public void setLineDistance(float lineDistance) {
        this.lineDistance = lineDistance;
        if (material != null) {
            material.setFloat("LineDistance", lineDistance);
        }
    }
Sets minimum distance between lines drawn
Primary lines are drawn at 2*lineDistance
Secondary lines are drawn at lineDistance

@param lineDistance the desired distance (in pixels, default=4)
jme3-effects/src/main/java/com/jme3/post/filters/CrossHatchFilter.java