To osg::AutoTransform added support for MinimumScale, MaximumScale and AutoScaleTransitionWidth parameters

and a new scheme for computing the scaling when using autoscale that introduces smooth
transitions to the scaling of the subgraph so that it looks more natural.

src/osgPlugins/ive/AutoTransform.cpp

@@ -37,8 +37,16 @@ void AutoTransform::write(DataOutputStream* out){
 
     out->writeBool(getAutoScaleToScreen());
 
+    if ( out->getVersion() >= VERSION_0025 )
+    {
+        out->writeFloat(getMinimumScale());
+        out->writeFloat(getMaximumScale());
+        out->writeFloat(getAutoScaleTransistionWidthRatio());
+    }
+
     out->writeQuat(getRotation());
     out->writeVec3(getScale());
+    
 }
 
 void AutoTransform::read(DataInputStream* in){
@@ -64,8 +72,17 @@ void AutoTransform::read(DataInputStream* in){
 
         setAutoScaleToScreen(in->readBool());
 
+        if ( in->getVersion() >= VERSION_0025 )
+        {
+            setMinimumScale(in->readFloat());
+            setMaximumScale(in->readFloat());
+            setAutoScaleTransistionWidthRatio(in->readFloat());
+        }
+
         setRotation(in->readQuat());
         setScale(in->readVec3());
+
+
     }
     else{
         throw Exception("AutoTransform::read(): Expected AutoTransform identification.");

src/osgPlugins/ive/IveVersion.h

@@ -33,8 +33,9 @@
 #define VERSION_0022 22
 #define VERSION_0023 23
 #define VERSION_0024 24
+#define VERSION_0025 25
 
-#define VERSION VERSION_0024
+#define VERSION VERSION_0025
 
 /* The BYTE_SEX tag is used to check the endian
    of the IVE file being read in.  The IVE format

src/osgPlugins/osg/AutoTransform.cpp

@@ -140,6 +140,18 @@ bool AutoTransform_readLocalData(Object& obj, Input& fr)
         iteratorAdvanced = true;
     }
 
+    if (fr.matchSequence("autoScaleTransistionWidthRatio %f"))
+    {
+        float ratio;
+        fr[1].getFloat(ratio);
+        
+        transform.setAutoScaleTransistionWidthRatio(ratio);
+
+        fr += 2;
+        iteratorAdvanced = true;
+    }
+
+
     return iteratorAdvanced;
 }
 
@@ -167,8 +179,12 @@ bool AutoTransform_writeLocalData(const Object& obj, Output& fw)
       default: fw<<"NO_ROTATION"<<std::endl; break;
     }
 
-
     fw.indent()<<"autoScaleToScreen "<<(transform.getAutoScaleToScreen()?"TRUE":"FALSE")<<std::endl;
-
+    
+    if (transform.getAutoScaleTransistionWidthRatio()!=0.25) 
+    {
+            fw.indent()<<"autoScaleTransistionWidthRatio "<<transform.getAutoScaleTransistionWidthRatio()<<std::endl;
+    }
+    
     return true;
 }