Represents a billboard.
        /// <summary>
        /// Updates the geometry.
        /// </summary>
        protected void UpdateGeometry()
        {
            var bb = new Billboard(
                this.Position,
                this.Width,
                this.Height,
                this.HorizontalAlignment,
                this.VerticalAlignment,
                this.DepthOffset);

            this.Mesh.Positions = this.builder.GetPositions(new[] { bb }, new Vector());
        }
        /// <summary>
        /// Updates the geometry.
        /// </summary>
        protected void UpdateGeometry()
        {
            var bb = new Billboard(
                this.Position,
                this.Width,
                this.Height,
                this.HorizontalAlignment,
                this.VerticalAlignment,
                this.DepthOffset);

            this.Mesh.Positions = this.builder.GetPositions(new[] { bb });
        }