lod_group nodes now have a reference point attribute, enabling use of lod_groups containing objects with a centre that is not at the pivot point of the lod_group node.

Numerous small bug fixes.

KREngine/kraken/KRLODGroup.cpp

@@ -13,6 +13,7 @@ KRLODGroup::KRLODGroup(KRScene &scene, std::string name) : KRNode(scene, name)
 {
     m_min_distance = 0.0f;
     m_max_distance = 0.0f;
+    m_referencePoint = KRVector3::Zero();
 }
 
 KRLODGroup::~KRLODGroup()
@@ -28,6 +29,10 @@ tinyxml2::XMLElement *KRLODGroup::saveXML( tinyxml2::XMLNode *parent)
     tinyxml2::XMLElement *e = KRNode::saveXML(parent);
     e->SetAttribute("min_distance", m_min_distance);
     e->SetAttribute("max_distance", m_max_distance);
+    
+    e->SetAttribute("reference_x", m_referencePoint.x);
+    e->SetAttribute("reference_y", m_referencePoint.y);
+    e->SetAttribute("reference_z", m_referencePoint.z);
     return e;
 }
 
@@ -44,13 +49,49 @@ void KRLODGroup::loadXML(tinyxml2::XMLElement *e)
     if(e->QueryFloatAttribute("max_distance", &m_max_distance) != tinyxml2::XML_SUCCESS) {
         m_max_distance = 0.0f;
     }
+    
+    
+    float x=0.0f, y=0.0f, z=0.0f;
+    if(e->QueryFloatAttribute("reference_x", &x) != tinyxml2::XML_SUCCESS) {
+        x = 0.0f;
+    }
+    if(e->QueryFloatAttribute("reference_y", &y) != tinyxml2::XML_SUCCESS) {
+        y = 0.0f;
+    }
+    if(e->QueryFloatAttribute("reference_z", &z) != tinyxml2::XML_SUCCESS) {
+        z = 0.0f;
+    }
+    m_referencePoint = KRVector3(x,y,z);
+}
+
+
+const KRVector3 KRLODGroup::getReferencePoint()
+{
+    return m_referencePoint;
+}
+
+void KRLODGroup::setReferencePoint(const KRVector3 &referencePoint)
+{
+    m_referencePoint = referencePoint;
+}
+
+const KRVector3 KRLODGroup::getWorldReferencePoint()
+{
+    return localToWorld(m_referencePoint);
 }
 
 bool KRLODGroup::getLODVisibility(const KRViewport &viewport)
 {
-    // Compare square distances as sqrt is expensive
-    float sqr_distance = (viewport.getCameraPosition() - getWorldTranslation()).sqrMagnitude();
-    return ((sqr_distance >= m_min_distance * m_min_distance || m_min_distance == 0) && (sqr_distance < m_max_distance * m_max_distance || m_max_distance == 0));
+    if(m_min_distance == 0 && m_max_distance == 0) {
+        return true;
+    } else {
+        // return (m_max_distance == 0); // FINDME, HACK - Test code to enable only the lowest LOD group
+        float lod_bias = 1.0f;
+        
+        // Compare square distances as sqrt is expensive
+        float sqr_distance = (viewport.getCameraPosition() - getWorldReferencePoint()).sqrMagnitude() * (lod_bias * lod_bias);
+        return ((sqr_distance >= m_min_distance * m_min_distance || m_min_distance == 0) && (sqr_distance < m_max_distance * m_max_distance || m_max_distance == 0));
+    }
 }
 
 void KRLODGroup::updateLODVisibility(const KRViewport &viewport)