how i can make a collision of a trail?

Consider the Spline + Spline Mesh Component combo. The mesh can be deformed to make it follow spline curvature closely, collided against, the spline can be further subdivided if needed, it’s pretty performant if you do not update the whole thing every frame; instead, update only the last 2-3 segments to keep tangents consistent - something you also have easy access to.

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