Creating a splash effect on terrain?

Currently working on a fighting that involves having a circle under the enemy as highlight.
However, the game uses smooth terrain, so how would it be possible to cast a part that matches the terrain shape whilst not using too many raycasts for performance (as it will be ran every hearbeat)?

EDIT: The idea I thought of is raycasting the shape and recreating it from wedges, however I don’t think its efficient enough.

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