48. Terrain

A simple stepped terrain is created.

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The terrain material is based on Terrain.j3md. This requires a few Image Textures. The Alpha gives weight of Red, Green, and Blue Textures. We also need a height map.

        // *** 1. Start (Terrain Unshaded material)
        materialTerrain = new Material(assetManager,
                "Common/MatDefs/Terrain/Terrain.j3md");
        // *** 1. End

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This is a simple image for Alpha. The portion of terrain devoted to the three textures is about equal.

        // *** 2. Start (Alpha Texture)
        materialTerrain.setTexture("Alpha", assetManager.
                loadTexture("Textures/Ex48/redgreenblue.png"));
        // *** 2. End

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The red texture is based on this image, based on the burlwood pattern in GIMP.

        // *** 3. Start (Red Texture)
        Texture burlwood = assetManager.loadTexture(
                "Textures/Ex48/burlwood.png");
        burlwood.setWrap(Texture.WrapMode.Repeat);
        materialTerrain.setTexture("Tex1", burlwood);
        materialTerrain.setFloat("Tex1Scale", 64);
        // *** 3. End

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The green texture is based on this image, based on the craters pattern in GIMP.

        // *** 4. Start (Green Texture)
        Texture craters = assetManager.loadTexture(
                "Textures/Ex48/craters.png");
        craters.setWrap(Texture.WrapMode.Repeat);
        materialTerrain.setTexture("Tex2", craters);
        materialTerrain.setFloat("Tex2Scale", 64);
        // *** 4. End

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The blue texture is based on this image, based on the road pattern in GIMP.

        // *** 5. Start (Blue Texture)
        Texture road = assetManager.loadTexture(
                "Textures/Ex48/road.png");
        road.setWrap(Texture.WrapMode.Repeat);
        materialTerrain.setTexture("Tex3", road);
        materialTerrain.setFloat("Tex3Scale", 64);
        // *** 5. End

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This is a gray-scale height map. The three regions corresponds to 0, 128, and 255, so the two steps are almost equal in size.

        // *** 6. Start (Height map)
        AbstractHeightMap heightmap = null;
        Texture heightMapImage = assetManager.loadTexture(
                "Textures/Ex48/heightmap.png");
        heightmap = new ImageBasedHeightMap(
                heightMapImage.getImage());
        heightmap.load();
        // *** 6. End

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Finally, the terrain can be added to the rootNode.

        // *** 7. Start (terrain)
        terrain = new TerrainQuad("terrain",
                129, 513, // patch + 1, height size + 1
                heightmap.getHeightMap()); // float array
        terrain.setMaterial(materialTerrain);
        terrain.setLocalScale(.1f, .1f, .1f);
        float ang = 45*FastMath.DEG_TO_RAD;
        terrain.rotate(ang, 0, ang);
        rootNode.attachChild(terrain);
        cam.setLocation(new Vector3f(0,0,150)); // far away
        // *** 7. End 

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// JMonkey48.java

package mygame;

import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.terrain.geomipmap.TerrainQuad;
import com.jme3.terrain.heightmap.AbstractHeightMap;
import com.jme3.terrain.heightmap.ImageBasedHeightMap;
import com.jme3.texture.Texture;

public class JMonkey48 extends SimpleApplication {

    public static void main(String[] args) {
        JMonkey48 app = new JMonkey48();
        app.start();
    }
    
    private TerrainQuad terrain;
    Material materialTerrain;

    @Override
    public void simpleInitApp() {
        
        viewPort.setBackgroundColor(ColorRGBA.LightGray);
        setDisplayFps(false);
        setDisplayStatView(false);
        flyCam.setMoveSpeed(100); // faster camera
        
        // *** 1. Start (Terrain Unshaded material)
        materialTerrain = new Material(assetManager,
                "Common/MatDefs/Terrain/Terrain.j3md");
        // *** 1. End
        
        // *** 2. Start (Alpha Texture)
        materialTerrain.setTexture("Alpha", assetManager.
                loadTexture("Textures/Ex48/redgreenblue.png"));
        // *** 2. End
        
        // *** 3. Start (Red Texture)
        Texture burlwood = assetManager.loadTexture(
                "Textures/Ex48/burlwood.png");
        burlwood.setWrap(Texture.WrapMode.Repeat);
        materialTerrain.setTexture("Tex1", burlwood);
        materialTerrain.setFloat("Tex1Scale", 64);
        // *** 3. End
 
        // *** 4. Start (Green Texture)
        Texture craters = assetManager.loadTexture(
                "Textures/Ex48/craters.png");
        craters.setWrap(Texture.WrapMode.Repeat);
        materialTerrain.setTexture("Tex2", craters);
        materialTerrain.setFloat("Tex2Scale", 64);
        // *** 4. End
 
        // *** 5. Start (Blue Texture)
        Texture road = assetManager.loadTexture(
                "Textures/Ex48/road.png");
        road.setWrap(Texture.WrapMode.Repeat);
        materialTerrain.setTexture("Tex3", road);
        materialTerrain.setFloat("Tex3Scale", 64);
        // *** 5. End
 
        // *** 6. Start (Height map)
        AbstractHeightMap heightmap = null;
        Texture heightMapImage = assetManager.loadTexture(
                "Textures/Ex48/heightmap.png");
        heightmap = new ImageBasedHeightMap(
                heightMapImage.getImage());
        heightmap.load();
        // *** 6. End
 
        // *** 7. Start (terrain)
        terrain = new TerrainQuad("terrain",
                129, 513, // patch + 1, height size + 1
                heightmap.getHeightMap()); // float array
        terrain.setMaterial(materialTerrain);
        terrain.setLocalScale(.1f, .1f, .1f);
        float ang = 45*FastMath.DEG_TO_RAD;
        terrain.rotate(ang, 0, ang);
        rootNode.attachChild(terrain);
        cam.setLocation(new Vector3f(0,0,150)); // far away
        // *** 7. End 
    }
    
    @Override
    public void simpleUpdate(float tpf) {
    }

    @Override
    public void simpleRender(RenderManager rm) {
    }
}

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Output: