Duffield

I'm trying to use a Kinect V2 to subtract the background and do a "live background subtraction" but with a "Texture Buffer" GPU delay for playback.

This is a two channel piece. I'm using "alphaglue" shader to remove the background. This works until I put it into the "texture buffer". The output video from the buffer has the background colour set in "erase_color", but when I try to put a background jit.gl.videoplane behind it, the post buffer playback image entirely blocks it.

"blend_enable 1" is set on the texture [jit.gl.videoplane] in the "texture buffer" part of the patch.

As an alternative, I tried to put the "alphaglue" shader post "texture buffer", however, this resulted in black lines on the edge of my jit.gl.videoplane for some reason.

Bit of a pinch so any help is greatly appreciated. Attached is my patch. As I'm assuming this is a general alpha question, I have it playing back video as a layer vs kinect feed. Any questions or clarifications I can do my best!

Capture_Forums.zip

Hello,
I'm trying to use a Kinect V2 to subtract the background and do a "live background subtraction" but with a "Texture Buffer" GPU delay for playback. 

This is a two channel piece. I'm using "alphaglue" shader to remove the background. This works until I put it into the "texture buffer". The output video from the buffer has the background colour set in "erase_color", but when I try to put a background jit.gl.videoplane behind it, the post buffer playback image entirely blocks it. 

Bit of a pinch so any help is greatly appreciated. Attached is my patch. As I'm assuming this is a general alpha question, I have it playing back video as a layer vs kinect feed. Any questions or clarifications I can do my best! 

Hello,
I'm trying to use a Kinect V2 to subtract the background and do a "live background subtraction" but with a "Texture Buffer" GPU delay

can-you-capture-alpha-channels-with-gl-texture-buffer

you should keep the capturing jit.gl.videoplane in the texture-delay patch as simply @automatic 0 @transform_reset 2, ensuring that it captures a correctly sized fullscreen quad of its input texture. messing with blending on this object was causing your problems.

additionally, you will need to preserve the aspect ratio using jit.gl.layer before you send to the texture delay. this is easily achieved with an extra jit.gl.layer captured to a jit.gl.node.

Capture_Forums.maxpat

Thanks so much! I may need to look it over and sync in exactly why it works this way, but this definitely solved my problem!

Hey Rob,
Thanks so much! I may need to look it over and sync in exactly why it works this way, but this definitely solved my problem! 

Can you capture Alpha Channels with GL Texture Buffer?