Sphere Effect - Alpha Background

AbidalASarraj
AbidalASarraj Posts: 63
edited November 2013 in Post-production techniques
Hello everyone,
I'm having a crazy problem with hitfilm I've applied a sphere effect to a 3d model with an alpha background and the effects lose the alpha channel replacing it with black background,,, not sure why!!
Is there a way around that or an option I can check can give me my alpha channel back?
Or I'll have to recreate the projects from ground up in After Effects???? I really don't want to :(
any help will be much appreciated :)
by the way I'm on mac version yaaa