public void setLineThickness(float lineThickness) {
        this.lineThickness = lineThickness;
        if (material != null) {
            material.setFloat("LineThickness", lineThickness);
        }
    }
Sets the thickness of lines drawn

@param lineThickness the desired thickness (in pixels, default=1)
jme3-effects/src/main/java/com/jme3/post/filters/CrossHatchFilter.java