@Override
    public void read(JmeImporter im) throws IOException {
        InputCapsule ic = im.getCapsule(this);
        center = (Vector3f) ic.readSavable("center", null);
        radius = ic.readFloat("radius", 0);
    }
Sets the radius of the sphere.

@param radius The new radius.
jme3-core/src/main/java/com/jme3/effect/shapes/EmitterSphereShape.java