Get bounds of Unity Renderer and all its children

GetCombinedBounds

public Bounds GetCombinedBounds(GameObject parent) {

		Bounds combinedBounds = new Bounds();

		//grab all child renderers
		Renderer[] renderers = GetComponentsInChildren<Renderer>(GetComponent<Renderer>());

		//grow combined bounds with every children renderer
		foreach (Renderer rendererChild in renderers) {

			if (combinedBounds.size == Vector3.zero) {
				combinedBounds = rendererChild.bounds;
			}

			combinedBounds.Encapsulate(rendererChild.bounds);
		}

		//at this point combinedBounds should be size of renderer and all its renderers children
		return combinedBounds;
	}