ligh / shadows through alpha channel of a plane

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

Thread Tools Search this Thread Display Modes
  11 November 2009
ligh / shadows through alpha channel of a plane

Hi there...

I am facing a problem with rendering a scene... well, I still am in the "test different stuff" fase to see how far can I go...

I'll explain my difficulty, in the scene I have a plane object with a Lambert texture on it, the lambert contains a video file (tiff sequence + alpha), this video has a dancing woman filmed in green screen.. Tha greenscreen was composited to transparency in AE, so, now I have a clean tiff file with a very nice transparency.. until now is everything ok...
The problem is that, when I illuminate the plane on the scene and turn on the shadow of the light, the shadow projects the plane shape a not the womans shape as I wanted...

Is there any way to solve this issue? I want the shadow to assume the woman shape

There is the file that shows the problem... you can easily were does the shadow start projecting and the shape the it has comparing to the person that is dancing.

Thats it...

Thank you

  11 November 2009
On your file node, do you have "Alpha is Luminance" checked?

Alternatively, you could use a mia_material_x and use the cutout opacity slot, which is designed solely for alpha-channel cutouts. This is for mental ray though; if you're rendering in Maya software, it might not help...
Commodore 64 @ 1MHz
1541 Floppy Drive

"Like stone we battle the wind... Beat down and strangle the rains..."
  11 November 2009
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
Thread Closed share thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Society of Digital Artists

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump

All times are GMT. The time now is 12:47 PM.

Powered by vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.