Layer Space Transforms for rasterized layers

Hi!

Here is an expression applied to an effect's 2D point parameter applied on a 3D layer:

fromCompToSurface(toComp([value[0],value[1], -Z]))

I'd like to modify it so that it works when my layer is rasterized.

It almost works with:

toComp(fromWorld([value[0],value[1], -Z]))

but there's a difference when Z becomes big. And the difference is huge when I rotate my Layer...

Any idea?

Thanx,

François