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View Full Version : Urgent: Need Answer Quickly

torbjorn
03-10-2004, 10:22 AM
I have a room, and there's a wall at the back of the room. I want, for example, a painting to hang there. What I do now is that i create the object, put it "on the wall" with matched perspective an all, and i put a plane behind it with a matte material that recieves shadows...Ok, everything looks fine in the rendering

Now to the problem..when I render out the object and the plane that has shadows, and i want to put it on the original image of the room in photoshop - My rendered image is ok, except for that a piece of the background image is on the"plane that recieves shadows"...? Hope you get my point...What i WOULD like to have, is a plain image with the painting and the shadows, but as the shadows fades out, it should become more transparent...

This painting is going to be an object in a moviescene - with the camera locked up though. so i only need this one still image...

example below:
http://www.skinnexpo.se/alpha.jpg


BTW - I'm using 3dsmax 4.2 and photoshop - later to be added to adobe premiere pro
torbjorn
03-10-2004, 12:26 PM
ppl - this is of biiiiig interest
onickz
03-10-2004, 12:32 PM
I m not sure to understand fully where the problem is.

Do you want to get a gradient shadow "behind" the object you put on the wall ?
jussing
03-10-2004, 12:48 PM
Hello,

I'd love to help if I could understand your problem...

If I'm reading you right, all you want is to not render the background image, right? That'd give you a black background with a shadow that seems invisible, except it'll be there in the alpha channel, which will create a nice shadow in compositing.

- Jonas
torbjorn
03-10-2004, 02:30 PM
That's correct - all I want is the object and the shadow, but the problem is, if I render out with example a black or a white background - all i get is a white square OR a black square (where the black square obiously don't have any visible shadows on it)

When put the background plate that i want into premiere, and the rendered plate onto that, I can't get rid of the white matte/shadow plate that recieves shadows...

Do you see my problem?

Thanks in advance / T
Jayk2k
03-10-2004, 03:40 PM
Use the matte object material on your background plane in max.

Be sure to turn off the opaque alpha, and turn on receive shadows.
torbjorn
03-10-2004, 03:51 PM
YES, that's it - be sure to check "affect alpha" aswell...otherwise=no shadow...

Thanks
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