Minor code optimization, indentation fixes.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4007 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CTerrainSceneNode.cpp

@@ -579,7 +579,7 @@ namespace scene
 	void CTerrainSceneNode::preRenderCalculationsIfNeeded()
 	{
 		scene::ICameraSceneNode * camera = SceneManager->getActiveCamera();
-		if(!camera)
+		if (!camera)
 			return;
 
 		// Determine the camera rotation, based on the camera direction.
@@ -615,18 +615,15 @@ namespace scene
 		OldCameraUp = cameraUp;
 		OldCameraFOV = CameraFOV;
 
-    
 		preRenderLODCalculations();
 		preRenderIndicesCalculations();
-    
-    
 	}
 
 	void CTerrainSceneNode::preRenderLODCalculations()
 	{
 		scene::ICameraSceneNode * camera = SceneManager->getActiveCamera();
 
-    if(!camera)
+		if (!camera)
 			return;
 
 		const core::vector3df cameraPosition = camera->getAbsolutePosition();
@@ -640,23 +637,16 @@ namespace scene
 		{
 			if (frustum->getBoundingBox().intersectsWithBox(TerrainData.Patches[j].BoundingBox))
 			{
-				const f32 distance = (cameraPosition.X - TerrainData.Patches[j].Center.X) * (cameraPosition.X - TerrainData.Patches[j].Center.X) +
-					(cameraPosition.Y - TerrainData.Patches[j].Center.Y) * (cameraPosition.Y - TerrainData.Patches[j].Center.Y) +
-					(cameraPosition.Z - TerrainData.Patches[j].Center.Z) * (cameraPosition.Z - TerrainData.Patches[j].Center.Z);
+				const f32 distance = cameraPosition.getDistanceFromSQ(TerrainData.Patches[j].Center);
 
-				for (s32 i = TerrainData.MaxLOD - 1; i >= 0; --i)
+				TerrainData.Patches[j].CurrentLOD = 0;
+				for (s32 i = TerrainData.MaxLOD - 1; i>0; --i)
 				{
 					if (distance >= TerrainData.LODDistanceThreshold[i])
 					{
 						TerrainData.Patches[j].CurrentLOD = i;
 						break;
 					}
-					//else if (i == 0)
-					{
-						// If we've turned off a patch from viewing, because of the frustum, and now we turn around and it's
-						// too close, we need to turn it back on, at the highest LOD. The if above doesn't catch this.
-						TerrainData.Patches[j].CurrentLOD = 0;
-					}
 				}
 			}
 			else