Hi, I created lightning effect in Houdini. Now it should run in UE runtime. It only plays houdini. How to hit play button in UE?

HDA's don't run in real-time using HEngine for Unreal. You could convert the ending of the lightning effect as a mesh and then use a material to control when it appears. The mesh would have to be the complete lightning effect from top to bottom.

Depending on the look you are going for, you could also do it in Unreal. https://www.youtube.com/watch?v=rT1BHPeL6E4&t=1s [www.youtube.com]