controlling feature class extent

Hello,

I have a feature class, that I call into a Python script, that I then convert to a raster, and perform a conditional statement with, with another raster. The input feature class - and the derived raster from it - has a different, smaller, extent than the other raster I perform the conditional with. Within the conditional statement, the feature class derived raster is part of the conditional statement; ie: basically I say 'where the feature class derived raster is null, use the other raster's value; else, use the feature class raster value". The output result is of the extent of the feature class raster, and I need the extent to be of the other raster that is input in the statement.

Let me make that easier to follow :)

statement:
OutRaster is the raster derived from the feature class. gR is a random raster.

I need outCon to have the extent of gR. I cannot seem to do this for love of chocolate! I tried to set the environment extent to what I need, but that appears to have no effect. How can I make this work?

Please let me know if I need to clarify my problem. Thanks!

Cyndy