setFromPointsAndIndices( points, i0, i1, i2 ) {

		this.a.copy( points[ i0 ] );
		this.b.copy( points[ i1 ] );
		this.c.copy( points[ i2 ] );

		return this;

	}
Sets the triangle's vertices by copying the given array values.

@param {Array<Vector3>} points - An array with 3D points.
@param {number} i0 - The array index representing the first corner of the triangle.
@param {number} i1 - The array index representing the second corner of the triangle.
@param {number} i2 - The array index representing the third corner of the triangle.
@return {Triangle} A reference to this triangle.