39. Quad

The Quad is a 2D Mesh.

---

The Mesh and Geometry are created.

        // *** 1. Start (Quad Mesh + Geometry)
        Quad quad = new Quad(4,6); // 4 by 6
        geoQuad = new Geometry("quad", quad);
        geoQuad.setLocalTranslation(0, -3, 0);
  // *** 1. End

---

Some mesh information is printed.

        // *** 2. Start (Vertices and Texture coordinates)
        VertexBuffer position = quad.
                getBuffer(VertexBuffer.Type.Position);
        Vector3f[] arrayVer = BufferUtils.
                getVector3Array((FloatBuffer)position.
                getData());
        VertexBuffer texCoord = quad.
                getBuffer(VertexBuffer.Type.TexCoord);
        Vector2f[] arrayTex = BufferUtils.
                getVector2Array((FloatBuffer)texCoord.
                getData());
        System.out.println("quad has " +
                arrayVer.length +
                " vertices. Coordinates for " +
                " Vertices (x,y,z) and Texture (u,v) are: ");
        for (int i = 0; i<arrayVer.length; i++) {
            System.out.printf("%d\t%s\t%s\n",i,
                    arrayVer[i],arrayTex[i]);
        }
        // *** 2. End

---

The material shows the back shadow and we also use the transparency to blend with the background color.

        // *** 3. Start (Material)
        Material mat = new Material(assetManager, 
                "Common/MatDefs/Light/Lighting.j3md");
        mat.getAdditionalRenderState().
                setFaceCullMode(FaceCullMode.Off);
        Texture quadTex = assetManager.loadTexture(
                "Interface/monkey/Jmonkeyengine-logo.png");
        mat.setTexture("DiffuseMap", quadTex);
        mat.getAdditionalRenderState().
                setBlendMode(BlendMode.Alpha);
        geoQuad.setMaterial(mat);
        // *** 3. End

---

// JMonkey39.java

package mygame;

import com.jme3.app.SimpleApplication;
import com.jme3.light.DirectionalLight;
import com.jme3.light.SpotLight;
import com.jme3.material.Material;
import com.jme3.material.RenderState.BlendMode;
import com.jme3.material.RenderState.FaceCullMode;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.math.Vector2f;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Geometry;
import com.jme3.scene.VertexBuffer;
import com.jme3.scene.shape.Quad;
import com.jme3.system.AppSettings;
import com.jme3.texture.Texture;
import com.jme3.util.BufferUtils;
import java.nio.FloatBuffer;

public class JMonkey39 extends SimpleApplication {
    public static void main(String[] args) {
        AppSettings settings = new AppSettings(true);
        settings.setFrameRate(60);
        settings.setTitle("Monkey on a Quad !");
        JMonkey39 app = new JMonkey39();
        app.setSettings(settings);
        app.start();
    }
    
    private Geometry geoQuad;

    @Override
    public void simpleInitApp() {
        viewPort.setBackgroundColor(
                new ColorRGBA(1f,.9f,.8f,1));
        setDisplayFps(false);
        setDisplayStatView(false);
        flyCam.setEnabled(false);
        
        // *** 1. Start (Quad Mesh + Geometry)
        Quad quad = new Quad(4,6); // 4 by 6
        geoQuad = new Geometry("quad", quad);
        geoQuad.setLocalTranslation(0, -3, 0);
  // *** 1. End
        
        // *** 2. Start (Vertices and Texture coordinates)
        VertexBuffer position = quad.
                getBuffer(VertexBuffer.Type.Position);
        Vector3f[] arrayVer = BufferUtils.
                getVector3Array((FloatBuffer)position.
                getData());
        VertexBuffer texCoord = quad.
                getBuffer(VertexBuffer.Type.TexCoord);
        Vector2f[] arrayTex = BufferUtils.
                getVector2Array((FloatBuffer)texCoord.
                getData());
        System.out.println("quad has " +
                arrayVer.length +
                " vertices. Coordinates for " +
                " Vertices (x,y,z) and Texture (u,v) are: ");
        for (int i = 0; i<arrayVer.length; i++) {
            System.out.printf("%d\t%s\t%s\n",i,
                    arrayVer[i],arrayTex[i]);
        }
        // *** 2. End
        // *** 3. Start (Material)
        Material mat = new Material(assetManager, 
                "Common/MatDefs/Light/Lighting.j3md");
        mat.getAdditionalRenderState().
                setFaceCullMode(FaceCullMode.Off);
        Texture quadTex = assetManager.loadTexture(
                "Interface/monkey/Jmonkeyengine-logo.png");
        mat.setTexture("DiffuseMap", quadTex);
        mat.getAdditionalRenderState().
                setBlendMode(BlendMode.Alpha);
        geoQuad.setMaterial(mat);
        // *** 3. End
        
        /** A white, directional light source */ 
        DirectionalLight sun = new DirectionalLight();
        sun.setDirection((new Vector3f(-0.5f, -0.5f, -0.5f)).normalizeLocal());
        sun.setColor(ColorRGBA.White);
        rootNode.addLight(sun);  
        /** A cone-shaped spotlight with location, direction, range */
        SpotLight spot = new SpotLight();
        spot.setSpotRange(100);
        spot.setSpotOuterAngle(20 * FastMath.DEG_TO_RAD); 
        spot.setSpotInnerAngle(15 * FastMath.DEG_TO_RAD); 
        spot.setDirection(cam.getDirection()); 
        spot.setPosition(cam.getLocation());
        rootNode.addLight(spot);
        
        rootNode.attachChild(geoQuad);
    }

    @Override
    public void simpleUpdate(float tpf) {
        geoQuad.rotate(0,FastMath.HALF_PI*tpf,0);
    }

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

---

Output: