How to create a blueprint that extends the volume(like physic volume)?

Development Programming & Scripting Blueprint
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1

I’m looking for a way to create a blueprint that extends the volume. I tried to create a C++ class that extends the volume. And I can create a blueprint that extends my custom volume c++ class. But the blueprint can not compile. Here is the error.

Default_MyVolume_c is not valid. please check mapcheck log.

And then, I can’t change the brush shape in the blueprint. It will crash.
In another way, luckily I can create my custom volume by C++ class from the Volumes tab on the Place Actors panel.
I’m trying to find a way to create the blueprint for the level designer.

2

Is not that a component rather than an actor?

3

It’s an A prefix class. AActor<-ABrush<-AVolume