public TestFunction getBackStencilFunction() {
        return backStencilFunction;
    }
Retrieve the back stencil function.

@return the back stencil function.

@see RenderState#setStencil(boolean,
com.jme3.material.RenderState.StencilOperation,
com.jme3.material.RenderState.StencilOperation,
com.jme3.material.RenderState.StencilOperation,
com.jme3.material.RenderState.StencilOperation,
com.jme3.material.RenderState.StencilOperation,
com.jme3.material.RenderState.StencilOperation,
com.jme3.material.RenderState.TestFunction,
com.jme3.material.RenderState.TestFunction)
jme3-core/src/main/java/com/jme3/material/RenderState.java