From 999869da24b2937939850dcd575db9a894c0af35 Mon Sep 17 00:00:00 2001
From: Aesylwinn <kyleacooley@gmail.com>
Date: Fri, 18 Mar 2016 14:02:24 -0400
Subject: [PATCH] Position camera above, near, and looking at the scene.

---
 apps/opencs/view/render/cameracontroller.cpp |  8 ++++++++
 apps/opencs/view/render/cameracontroller.hpp |  4 ++++
 apps/opencs/view/render/scenewidget.cpp      | 19 ++++++++++++++++++-
 apps/opencs/view/render/scenewidget.hpp      |  3 +++
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/apps/opencs/view/render/cameracontroller.cpp b/apps/opencs/view/render/cameracontroller.cpp
index 8fc9c4801..7f8f9013c 100644
--- a/apps/opencs/view/render/cameracontroller.cpp
+++ b/apps/opencs/view/render/cameracontroller.cpp
@@ -69,6 +69,14 @@ namespace CSVRender
         mMouseScalar = value;
     }
 
+    void CameraController::setSceneBounds(const osg::BoundingBox& bounds, const osg::Vec3d& up)
+    {
+        osg::Vec3d eye = osg::Vec3d(bounds.xMax(), bounds.yMax(), bounds.zMax());
+        osg::Vec3d center = bounds.center();
+
+        getCamera()->setViewMatrixAsLookAt(eye, center, up);
+    }
+
     void CameraController::setModified()
     {
         mModified = true;
diff --git a/apps/opencs/view/render/cameracontroller.hpp b/apps/opencs/view/render/cameracontroller.hpp
index 44e35069b..156b1cb56 100644
--- a/apps/opencs/view/render/cameracontroller.hpp
+++ b/apps/opencs/view/render/cameracontroller.hpp
@@ -3,6 +3,7 @@
 
 #include <string>
 
+#include <osg/BoundingBox>
 #include <osg/ref_ptr>
 #include <osg/Vec3d>
 
@@ -41,6 +42,9 @@ namespace CSVRender
             void setCamera(osg::Camera*);
             void setMouseScalar(double value);
 
+            // moves the camera to an intelligent position
+            void setSceneBounds(const osg::BoundingBox& bounds, const osg::Vec3d& up);
+
             virtual bool handleKeyEvent(QKeyEvent* event, bool pressed) = 0;
             virtual bool handleMouseMoveEvent(std::string mode, int x, int y) = 0;
 
diff --git a/apps/opencs/view/render/scenewidget.cpp b/apps/opencs/view/render/scenewidget.cpp
index d7049c1b5..ea282ffcd 100644
--- a/apps/opencs/view/render/scenewidget.cpp
+++ b/apps/opencs/view/render/scenewidget.cpp
@@ -11,6 +11,8 @@
 #include <osgViewer/CompositeViewer>
 #include <osgViewer/ViewerEventHandlers>
 #include <osg/LightModel>
+#include <osg/BoundingBox>
+#include <osg/ComputeBoundsVisitor>
 
 #include <osgGA/TrackballManipulator>
 #include <osgGA/FirstPersonManipulator>
@@ -164,6 +166,7 @@ SceneWidget::SceneWidget(boost::shared_ptr<Resource::ResourceSystem> resourceSys
     , mFreeCamControl(new FreeCameraController())
     , mOrbitCamControl(new OrbitCameraController())
     , mCurrentCamControl(mFreeCamControl.get())
+    , mCamPositionSet(false)
 {
     selectNavigationMode("free");
 
@@ -306,7 +309,21 @@ void SceneWidget::keyReleaseEvent (QKeyEvent *event)
 
 void SceneWidget::update(double dt)
 {
-    mCurrentCamControl->update(dt);
+    if (mCamPositionSet)
+    {
+        mCurrentCamControl->update(dt);
+    }
+    else
+    {
+        osg::ComputeBoundsVisitor boundsVisitor;
+        osg::BoundingBox &boundingBox(boundsVisitor.getBoundingBox());
+
+        mRootNode->accept(boundsVisitor);
+
+        mCurrentCamControl->setSceneBounds(boundingBox, CameraController::WorldUp);
+
+        mCamPositionSet = true;
+    }
 }
 
 void SceneWidget::settingChanged (const CSMPrefs::Setting *setting)
diff --git a/apps/opencs/view/render/scenewidget.hpp b/apps/opencs/view/render/scenewidget.hpp
index 7dcc74047..dfda1f96c 100644
--- a/apps/opencs/view/render/scenewidget.hpp
+++ b/apps/opencs/view/render/scenewidget.hpp
@@ -120,6 +120,9 @@ namespace CSVRender
 
             std::map<std::pair<Qt::MouseButton, bool>, std::string> mButtonMapping;
 
+        private:
+            bool mCamPositionSet;
+
         public slots:
             void update(double dt);