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Caustics for video compositing
show user profile  pkarpenko
If I want to composite 3D geometry onto video footage and I want to retain the shadows of the 3D geometry, I can use the Matte/Shadow material in Max. This technique doesn't work for caustics, however (caustics don't appear on the Matte/Shadow material).

How can I compose my 3D geometry onto video footage and retain caustics?

It probably doesn't matter, but I'm using finalRender.
read 511 times
1/11/2009 10:02:00 AM (last edit: 1/11/2009 10:02:00 AM)
show user profile  pkarpenko
I guess my question also applies to reflections. How can I get a reflection on a plane that's matted and alpha'd?
read 488 times
1/11/2009 11:42:04 AM (last edit: 1/11/2009 11:42:04 AM)
show user profile  mrgrotey
Im guessing you'd need to apply a material that does recieve reflections and caustics then render off a reflection and lighting pass like that. If matte/shadow cant do it, then it cant do it.




read 482 times
1/11/2009 11:55:35 AM (last edit: 1/11/2009 11:55:35 AM)
show user profile  pkarpenko
That's what I want to know. How do I render and save off these passes individually? If a teapot is sitting on a plane, casting caustics and being reflected, how do I render the teapot, reflections and caustics without rendering the plane?
read 474 times
1/11/2009 1:01:40 PM (last edit: 1/11/2009 1:01:40 PM)
show user profile  mrgrotey
press F10 to open the render dialogue then choose the render elements tab at the top and add lighting and reflection to the list. Now when you render it will add two more windows after to the screen that contain just the reflection and lighting. you must then save as an image format that support alpha channels (transparent areas) such as .png and remove the black layer matte in photoshop, or use tga with premultiplied alpha (i use png)




read 471 times
1/11/2009 1:06:51 PM (last edit: 1/11/2009 1:06:51 PM)
show user profile  pkarpenko
Thank you! That's exactly what I was looking for and it's way easier than I thought.
read 458 times
1/11/2009 1:42:35 PM (last edit: 1/18/2009 8:34:07 AM)
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