private void initParticleMesh() {
        switch (meshType) {
            case Point:
                particleMesh = new ParticlePointMesh();
                this.setMesh(particleMesh);
                break;
            case Triangle:
                particleMesh = new ParticleTriMesh();
                this.setMesh(particleMesh);
                break;
            default:
                throw new IllegalStateException("Unrecognized particle type: " + meshType);
        }
    }
For serialization only. Do not use.
jme3-core/src/main/java/com/jme3/effect/ParticleEmitter.java