public void setEdgesThickness(int edgesThickness) {
        this.edgesThickness = Math.max(1, Math.min(edgesThickness, 10));
        this.edgesThickness *= 0.1f;
        postshadowMat.setFloat("PCFEdge", edgesThickness);
        applyPCFEdge = true;
    }
Sets the shadow edges thickness. default is 1, setting it to lower values
can help to reduce the jagged effect of the shadow edges

@param edgesThickness the desired thickness (in tenths of a pixel, default=10)
jme3-core/src/main/java/com/jme3/shadow/PssmShadowRenderer.java