Cycling 74 » Topic: how to overlay a gl-model on video?

how to overlay a gl-model on video?

uea — Mon, 09 Jan 2012 11:53:02 +0000

i am new to jitter. trying to mix a gl-model with video (from a camera). mixing two videos is no problem. but how do i get the model – say the torus-example – into the correct form so that it mixes, or overlays the video. tried it with jit.matrix, alphablend, xfade, slab… is there an example out there ?

thank you in advance. jul

Re: how to overlay a gl-model on video?

goto10 — Wed, 01 Feb 2012 23:55:45 +0000

The trick is to get the video into GL land. connect the matrix you want to a jit.gl.videoplane and work with that- @blend_enable @blendmode, etc.

Hope this helps!

: j

Re: how to overlay a gl-model on video?

Thu, 02 Feb 2012 00:14:27 +0000

you need to transform the openGL rendering context to a texture, which is a 4 plane matrix, like the videos. once you have the rendering context as a texture/video, you mix it with xfade.

to get the wanted texture there are few ways. check jit.gl.asyncread help as an example.

Re: how to overlay a gl-model on video?

goto10 — Thu, 02 Feb 2012 14:09:31 +0000

check out my post over here about using “to_texture” on a jit.gl.render: http://cycling74.com/forums/topic.php?id=36911 – this example is for syphon, but it might help you.

: j