The best way of adding vegetation to the terrain?

2

Hello again, monkeys. I know, I asked my question not that clearly. To be honest, I did not really know what I really wanted :grin: I was struggling with several problems. Sorry for that!

Anyway, in order to make my vegetation I did the following.

  1. To get the single TerrainQuads I use this method of the TerrainQuad class:

     getAllTerrainPatches(holder);

  2. After that I went through all of the terrain quads and generated the vegetation (palms in this case). I created one node per quad and added to palm trees to that node in order to have serveral chunks and not one big geometry. I created a seperate control for that:

     @Override
 public void setSpatial(Spatial spatial) {
     if (spatial == null) {
         return;
     }
     
     for (Spatial s : ((Node) spatial).getChildren()) {

         if (s instanceof TerrainQuad) {

             this.rootTerrainQuad = (TerrainQuad) s; // root terrain quad                
             ArrayList<TerrainQuad> subTerrains = getTerrainQuads(rootTerrainQuad);

             for (TerrainQuad quad : subTerrains) {
                 if (quad == null) {
                     continue; // should never be the case !!!
                 }
                 
                 int counter = 0;
                 
                 Node treeNode = new Node("TreeNode#" + quad.getQuadrant());
                 
                 int size = (int) (quad.getPatchSize() * 2); 
                 
                 for (int x = -size; x < size; x++) {
                     for (int y = -size; y < size; y++) {
                         
                         float value = fractalSum.value(x, 0, y);
                         float x1 = quad.getWorldTranslation().x;
                         float y1 = quad.getWorldTranslation().z;
                         float terrainHeight = rootTerrainQuad.getHeight(new Vector2f(x + x1, y + y1));
                         
                         if (counter < 500 && value < -0.6f && terrainHeight < treeLimit) {
                             Spatial treeClone = treeModel.clone();
                             Vector3f location = new Vector3f(x, terrainHeight, y);
                             location.addLocal(quad.getWorldTranslation());
                             treeClone.setLocalTranslation(location);
                             treeNode.attachChild(treeClone);
                             counter++;
                         }
                     }
                 }                    
                 GeometryBatchFactory.optimize(treeNode);
                 ((Node)spatial).attachChild(treeNode);
             }
         }
     }
 }

With GeometryBatchFactory.optimize(treeNode); I optimized the node.
Then I attached this node to the node where the terrain is attached to.

My scene graph looks as follows:

The scene looks like this:

trees.png1284×747 1.3 MB

Sorry again for my bad post in the beginning!