public void setLineColor(ColorRGBA lineColor) {
        this.lineColor = lineColor;
        if (material != null) {
            material.setColor("LineColor", lineColor);
        }
    }
Sets color used to draw lines

@param lineColor the desired color (alias created, default=(0,0,0,1))
jme3-effects/src/main/java/com/jme3/post/filters/CrossHatchFilter.java