I'm looking for tutorials / information on how to blend materials and textures in Houdini; couldn't find much info in the manuals.

Use cases

1) I'd like to paint an area where material X will use Texture A where painted, texture B (could be procedural) where I have not specificed

2) I'd like to blend 2-3 procedural textures similar to how textures can be blended in photoshop, e.g. layered, masks, method (add, multiply, subtract etc.)

3) Same as #1, but blend the existing materials (e.g. glass and concrete)

Thanks in advance.

Same general response has here

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=15283 [sidefx.com]

Basically you'll want the Mix VOP.