[Dvrvdr]

well the problem is; if i precompose (with adj lay on top), i have to open the precomposed composition everytime for every little setting. but if i use track matte i can set everything from the main composition.

using track matte with letssay noise effect gives no problem as the noise effect happens inside the borders (or masks), but blur effect needs to overflow the borders to give the blur effect.

thanks.

[Dvrvdr]

actually i dont know what that is.,
does the structure of a shadow catcher changes when the illumination is done by radiosity?