Feedback issue when following tutorial

Beginners
1

Hello. I am following this tutorial step by step but does not get the suspected effect when it comes to patching the signal into feedback (approximately 10 minutes into the video https://www.youtube.com/watch?v=SLDL8pQ5c0M&t=641s ).

I went back and checked the video for times and checked my settings but could not realy find out what settings i could have missed, if any. So im wondering if someone else would like to help me debuging my patch?

Here is a link to my project.

Norrsken.1.toe (6.0 KB)

2

Hi @Bas_DJ,

you are not seeing the feedback effect as the alpha channel of the texture going into the loop is 1. With this the Over operation of the Composite TOP will cause one frame to fully block the other and prevent the desired look.

You have a few options:

  • do as in the video and move the RGB Key TOP to after the feedback loop
  • remove the RGB Key TOP entirely (unless it is somehow needed towards the end?)

The checkered background for TOPs indicates the amount of alpha in your texture. If you output this to a projector or a second screen using a Window COMP, the background will not have this pattern.
You can also switch the default for TOPs in the Preferences Dialog under the TOP tab to “Black”.

For a quick introduction to some of the fundamental ideas behind TouchDesigner, we recommend having a look at our curriculum at learn.derivative.ca

There is also a section on feedback:

cheers
Markus