First shader

I’m looking to get started with osl shaders and I’m hitting some snags getting my hello world diffuse running.

  1. There is no coloOut slot on my script node. I think that osl is disabled, my current build is (2.65.10 r54417) I tried searching through add ons, couldn’t find a way to enable it. Do I need to upgrade to 2.66? or downgrade?

you have to enable Osl : there is a checkbox near the top of the render panel (under render properties ,i.e. the photocamera shaped icon). also make sure you’ve selected Cycles as your rendering engine (osl is not available for Blender internal)