public void setBias(float bias) {
        this.bias = bias;
        if (ssaoMat != null) {
            ssaoMat.setFloat("Bias", bias);
        }
    }
Sets the width of the occlusion cone considered by the occludee default is 0.1f

@param bias the desired width (default=0.1)
jme3-effects/src/main/java/com/jme3/post/ssao/SSAOFilter.java