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Masking Glow Effect
G’day guys.
I am looking to create a strong glow effect but keep it within particular boundaries. (In this case, a bright red glow within a furnace).
I can apply a mask directly to the objects, but this doesn’t apply to the glow itself.
Any suggestions on how to keep this glow bounded?
Any help would be appreciated.
Attached is a rough idea of where I’m at. (as you can see, the glow extends outside the furnace).

Cheers
Fritz