public VertexBuffer getLodLevel(int lod) {
        return lodLevels[lod];
    }
Returns the lod level at the given index.

@param lod The lod level index, this does not include
the main index buffer.
@return The LOD index buffer at the index

@throws IndexOutOfBoundsException If the index is outside of the
range [0, {@link #getNumLodLevels()}].

@see #setLodLevels(com.jme3.scene.VertexBuffer[])
jme3-core/src/main/java/com/jme3/scene/Mesh.java