public void setGlowFactor(float factor) {
        this.glowFactor = FastMath.clamp(factor, 0, 1);
        if (material != null) {
            material.setFloat("GlowFactor", glowFactor);
        }
    }
Sets the factor at which the glow result texture is merged with
the scene texture.
<p>
Low values favor the scene texture more, while high values make
glow more noticeable. This value is clamped between 0 and 1.
<p>
default=0.05f

@param factor
jme3-effects/src/main/java/com/jme3/post/filters/SoftBloomFilter.java