@Override
    public void write(JmeExporter exporter) throws IOException {
        super.write(exporter);
        OutputCapsule capsule = exporter.getCapsule(this);

        capsule.write(reduceMul, "reduceMul", 0.125f);
        capsule.write(spanMax, "spanMax", 8f);
        capsule.write(subPixelShift, "subPixelShift", 0.25f);
        capsule.write(vxOffset, "vxOffset", 0f);
    }
Save properties when the filter is serialized, for example when saving to
a J3O file.

@param exporter the exporter to use (not null)
@throws IOException from the exporter
jme3-effects/src/main/java/com/jme3/post/filters/FXAAFilter.java