[pipcleo]

Doing a render with a background and need an alpha also.

Any way to render the image with background and an alpha in one pass ?

I notice that rendering just the alpha channel (alpha checked , diffuse unchecked) that the diffuse will also render.
Is this normal ?

[martgreg]

Check both fields render and alpha

[Bubbaloo]

You won't get a clean alpha cut out with a background image + alpha. It renders black to get proper AA edge transparency.

[rusteberg]

Any way to render the image with background and an alpha in one pass ?

you can render a depth pass and set the min value to 0 and the max value to something bogus like 9999999 and use that as alpha....

edit: combobulated reasoning on Bubbaloo's post here: http://support.nextlimit.com/display/ma ... ha+channel

although it's a bit discombobulated....