// render on top
if (this.avatarStep.isEnabled) {
    // background
    compositingStep.effect.setFloat4('uAvatarData', 1, 0, 0, 0);
    compositingStep.draw(effectRenderer);
    this.avatarStep.render();
    if (this.effectRenderer) {
        effectRenderer.applyEffectWrapper(compositingStep.effectWrapper);
        effectRenderer.setViewport();
    }
    compositingStep.effect.setFloat4('uAvatarData', 1, 1, 0, 0);
    compositingStep.draw(effectRenderer);
} else {
    // render compositing effect
    compositingStep.draw(effectRenderer);
}