Skydome rotation

Here's how to constrain the skydome rotation to the camera:

1. Create a group for the skydome (skydome_GRP)
2. Parent constrain skydome_GRP to the layout camera (driver: camera, driven: skydome_GRP), maintaining offset and ONLY constraining translation values
3. Open the expression editor and create a new expression (skyRot)
4. Enter these expressions (<skydome> is the name of the sky GEOMETRY, not group and <camera> is the full name of the layout camera):

int $ct = `currentTime -q`;

float $rx = `getAttr -time $ct <camera>.rotateX` - `getAttr -time 1 <camera>.rotateX`; float $ry = `getAttr -time $ct <camera>.rotateY` - `getAttr -time 1 <camera>.rotateY`; float $rz = `getAttr -time $ct <camera>.rotateZ` - `getAttr -time 1 <camera>.rotateZ`;

float $deg = 0.8;

<skydome>.rotateX = $deg * $rx; <skydome>.rotateY = $deg * $ry; <skydome>.rotateZ = $deg * $rz;

Hit create expression and you're done!

Simple Fog

Hey guys, there is a really quick and easy way to get atmospheric effects in your shots by following this tutorial.

http://renderman.pixar.com/view/fog-and-atmospheric-effects#Files

The only problem is that it doesn't really work with transparency in cards very well.  I'm still working on a solution, but if you think your scene could use this we'll figure it out.  I'll keep you posted.

Brian