How to make an object visible with a blueprint?

Development Rendering
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1

Okay, so I want to have a set of invisible platforms, which appear and stay visible when you stand on them, and I have no idea how to make this happen. I"m a visual learner, so images would be greatly appriciated.

2

make a collision box around your platform and make overlap nodes:

130305-help2.png
130305-help2.png1175×548 130 KB

3

and uncheck the visible in the cube or plattform or whatever to ensure it will be invisible in the beginning^^