Hi all,

I'm attempting to make a new operator, and I'm still relatively new to Houdini in this regard, so every time I see this interface



I am always left with some questions, as there seems to be no list in the documentation about why the operators are broken up into these ‘Operator Styles’ and ‘Network Types’, e.g.

• Why are these particular ‘Operator Styles’ the ones available? Are they presets, or are they fundamentally different in some way?
  
• Is a ‘VEX Type’ ‘Geometry operator’ different from a ‘Python Type’ 'Geometry operator'? And is that different from a ‘Subnet Type’ 'Geometry operator'?
  
• 'Python Type' is one of the Styles, but I thought all operators were implemented in Python - does this type mean something else?
  

The documentation on the New Operator Type doesn't answer theses questions. 

I'm currently trying to write a particle cache exporter, so I though it needs to be an ‘Output Driver Type’, but if I do that the callback script option is greyed  out.