clear background

[Master chief]

Ok hopefulyl simple , I belive there is a way to make is so that if you render an object with no set back ground that that area will become clear in the picture i know it has probley been posted how to do this before but i cant remeber what its called and all my serches come up with ways to make glass effects.

[NancyGormezano]

When you render to a tga sequence (or mov or png) you have the option to render with an alpha channel:

 

camera/output options/buffers/alpha =ON

 

you will NOT have the option if you render to jpg, avi, bmp

[robcat2075]

When you turn the ALPHA buffer ON, the background will appear black ( aka nothing) until you use the image in an app that reads the alpha channel and lets whatever you put behind your render show thru the black.

 

If you use the image in A:M as a rotoscope A:M will read the alpha channel and make the black part transparent.

 

But when you first render your image it will look black since there is nothing behind it in the render window.