Live feed with decay
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Howdy!
I am trying to recreate a live version of the picture below. I made that picture by blending a few layers using a darken blend. For the live version, I want live feed with the stage being a tv.
The idea is a dancer is in front of the camera standing still and then their small movements create the same effect which accumulates. Though at a certain point I'd want older layers to dissolve away completely. I know there are blend modes in the effect mixer actor but I don't know how to go about setting the rest up. Any help would be greatly appreciated!!
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try feeding the video into an Effects Mixer on channel 1 and running the output through a Video Delay into channel 2. By adding a Video Mixer into the loop you can control how much of the output feeds back into the input. Play with different blend modes until you get the effect that you like.
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@as1ama1and looping the video through a set of 3 shader actors does quite a good job.
Freeze shader: grabs a frame at the start of each cycle and holds it. It does this through a feedback loop (output → pass-through shader → back into video in 2), because Isadora's GLSL actor has no persistent buffer.
Pass shader: an empty shader that just closes the loop.
Mix shader: lays the frozen frame over the live image and fades it out over time. blend mode decides whether the clone shows only where it's darker or lighter than the live image, so the live video is never covered.
A Wave Generator (sawtooth, 0–100) drives the clock input. One cycle equals one snapshot, so freq sets the cycle time.Here's the patch: echo trails
Best Michel
