Friday, November 06, 2009



EDIT EDIT EDIT ** ALTERNATE VECTOR BLUR METHOD

Sure enough bloody Mental Ray lack of integration has done it again...and
MAYA HAS IT'S OWN LM2DV SHADER ---- HELLO 64 BIT VECTOR RENDERING
Well the geniuses at Autodesk have hidden some very good shaders called MIP. shaders
the one we want is called mip_motion_vector.
http://www.pixelcg.com/blog/?p=528

To enable them in the mental ray shaders GUI under materials and output shaders
go into your mentalrayCustomNodeClass.mel file in (in ../scripts/others)
http://forums.cgsociety.org/showthread.php?f=87&t=541718&page=1&pp=15

Edit: It came to my attention there is an easier way of exposing these shaders
in your script editor type
optionVar – iv “MIP_SHD_EXPOSE” 1;
restart Maya and the shaders will appear !

VOILA
your own shader group that you paid Autodesk for but they didn't want you to have it.
NOW
In the mip_ node Connect the message to mental ray miOutputShader node of whichever camera you are using via the connection editor-
you have a perfectly working LM2DV shader. Don't forget to enable vector and depth in the Legacy Output Shaders in your camera's attribute editor. Also enable motion blur with
equal shutter values as you would for the LM2DV shader.

NEW RSMB MBLUR VECTOR TECHNIQUE

Well, seems that the LM2DV shader for rendering out motion vectors is kaput. The guy who developed it has changed his website...BUT

Innovation has arrived. Seems you can render out a 2d vector pass with Mental Ray's output passes that are actually better. Here's the tutorial.


http://aloedesign.com/2008/12/maya-2d-motion-vectors-tutorial/3/
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