Forums > MaxMSP

OpenGL + video with transparent background + Jit.gl.Hap

September 1, 2013 | 11:51 am

Dear Everybody,

I’m under a bit of time pressure, and will therefore ask a humble question :)

I have a bunch of videos I want to run using jit.gl.hap. Everything works fine, until today, where I found out that I have to key out a bunch of backgrounds.

I want to use the jit.gl.hap encoded with HAP-ALPHA, but I don’t get how to make OpenGL show my video with the alpha mask I have applied..

Any help will be very greatly appreciated.. A solution could also be using other OpenGL stuff, and not jit.gl.HAP, but it’s a little heavy on the computer, so HAP will be great!

Hope to hear from you (btw. OpenGL in jitter – and in general – is really new, so I might need a little bit of a newbie explanation :)

All the best,
Lasse


September 1, 2013 | 11:51 am

an example of a HAP-ALPHA encodet video is found here:

https://dl.dropboxusercontent.com/u/4496379/HAP_ALPHA-TEST.zip


September 1, 2013 | 12:15 pm

the answer is "blend_enable 1" to the jit.gl.videoplane


September 1, 2013 | 1:15 pm

Good for you, man. Keep at it! :)


September 2, 2013 | 11:29 am

you will probably also want to disable depth on the objects that are to be alpha-blended (@depth_enable 0). you then use the @layer attribute to control the layer order.


September 8, 2013 | 1:11 pm

ah cool! thanks :)


Viewing 6 posts - 1 through 6 (of 6 total)