Fixed clip plane related assert on linux. Hopefully the final fix of trouble related to : ca6e650a72 and 80985785 and 0128baddff

The fundamental problem was that the quad rendering was included in the boundingbox.

ApplicationCode/UserInterface/RiuViewer.cpp

@@ -198,7 +198,7 @@ RiuViewer::~RiuViewer()
 //--------------------------------------------------------------------------------------------------
 void RiuViewer::setDefaultView()
 {
-    cvf::BoundingBox bb = m_renderingSequence->boundingBox();
+    cvf::BoundingBox bb = m_mainRendering->boundingBox();
     if (!bb.isValid())
     {
         bb.add(cvf::Vec3d(-1, -1, -1));