public void setColorInfluenceLine(float colorInfluenceLine) {
        this.colorInfluenceLine = colorInfluenceLine;
        if (material != null) {
            material.setFloat("ColorInfluenceLine", colorInfluenceLine);
        }
    }
Sets color influence of original image on lines drawn

@param colorInfluenceLine the desired factor (default=0.8)
jme3-effects/src/main/java/com/jme3/post/filters/CrossHatchFilter.java