From da6b4df00a75e726671b508acfc14f29f1d7b7af Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 18 Jul 2019 12:18:04 +0100
Subject: [PATCH] Added handling of zero radius models

---
 src/osgGA/CameraManipulator.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/osgGA/CameraManipulator.cpp b/src/osgGA/CameraManipulator.cpp
index 30e3febe1..8e551277a 100644
--- a/src/osgGA/CameraManipulator.cpp
+++ b/src/osgGA/CameraManipulator.cpp
@@ -96,8 +96,10 @@ void CameraManipulator::computeHomePosition(const osg::Camera *camera, bool useB
         OSG_INFO<<"    boundingSphere.center() = ("<<boundingSphere.center()<<")"<<std::endl;
         OSG_INFO<<"    boundingSphere.radius() = "<<boundingSphere.radius()<<std::endl;
 
+        double radius = osg::maximum(double(boundingSphere.radius()), 1e-6);
+
         // set dist to default
-        double dist = 3.5f * boundingSphere.radius();
+        double dist = 3.5f * radius;
 
         if (camera)
         {
@@ -110,7 +112,7 @@ void CameraManipulator::computeHomePosition(const osg::Camera *camera, bool useB
                 double horizontal2 = fabs(top - bottom) / zNear / 2.;
                 double dim = horizontal2 < vertical2 ? horizontal2 : vertical2;
                 double viewAngle = atan2(dim,1.);
-                dist = boundingSphere.radius() / sin(viewAngle);
+                dist = radius / sin(viewAngle);
             }
             else
             {