cull by distance, to improve performance

src/physics/irr_debug_drawer.cpp

@@ -22,7 +22,9 @@
 #include "karts/abstract_kart.hpp"
 #include "modes/world.hpp"
 
+#include <ISceneManager.h>
 #include <ISceneNode.h>
+#include <ICameraSceneNode.h>
 
 IrrDebugDrawer::IrrDebugDrawer()
 {
@@ -59,6 +61,10 @@ void IrrDebugDrawer::drawLine(const btVector3& from, const btVector3& to,
     video::SColor c(255, (int)(color.getX()*255), (int)(color.getY()*255),
                          (int)(color.getZ()*255)                          );
 
+    //World::getWorld()->getCa
+
+    if (from.distance2(m_camera_pos) > 10000) return;
+
     std::vector<float>& v = m_lines[c];
     v.push_back(from.getX());
     v.push_back(from.getY());
@@ -77,6 +83,9 @@ void IrrDebugDrawer::beginNextFrame()
     {
         it->second.clear();
     }
+
+    scene::ICameraSceneNode* camera = irr_driver->getSceneManager()->getActiveCamera();
+    m_camera_pos = camera->getPosition();
 }
 
 /* EOF */

src/physics/irr_debug_drawer.hpp

@@ -44,6 +44,8 @@ public:
 
     std::map<video::SColor, std::vector<float>> m_lines;
 
+    Vec3 m_camera_pos;
+
 protected:
     virtual void    setDebugMode(int debug_mode) {}
     /** Callback for bullet: if debug drawing should be done or not.