Here are 2 little utilities, "Attribute to bitmap" and "Bitmap to attribute"
Attribute to bitmap:
Simple node which allows the user to bake attribute values to a bitmap (tga, exr, rat...).
Bitmap to attribute:
Simple SOP node which allows to read data from a bitmap to point attribute.
- use only luminance toggle
- Multiplier ( intensity )
- Output Attribute Name
- Change the class of the output attribute ( by default it's point ).