public void setPipeline(RenderPipeline pipeline) {
        this.pipeline = pipeline;
    }
Sets the pipeline used by this viewport for rendering.
<p>
If null, the render manager's default pipeline will be used
to render this viewport.
<p>
default=null

@param pipeline pipeline, or null to use render manager's pipeline
jme3-core/src/main/java/com/jme3/renderer/ViewPort.java