From: Stuart Buchanan <stuart_d_buchanan@yahoo.co.uk>
Date: Mon, 2 Jan 2012 23:10:20 +0000 (+0000)
Subject: Adjust LoD ranges for 3D clouds so that they become visible at maximum range, taking... 
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=cc47d33b320b910f7a93417db9a4ea567c8852a3;p=simgear.git

Adjust LoD ranges for 3D clouds so that they become visible at maximum range, taking into account the current cloud visibility range, and the possible size of the clouds themselves.
---

diff --git a/simgear/scene/sky/cloudfield.cxx b/simgear/scene/sky/cloudfield.cxx
index 1a801909..0ff07144 100644
--- a/simgear/scene/sky/cloudfield.cxx
+++ b/simgear/scene/sky/cloudfield.cxx
@@ -69,7 +69,8 @@ double SGCloudField::timer_dt = 0.0;
 float SGCloudField::view_distance = 20000.0f;
 bool SGCloudField::wrap = true;
 float SGCloudField::RADIUS_LEVEL_1 = 5000.0f;
-float SGCloudField::RADIUS_LEVEL_2 = 1000.0f;
+float SGCloudField::RADIUS_LEVEL_2 = 2000.0f;
+float SGCloudField::MAX_CLOUD_DEPTH = 2000.0f;
 
 SGVec3f SGCloudField::view_vec, SGCloudField::view_X, SGCloudField::view_Y;
 
@@ -186,9 +187,10 @@ void SGCloudField::applyVisRange(void)
     for (unsigned int i = 0; i < placed_root->getNumChildren(); i++) {
         osg::ref_ptr<osg::LOD> lodnode1 = (osg::LOD*) placed_root->getChild(i);
         for (unsigned int j = 0; j < lodnode1->getNumChildren(); j++) {
+            lodnode1->setRange(j, 0.0f, view_distance + RADIUS_LEVEL_1 + RADIUS_LEVEL_2 + MAX_CLOUD_DEPTH);
             osg::ref_ptr<osg::LOD> lodnode2 = (osg::LOD*) lodnode1->getChild(j);
             for (unsigned int k = 0; k < lodnode2->getNumChildren(); k++) {
-                lodnode2->setRange(k, 0.0f, view_distance);
+                lodnode2->setRange(k, 0.0f, view_distance + MAX_CLOUD_DEPTH);
             }
         }
     }
@@ -317,11 +319,11 @@ void SGCloudField::addCloudToTree(osg::ref_ptr<osg::PositionAttitudeTransform> t
     if (!found) {
         // No suitable leave node was found, so we need to add one.
         lodnode = new osg::LOD();
-        lodnode1->addChild(lodnode, 0.0f, 4*RADIUS_LEVEL_1);
+        lodnode1->addChild(lodnode, 0.0f, view_distance + RADIUS_LEVEL_1 + RADIUS_LEVEL_2 + MAX_CLOUD_DEPTH);
     }
 
     transform->setPosition(pos);
-    lodnode->addChild(transform.get(), 0.0f, view_distance);
+    lodnode->addChild(transform.get(), 0.0f, view_distance + MAX_CLOUD_DEPTH);
 
     lodnode->dirtyBound();
     lodnode1->dirtyBound();
diff --git a/simgear/scene/sky/cloudfield.hxx b/simgear/scene/sky/cloudfield.hxx
index 1de2fce3..1199c9c5 100644
--- a/simgear/scene/sky/cloudfield.hxx
+++ b/simgear/scene/sky/cloudfield.hxx
@@ -76,6 +76,10 @@ private:
   static float RADIUS_LEVEL_1;
   static float RADIUS_LEVEL_2;
 
+  // Theoretical maximum cloud depth, used for fudging the LoD
+  // ranges to ensure that clouds become visible at maximum range
+  static float MAX_CLOUD_DEPTH;
+
 	// this is a relative position only, with that we can move all clouds at once
 	SGVec3f relative_position;