Opacity mapping

I have created an opacity map that would work in a program like 3ds Max or Maya, to go over a texture to cut out the unwanted part of a shader but I am having an awful lot of trouble getting it to work in Blender, I haven’t been able to find any tutorials on the subject within blender either.
Help would be much appreciated :smiley:

Here is a link to a little render
http://www.deviantart.com/deviation/27860270/

Have you tried using your mask as a Stencil texture? This page in the Blender Wiki should help:

http://mediawiki.blender.org/index.php/Manual/PartIV/Map_To#Multiple_Textures

that’s great, just what i was loooking for:)