From 5e3ec6209cbde02627564204415fd5c84d6dd6db Mon Sep 17 00:00:00 2001
From: Stuart Buchanan <stuart_d_buchanan@yahoo.co.uk>
Date: Thu, 19 Jul 2012 22:06:08 +0100
Subject: [PATCH] Add command to reload materials definitions.  Note that this
 explicitly does not attempt to delete the old materials definitions, as they
 may be in use at the time.

---
 src/Main/fg_commands.cxx | 25 +++++++++++++++++++++++++
 src/Scenery/tilemgr.cxx  |  3 +++
 2 files changed, 28 insertions(+)

diff --git a/src/Main/fg_commands.cxx b/src/Main/fg_commands.cxx
index 9c11836ae..21711098b 100644
--- a/src/Main/fg_commands.cxx
+++ b/src/Main/fg_commands.cxx
@@ -531,6 +531,30 @@ do_tile_cache_reload (const SGPropertyNode * arg)
     return true;
 }
 
+/**
+ * Reload the materials definition
+ */
+ static bool
+ do_materials_reload (const SGPropertyNode * arg)
+ {
+   SG_LOG(SG_INPUT, SG_INFO, "Reloading Materials");
+   SGMaterialLib* new_matlib =  new SGMaterialLib;
+   SGPath mpath( globals->get_fg_root() );
+   mpath.append( fgGetString("/sim/rendering/materials-file") );
+   bool loaded = new_matlib->load(globals->get_fg_root(), 
+                                  mpath.str(), 
+                                  globals->get_props());
+   
+   if ( ! loaded ) {
+       SG_LOG( SG_GENERAL, SG_ALERT,
+               "Error loading materials file " << mpath.str() );
+       return false;
+   }  
+   
+   globals->set_matlib(new_matlib);    
+   return true;   
+ }
+
 
 #if 0
 These do_set_(some-environment-parameters) are deprecated and no longer 
@@ -1531,6 +1555,7 @@ static struct {
     { "dump-terrainbranch", do_dump_terrain_branch },
     { "print-visible-scene", do_print_visible_scene_info },
     { "reload-shaders", do_reload_shaders },
+    { "reload-materials", do_materials_reload },
 
     { 0, 0 }			// zero-terminated
 };
diff --git a/src/Scenery/tilemgr.cxx b/src/Scenery/tilemgr.cxx
index 5a9679221..e05133a3e 100644
--- a/src/Scenery/tilemgr.cxx
+++ b/src/Scenery/tilemgr.cxx
@@ -108,6 +108,9 @@ void FGTileMgr::reinit()
         return;
     fgSetBool("/sim/sceneryloaded",false);
     fgSetDouble("/sim/startup/splash-alpha", 1.0);
+    
+    // Reload the materials definitions
+    _options->setMaterialLib(globals->get_matlib());
 
     // remove all old scenery nodes from scenegraph and clear cache
     osg::Group* group = globals->get_scenery()->get_terrain_branch();
-- 
2.39.5