Forums > MaxMSP

alpha video videoplanes

February 15, 2006 | 9:46 am

Hello everybody,

I’m a student of the Art Academy of Rotterdam and my max teacher run away to Iceland ore something. This is the reason to ask some help over here :-)

Last year I build a audiovisual playtoy: http://www.beatnologic.com/site/content.php?id=250
Some video’s keyed over a background image.

Now I want to do the same but then with openGl videoplanes. Everything work fine exept the alpha stuff.

I don’t know what I’n doing wrong. Is it posible to do something linke this, http://www.beatnologic.com/site/content.php?id=283
but then with alpha video’s?

Does anybody, maybe has a example patch and a demo mov with alpha channel?

Thanks! Jonas


February 15, 2006 | 12:24 pm

So you have the people against a green screen or do you have the
videos alpha keyed already?

You can a a alpha key very easy when you do something using the first
input of a jit.pack and splitting the channels up first with a
jit.unpack.

I don’t have acces to max to create a patch for you but this tip will
point you in a right direction.


February 15, 2006 | 4:45 pm

make sure you have @blend_enable 1 attribute in your video plane as
well :)

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