Wire Training Course 1.12 - Feedback & Delay

[@gchenpz]

Thanks for the great tutorial. I have a question in creating the "trailed effect" using the feedback loop. When the opacity is set to around 90%, the feedback loop does create a nice trailing effect, however, it also leaves some sort of "color/luminance residues" on the screen, adversely staining the whole video, like that at 3:25 of this tutorial. Is there any way to get rid of this "color/luminance residue" as the video/effect progresses? OR is it possible to add some code to clear the opacity completely when the layered opacity gets down to a certain threshold? Looking forward to your answers. Thanks heaps!

[@ResolumeVJSoftware]

You are right, that is a side-effect of doing feedback like this. It is simply a very "dirty" proces. But there are solutions! The most GPU-intensive solution would be to use a Ringbuffer node instead of a feedback loop. This will delay the signal in a similar way. Next, you want to put a Fader node on the instanced textures from the Ring Buffer and hook up a Linear node to the gain inlet. A lot cheaper solution would be to take the output of your feedback loop and send it into a Greater node set to a really low value (0.03 did the trick here). This returns only pixels that are above 0.03. Use a single float for the float4 inlet. Next, you use the ouput of the greater node as a Mask for the feedback loop. This is essentially a filter for your pixels. You check which pixels are have a super low opacity and filter them out with the mask node. Trails without residue! Another solution I found was putting a Fader node in the feedback loop.. set to something high like 0.90. This way you use the feedbackloop to fix the feedbackloop.. feedback-ception! But this might not work with more complex loops.

[@SuperMichel2000]

Thanks

[@eyesoar77]

Great tutorial series. I have been following along but I don't see the "End Reached" trigger in the Timeline node. Has it been moved in Wire 7.7 or am I missing something?

[@ResolumeVJSoftware]

glad you found it!

[@RsDeffKcp]

can I get a copy of the code for this ?

[@eyesoar77]

Ok I asked this too soon - Right Click then Visibility - then End Reached. I feel kind of foolish but this may help others that skip ahead.