Fade

Beginners
1

I’d like to make a phony fade/motion blur. By not clearing the color buffer, I could render a .01 alpha black quad over the screen to dim the previous result.

Now, I’m unclear how this would work in TouchDesigner. I can take the output render of my object as input into a GLSL top - and do an alpha subtraction. However I’m not sure how to set the output of the GLSL top as a background into the render of my object (other than adding a full screen quad to my object list). In addition, I’m not positive how to achieve the buildup of successive renders…the color buffer is always cleared.

Thanks!
Chris

2

Do you want to do this all in GL or is a feedback TOP a potential solution for you?

3

Right, look at Help → OP Snippets → TOPs → Feedback for an example.

4

You can use Cache TOPs to keep a certain number of frames cached, then use a Level TOP on the output of each one to lessen the opacity then composite them back together?