the Addition
patch to a Billboard
.
Outras dicas
Check 'Enable Feedback Rendering' under the properties for the Render In Image
patch.
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