You are geniuses !!! THANKS !

I had tried that but i one sided it on v ray and that just make it craches so i drop the idea ! When it was right there from the beginning !!!
Too bad it won't work for 3 objects but... well i have wait so long for that solution i can spend some time creating flat images of my 3D stuffs with the right angle.

A really BIG THANKS !!

Thanks but this work perfectly on sketchup but not on vRay... Or i could not make it work using that render plugin.
(I use the "Happy shadow" component, easy to find and remenber)

Hi

I've been cherching an answer to this for quite some time and haven't found the answer yet.
I "simply" want to have some object invisible during the render that would still cast shadows.

If you wonder why well i like to have my trees and people on my render to be add on photoshop (and no, a png file would not help me there, i like to set some transparency maybe a blur and all kind of effects that only photoshop can do). I also like to cast some trees shadow on my model to give them some "texture" etc... ect...

I know how to do that on sketchup (apply a transparent .png texture, sketchup will cast the shadow but the shape won't be visible).
But v-ray can't be fooled so easily...

If anyone had an answer that would make me really happy

PS : for tree i place them outside of the view field BUT for a large urban planning render i can't do that... so that's also a cheap solution i don't want to use.
PSS : Sorry for any english mistakes i'm a french frog eater.