@Override
    protected void initFilter(AssetManager manager,
            RenderManager renderManager, ViewPort vp, int w, int h) {
        material = new Material(manager, "Common/MatDefs/Post/FXAA.j3md");   
        material.setFloat("SubPixelShift", subPixelShift);
        material.setFloat("VxOffset", vxOffset);
        material.setFloat("SpanMax", spanMax);
        material.setFloat("ReduceMul", reduceMul);
    }
<a href="http://www.geeks3d.com/20110405/fxaa-fast-approximate-anti-aliasing-demo-glsl-opengl-test-radeon-geforce/3/">demo</a>
<a href="http://developer.download.nvidia.com/assets/gamedev/files/sdk/11/FXAA_WhitePaper.pdf">whitepaper</a>

@author Phate666 (adapted to jme3)
jme3-effects/src/main/java/com/jme3/post/filters/FXAAFilter.java