jMonkeyEngine-wiki/docs/modules/tutorials/pages/beginner/hellovector.adoc

= hellovector
:author:
:revnumber:
:revdate: 2020/07/06


image:jme3/beginner/hellovectorsumm2.png[hellovectorsumm2.png,width="",height=""]

HelloVectorSumm.java

[source,java]
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package org.jmonkey.chapter2.hellovector;

import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Geometry;
import com.jme3.scene.Node;
import com.jme3.scene.shape.Box;
import org.jmonkey.utils.Debug;
import org.jmonkey.utils.MaterialUtils;
import org.jmonkey.utils.SpatialUtils;

/**
 Example Vector Summ

 @author Alex Cham aka Jcrypto
 */
public class HelloVectorSumm extends SimpleApplication
{

    private Node vctrNode = SpatialUtils.makeNode("vectorNode");
    //
    private Vector3f vctrNodeLoc = new Vector3f(64.0f, 64.0f, 64.0f);
    private Vector3f camLocVctr = new Vector3f(512.0f, 64.0f, 0.0f);
    //
    private Vector3f vctrNodeSpatLoc = new Vector3f(64.0f, 128.0f, -32.0f);
    //
    private Vector3f vctrSumm = null;
    private Vector3f scale = new Vector3f(8, 8, 8);

    public static void main(String[] args)
    {
        HelloVectorSumm app = new HelloVectorSumm();
        //app.setShowSettings(false);
        app.start();
    }

    @Override
    public void simpleInitApp()
    {
        cam.setLocation(camLocVctr);
        cam.lookAt(Vector3f.ZERO, cam.getUp());
        flyCam.setMoveSpeed(100.0f);
        //
        Debug.showNodeAxes(assetManager, rootNode, 128);
        Debug.attachWireFrameDebugGrid(assetManager, rootNode, Vector3f.ZERO, 256, ColorRGBA.DarkGray);

        //
        Box box = new Box(1, 1, 1);
        //
        Material mat = MaterialUtils.makeMaterial(assetManager, "Common/MatDefs/Misc/Unshaded.j3md", ColorRGBA.Blue);
        Geometry geom = SpatialUtils.makeGeometry(vctrNodeSpatLoc, scale, box, mat, "box");
        vctrNode.attachChild(geom);
        vctrNode.setLocalTranslation(vctrNodeLoc);
        vctrSumm = vctrNodeLoc.add(vctrNodeSpatLoc);
        //
        Debug.showNodeAxes(assetManager, vctrNode, 4.0f);
        Debug.showVector3fArrow(assetManager, rootNode, vctrNodeLoc, ColorRGBA.Red, "vctrNodeLoc");
        Debug.showVector3fArrow(assetManager, vctrNode, vctrNodeSpatLoc, ColorRGBA.Green, "vctrNodeSpatLoc");
        Debug.showVector3fArrow(assetManager, rootNode, vctrSumm, ColorRGBA.Blue, "vctrSumm");
        //
        rootNode.attachChild(vctrNode);
    }

    @Override
    public void simpleUpdate(float tpf)
    {
        //n.move(tpf * 10, 0, 0);
    }

    @Override
    public void simpleRender(RenderManager rm)
    {
        //TODO: add render code
    }
}

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—

[source,java]
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package org.jmonkey.utils;

import com.jme3.asset.AssetManager;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;

/**
 * Example Vector Summ
 * @author Alex Cham aka Jcrypto
 */

public class MaterialUtils
{

    public MaterialUtils()
    {
    }


    //"Common/MatDefs/Misc/Unshaded.j3md"
    public static Material makeMaterial(AssetManager am, String name, ColorRGBA color)
    {
        Material mat = new Material(am, name);
        mat.setColor("Color", color);
        return mat;
    }
}

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—

[source,java]
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package org.jmonkey.utils;

import com.jme3.material.Material;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.Mesh;
import com.jme3.scene.Node;

/**
 * Example Vector Summ
 * @author Alex Cham aka Jcrypto
 */
public class SpatialUtils
{
    //
    public static Node makeNode(String name)
    {
        Node n = new Node(name);
        return n;
    }

//
    public static Geometry makeGeometry(Mesh mesh, Material mat, String name)
    {
        Geometry geom = new Geometry(name, mesh);
        geom.setMaterial(mat);
        return geom;
    }

    //
    public static Geometry makeGeometry(Vector3f loc, Vector3f scl, Mesh mesh, Material mat, String name)
    {
        Geometry geom = new Geometry(name, mesh);
        geom.setMaterial(mat);
        geom.setLocalTranslation(loc);
        geom.setLocalScale(scl);
        return geom;
    }
}

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—
Debug.java

[source,java]
----


package org.jmonkey.utils;

import com.jme3.animation.AnimControl;
import com.jme3.asset.AssetManager;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.Node;
import com.jme3.scene.debug.Arrow;
import com.jme3.scene.debug.Grid;
import com.jme3.scene.debug.SkeletonDebugger;
import com.jme3.scene.shape.Line;
import static org.jmonkey.utils.SpatialUtils.makeGeometry;

/**
 Example Vector Summ

 @author Alex Cham aka Jcrypto
 */
public class Debug
{

    public static void showNodeAxes(AssetManager am, Node n, float axisLen)
    {
        Vector3f v = new Vector3f(axisLen, 0, 0);
        Arrow a = new Arrow(v);
        Material mat = new Material(am, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Red);
        Geometry geom = new Geometry(n.getName() + "XAxis", a);
        geom.setMaterial(mat);
        n.attachChild(geom);


        //
        v = new Vector3f(0, axisLen, 0);
        a = new Arrow(v);
        mat = new Material(am, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Green);
        geom = new Geometry(n.getName() + "YAxis", a);
        geom.setMaterial(mat);
        n.attachChild(geom);


        //
        v = new Vector3f(0, 0, axisLen);
        a = new Arrow(v);
        mat = new Material(am, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Blue);
        geom = new Geometry(n.getName() + "ZAxis", a);
        geom.setMaterial(mat);
        n.attachChild(geom);
    }

    //
    public static void showVector3fArrow(AssetManager am, Node n, Vector3f v, ColorRGBA color, String name)
    {
        Arrow a = new Arrow(v);
        Material mat = MaterialUtils.makeMaterial(am, "Common/MatDefs/Misc/Unshaded.j3md", color);
        Geometry geom = makeGeometry(a, mat, name);
        n.attachChild(geom);
    }

    public static void showVector3fLine(AssetManager am, Node n, Vector3f v, ColorRGBA color, String name)
    {
        Line l = new Line(v.subtract(v), v);
        Material mat = MaterialUtils.makeMaterial(am, "Common/MatDefs/Misc/Unshaded.j3md", color);
        Geometry geom = makeGeometry(l, mat, name);
        n.attachChild(geom);
    }

//Skeleton Debugger
    public static void attachSkeleton(AssetManager am, Node player, AnimControl control)
    {
        SkeletonDebugger skeletonDebug = new SkeletonDebugger("skeleton", control.getSkeleton());
        Material mat2 = new Material(am, "Common/MatDefs/Misc/Unshaded.j3md");
        mat2.setColor("Color", ColorRGBA.Yellow);
        mat2.getAdditionalRenderState().setDepthTest(false);
        skeletonDebug.setMaterial(mat2);
        player.attachChild(skeletonDebug);
    }

    ///
    public static void attachWireFrameDebugGrid(AssetManager assetManager, Node n, Vector3f pos, Integer size, ColorRGBA color)
    {
        Geometry g = new Geometry("wireFrameDebugGrid", new Grid(size, size, 1.0f));//1WU
        Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.getAdditionalRenderState().setWireframe(true);
        mat.setColor("Color", color);
        g.setMaterial(mat);
        g.center().move(pos);
        n.attachChild(g);
    }
}

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