jMonkeyEngine 3.0 Beginner's Guide

Time for action – plant a tree

Placing a tree on flat ground is easy: you know the y coordinate of the ground plane.

Let's try placing a tree on a hilly terrain.

1. Make a copy of TerrainSimple.java and name the class Trees.java. Remember to also refactor the first line of the main() method to the following:

   Trees app = new Trees();

2. Keep the code that creates HillHeightMap(1025, 1000, 50, 100, (byte) 3).
3. Load a tree model from the assets folder included with this book.

   public void simpleInitApp() {
     Spatial treeGeo = assetManager.loadModel("Models/Tree/Tree.j3o");
     treeGeo.scale(5); // make tree bigger
     treeGeo.setQueueBucket(Bucket.Transparent); 
     // transparent leaves
     rootNode.attachChild(treeGeo);

4. Place the tree at (-30,y,-30) on the terrain.

    Vector3f treeLoc ...