method Triangle.isFrontFacingimport { Triangle } from "https://deno.land/x/threejs_4_deno@v121/src/math/Triangle.d.ts"; isFrontFacing(a: Vector3,b: Vector3,c: Vector3,direction: Vector3,): booleanParametersa: Vector3b: Vector3c: Vector3direction: Vector3Returnsboolean