public void setPipeline(RenderPipeline pipeline) {
        assert pipeline != null;
        this.defaultPipeline = pipeline;
    }
Sets the default pipeline used when a ViewPort does not have a
pipeline already assigned to it.
<p>
default={@link ForwardPipeline}

@param pipeline default pipeline (not null)
jme3-core/src/main/java/com/jme3/renderer/RenderManager.java