Doug MeatLoaf

My issue is concerning jit.gl.cornerpin and jit.window.

I have included an example patch down below.

My goal is to send all my material via an external projector on a 1:1 ratio screen.

I have use jit.gl.node and then send it to a jit.gl.cornerpin to be able to fine tune the output of the jit.window on the screen.

My concerns is when I need to move the jit.gl.cornerpin’s corners to adjust the size of the white part of the jit.window (which represent the screen), I get white trails on the black part the does not automatically erase themselves.

I guess the solution is something similar to the example shown in Tutorial 14 : Matrix Positioning when it says « If the matrix is not cleared, old destination areas will be left behind if they're outside the new destination region. For continuous changes, this leaves a trail of past images.

I just can’t figure out how to apply this solution here, in the gl realm.

Hello.
My issue is concerning jit.gl.cornerpin and jit.window.
I have included an example patch down below.
My goal is to send all my material via an external projector on a 1:1 ratio screen.
I have use jit.gl.node and then send it to a jit.gl.cornerpin to be able to fine tune the output of the jit.window on the screen.
It works fine actually.

My concerns is when I need to move the jit.gl.cornerpin’s corners to adjust the size of the white part of the jit.window (which represent the screen), I get white trails on the black part the does not automatically erase themselves.
I guess the solution is something similar to the example shown in Tutorial 14 : Matrix Positioning when it says « If the matrix is not cleared, old destination areas will be left behind if they're outside the new destination region. For continuous changes, this leaves a trail of past images.

I just can’t figure out how to apply this solution here, in the gl realm.
Does someone has a clue?
Thanks a lot for your help.

jit-gl-cornerpins-corners-leave-trails-in-jit-pwindow

The problem is located at the [jit.gl.render]. You have the erase color attribute set to 0 0 0 0 and since the last value is the alpha component it creates a permanent trail effect when set to 0. If you set the erase color attribute to 0 0 0 1 you will keep the black backdrop of the rendering context but it will fix the trail effect, essentially turning the trail effect off. You can also try setting the erase color attributes last argument to 0.2, 0.6, 0.9, etc to see what I'm talking about.

Thank you very much Matt for your answer and explanation.

Thank you very much Matt for your answer and explanation.
Much appreciated.
Cheers.


jit.gl.cornerpin's corners leave trails in jit.pwindow