How to render only the object and its shadow?

[antoinebourguelle]

Hi,

I'm a french student and I work on a new project. I have done the tracking on Boujou and export to maya. On maya I have the png sequence in background with his camera. I have import a key (my object) and i have create plane for shadow. I have create physical sky. On my key I have applicate my textures (image), and on my plane i have applicate "aiShadowMatte" and I would like on Arnold render only my oject and shadow to make the compositing on AE. But when i see the alpha channel i see the plane white and not only the key (image). So, how to render my key with his shadow and a alpha background ?

Thanks for answers !

key_textures.png

render_rgb.png

render_alpha_channel.png

   

[mspeer · Accepted solution]

Hi!

At your aiShadowMatte shader is "Alpha Mask" enabled?

Also please make sure to use CPU rendering.

Please provide a scene-file for further help.

[Christoph_Schaedl]

Have you seen this video?

https://www.youtube.com/watch?v=VZiytjt5wD0

[antoinebourguelle]

Thanks !