From 420e43d47dce0004f2f0c5a2c930081d94da9c61 Mon Sep 17 00:00:00 2001
From: Mathias Froehlich <Mathias.Froehlich@web.de>
Date: Sat, 24 Nov 2012 09:54:21 +0100
Subject: [PATCH] sphere: Implement sphere inside sphere.

---
 simgear/math/SGSphere.hxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/simgear/math/SGSphere.hxx b/simgear/math/SGSphere.hxx
index f46b7a0f..e4fcb096 100644
--- a/simgear/math/SGSphere.hxx
+++ b/simgear/math/SGSphere.hxx
@@ -72,6 +72,18 @@ public:
   void clear()
   { _radius = -1; }
 
+  /// Return true if this is inside sphere
+  bool inside(const SGSphere<T>& sphere) const
+  {
+    if (empty())
+      return false;
+    if (sphere.empty())
+      return false;
+
+    T dist = sphere.getRadius() - getRadius();
+    return distSqr(getCenter(), sphere.getCenter()) <= dist*dist;
+  }
+
   void expandBy(const SGVec3<T>& v)
   {
     if (empty()) {
-- 
2.39.5