..simple .!!

[farhaad_yousefi]

.how can i have environment map (hdr or any other) and have my alpha channel too
(=no primary rays in render..but secondary ,sure.)
i know it's silly question ..but i'm just an animator. :D

[EricTRocks]

If you inspect the environment property of the pass there should be a slider that says 'Background'. Turn that to 0 and you've got the alpha back.

Later,
Eric T.

[farhaad_yousefi]

..thanks a lot Erick ..
problem solved..!!