thanks for the comments. i merged scratchpad-effects into master.
there are 3 effects implemented as shown in the video: jiggle, wave and ripple. i added a scratchpad-effects.scm to examples in which you can see the parameters.
feel free to add more effects to GLEditor::Render or rename the current parameters if they don't make sense.
the effects can be switched on and off with f9. best, gabor
