PCG Module Question

Development Programming & Scripting Blueprint
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So I have several Questions about the PCG Graph (And there “Nodes”/Module ):

  1. How do we get the Area that Cover a Specific “Actor”/Zone on the Landscape ?

There is the Landscape Node but it does NOT work on a lot of Object. Even on a PCG Volume it doesn’t do anything

So How does I get there projected (On the Ground) surface ?

  1. There is the World Ray Hit Query (WRHQ) Module, How do we make it skip a Specific “Body” ?

Currently I have a Whole water Are (Than to the Dedicated Plugin) The problem is that it doesn’t seems to be affected by water. Which is usually a good point. But Sometime I need a specific area to be seen by WRHQ. Unfortunately the Water doesn’t handle tags so I can not put an exception.

What I’m Supposed to do ?

  1. How do we call a PCG graph inside and other PCG graph ?

  2. How do we Create a PCG Volume thank to a “Nodes”/Module ? (List is kinda Huge and Name not so Understandable)

  3. How to get a Random Number ( Where is the “Rand( Min, Max )” ) ?

Thanks