[Sidefx-houdini-list] Rendering directly to mplay through MTOR

Mark Alexander malexander at sidefx.com
Thu Apr 19 12:25:56 EDT 2007

> so is it possible or not to apply 3D LUT in houdini like in shake or not?
> z

Yep, the 3D LUT can be specified in the .lut format:

Version 2
Format  any
Tye	3D
From	0 1
To	0 1
Black	0
White	1
Length  <length>
    <r> <g> <b>
    <r> <g> <b>
    <r> <g> <b>

The <length> is the cube side size (ie, 16 = 16x16x16) and there must be 
length^3 RGB tuple entries in the 3D {} section (<r> <g> <b>). In this 
instance, 0=black & 1=white.

If you're running an Nvidia card with fragment shader support, the 3D 
LUT will be applied in hardware (up to 64x64x64). Otherwise, it's 
applied in software (though using a threaded algorithm, at least).

You can use 3D LUTs in Houdini and MPlay anywhere you can use normal 1D 
LUTs, and you can generate 1D and 3D LUTs in COPs by setting up a color 
correction chain - RMB-menu on the last color correction node & selected 
"Save LUT".


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