private void init(int shadowMapSize) {
        shadowCams = new Camera[CAM_NUMBER];
        for (int i = 0; i < CAM_NUMBER; i++) {
            shadowCams[i] = new Camera(shadowMapSize, shadowMapSize);
        }
    }
Creates a PointLightShadowRenderer

@param assetManager the application asset manager
@param shadowMapSize the size of the rendered shadowmaps (512,1024,2048,
etc...)
jme3-core/src/main/java/com/jme3/shadow/PointLightShadowRenderer.java