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Simple Geometry Shader

Hi,

I have been googling how to implement simple geometry shaders into Unreal Engine 4.
To give you an example, I have uploaded a picture + HLSL code ( SpikeyBoiShader.txt (2.59 KB) ) of a Spikey Shader. I want to be able to achieve this in unreal engine 4.

Is this possible? Or is it impossible?
Do I do it with Materials and the Custom Node?
Or do I follow this: https://docs.unrealengine.com/en-US/Programming/Rendering/ShaderDevelopment

Im quite confused as to how to begin…

Thank you for your time.