Nice to meet you.

I would like to manipulate HDA attributes during gameplay in UnrealEngine.

Is it possible to manipulate the attribute and change its shape while playing instead of manipulating it during development?

Houdini Engine is not designed for runtime. It is meant as a tool for creating game art.

When you manipulate things Unreal connects to Houdini to cook the nodes and deliver the results. Houdini would not be available when people play your game.

Thank you for your reply.
I understand.