public void setStartSize(float startSize) {
        this.startSize = startSize;
    }
Set the start size of the particles spawned.

<p>The particle size at any time is determined by blending the start size
and end size based on the particle's current time of life relative
to its end of life.

@param startSize the start size of the particles spawned.
jme3-core/src/main/java/com/jme3/effect/ParticleEmitter.java