Changeset 169 for experimental/TerrainTest/myTerrainTechnique.cpp

Timestamp:

Dec 1, 2010, 8:23:26 PM (13 years ago)

Author:

Torben Dannhauer

Message:

Step1: modifying terrain with arbitrary values: done :)
Step2: modify with the corresponding values: todo :)

File:

• experimental/TerrainTest/myTerrainTechnique.cpp (modified) (1 diff)

experimental/TerrainTest/myTerrainTechnique.cpp

@@ -20 +20 @@
 }
 
-void myTerrainTechnique::update(osgUtil::UpdateVisitor* uv)
+void myTerrainTechnique::init(int dirtyMask, bool assumeMultiThreaded)
 {
+        /* The heightfield es extracted from the tile in the techniques init function. technique->init() calls  technique->generateGeometry() which creates the drawable according to the heightfield.
+        To modify the height, the heightfield must be modified prior to the original techniques init() function.
+
+        To modiy the drawable shape (e.g. Cutting wholes in the area), the function technique->generateGeometry() must be modified.
+        */
+
         HeightFieldLayer* hfl = dynamic_cast<HeightFieldLayer*>( getTerrainTile()->getElevationLayer() );
         osg::HeightField* h = hfl->getHeightField();
         h->setHeight( 0,0, 1000);
 
-    GeometryTechnique::update( uv); 
+    GeometryTechnique::init(dirtyMask, assumeMultiThreaded);
 }