[SOLVED] Attach Lemur Labels To Joints

adi.barda · May 13, 2020, 1:27pm

Hello Guys,
I’m trying to attach Lemur labels to joints / bones . Well not really attach but just place a label with the joint name near the joint.
Problem is that the labels are spread horizontally instead of vertically (I will add a video demonstrating it soon)
Here is the code:

    private void showHideJoints(AppModel model, final boolean showJoints) {
        String retval = model.getJointsList();
        if(retval!=null && retval.length()>0) {
            String joints[] = retval.split(",");
            for(int i=0;i<joints.length;++i) {
                String jointName = joints[i];
                Vector3f pos = model.getJointPosition(jointName);
                Label l = new Label(jointName);

                l.setFontSize(0.5f);
                l.setPreferredSize(new Vector3f(20f,1f,0));
                l.setLocalTranslation(pos);
                model.model.attachChild(l);

            }
        }
    }

And here is the helper method for getting the joint position:

 public Vector3f getJointPosition(String jointName) {

        if(this.resource.isJ3O()) {

            Skeleton sk = findSkeleton(model);
            if(sk!=null) {

                Bone b = sk.getBone(jointName);
                if(b!=null) {
                    return b.getLocalPosition();
                }
            }

        } else {

            Spatial sp = model.getChild(0);
            SkinningControl skinningControl = sp.getControl(SkinningControl.class);
            if(skinningControl!=null) {
                Joint j = skinningControl.getArmature().getJoint(jointName);
                if(j!=null) {
                    return j.getLocalTranslation();
                }
            }

        }

        return null;

    }

Here is the video:

What do you think?
Thanks!

Ali_RS · May 13, 2020, 1:48pm

Try to attach labels to joint attachment node

github.com

jMonkeyEngine/jmonkeyengine/blob/f808187142b79fa6c82c38b58ba09b71c90aa2bb/jme3-core/src/main/java/com/jme3/anim/SkinningControl.java#L385


/**
 * Access the attachments node of the named bone. If the bone doesn't
 * already have an attachments node, create one and attach it to the scene
 * graph. Models and effects attached to the attachments node will follow
 * the bone's motions.
 *
 * @param jointName the name of the joint
 * @return the attachments node of the joint
 */
public Node getAttachmentsNode(String jointName) {
    Joint b = armature.getJoint(jointName);
    if (b == null) {
        throw new IllegalArgumentException("Given bone name does not exist "
                + "in the armature.");
    }
    updateTargetsAndMaterials(spatial);
    int boneIndex = armature.getJointIndex(b);
    Node n = b.getAttachmentsNode(boneIndex, targets);
    /*

adi.barda · May 13, 2020, 1:50pm

I’m working both with Joints & Bones (when loading J3O files)
what is the equivalent of attachment nodes in Bones?

Ali_RS · May 13, 2020, 1:52pm

github.com

jMonkeyEngine/jmonkeyengine/blob/f808187142b79fa6c82c38b58ba09b71c90aa2bb/jme3-core/src/main/java/com/jme3/animation/SkeletonControl.java#L381


     
/**
 * Access the attachments node of the named bone. If the bone doesn't
 * already have an attachments node, create one and attach it to the scene
 * graph. Models and effects attached to the attachments node will follow
 * the bone's motions.
 *
 * @param boneName the name of the bone
 * @return the attachments node of the bone
 */
public Node getAttachmentsNode(String boneName) {
    Bone b = skeleton.getBone(boneName);
    if (b == null) {
        throw new IllegalArgumentException("Given bone name does not exist "
                + "in the skeleton.");
    }
    updateTargetsAndMaterials(spatial);
    int boneIndex = skeleton.getBoneIndex(b);
    Node n = b.getAttachmentsNode(boneIndex, targets);
    /*

adi.barda · May 13, 2020, 1:53pm

Thanks a lot! checking…

adi.barda · May 13, 2020, 2:32pm

Working great. I would like however to try putting billboard labels instead of “regular” ones. Do you happen to know if Lemur support billboard mode labels?

pspeed · May 13, 2020, 2:34pm

Add a billboard control… should work like any other spatial.

Ali_RS · May 13, 2020, 2:36pm

github.com

jMonkeyEngine/jmonkeyengine/blob/f808187142b79fa6c82c38b58ba09b71c90aa2bb/jme3-core/src/main/java/com/jme3/scene/control/BillboardControl.java#L49


import com.jme3.math.Matrix3f;
import com.jme3.math.Quaternion;
import com.jme3.math.Vector3f;
import com.jme3.renderer.Camera;
import com.jme3.renderer.RenderManager;
import com.jme3.renderer.ViewPort;
import com.jme3.scene.Node;
import com.jme3.scene.Spatial;
import java.io.IOException;
public class BillboardControl extends AbstractControl {
    private Matrix3f orient;
    private Vector3f look;
    private Vector3f left;
    private Alignment alignment;
    /**
     * Determines how the billboard is aligned to the screen/camera.
     */
    public enum Alignment {

github.com

jMonkeyEngine/jmonkeyengine/blob/f808187142b79fa6c82c38b58ba09b71c90aa2bb/jme3-examples/src/main/java/jme3test/model/shape/TestBillboard.java#L49


import com.jme3.scene.Geometry;
import com.jme3.scene.Node;
import com.jme3.scene.control.BillboardControl;
import com.jme3.scene.shape.Box;
import com.jme3.scene.shape.Quad;
/**
 *
 * @author Kirill Vainer
 */
public class TestBillboard extends SimpleApplication {
    @Override
    public void simpleInitApp() {
        flyCam.setMoveSpeed(10);
        Quad q = new Quad(2, 2);
        Geometry g = new Geometry("Quad", q);
        Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Blue);
        g.setMaterial(mat);

adi.barda · May 13, 2020, 3:31pm

Fantastic support guys! Thank you so much.
Everything now works as expected and I can easily teach my students about using joints in 3D games.

Ali_RS · May 13, 2020, 3:48pm

Glad it is solved.

By the way, there is another one here, created by nehon, which also does bone picking, I guess.

github.com

Nehon/bvhretarget/blob/6f7bede10b5730dedc552a6c6d93b575f223fb0c/src/custom/SkeletonDebugger.java#L56


import java.nio.FloatBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
 * The class that creates a mesh to display how bones behave. If it is supplied
 * with the bones' lengths it will show exactly how the bones look like on the
 * scene. If not then only connections between each bone heads will be shown.
 */
public class SkeletonDebugger extends BatchNode {
    /**
     * The lines of the bones or the wires between their heads.
     */
    private SkeletonBone bones;
    
    private Skeleton skeleton;
    /**
     * The dotted lines between a bone's tail and the had of its children. Not
     * available if the length data was not provided.

tlf30 · May 14, 2020, 1:41pm

Oh that is cool. I can see that being useful for debugging in almost any large game application too.

adi.barda · May 14, 2020, 1:51pm

Yes. And now I can also fine - tune the collision detection between animated models