[solved] Trouble with rotation

Pesegato · March 17, 2015, 2:49pm

I know, I know… see “scenegraph for dummies”… already done that, please bear with me

I’ve made a parent Node, attached a child Geometry to it and attached a CharacterControl to the parent Node.

Then I want to rotate the parent Node. The method getWorldRotation() shows that the parent Node is rotated, but on the screen I don’t see the child rotating…

Constructor:

github.com

QuietOne/MonkeyBrains/blob/60fdf1f0c84ff002cfc90d11491e658992bbcdc7/src/redmonkey/elements/monkey/RedMonkey.java#L42


CharacterControl control;
AnimChannel channel;
public AnimControl animControl;
TerrainQuad terrain;
public Node spatial=new Node();
public Spatial model;
Quaternion q = new Quaternion();
float speedFact;
GameLogicHook gameLogic;
public RedMonkey(float x, float y,float z, TerrainQuad terrain, Spatial model, GameLogicHook gameLogic, float yTranslation) {
    tags.add("Monkey");
    this.terrain=terrain;
    this.model=model;
    this.model.setLocalTranslation(0, yTranslation, 0);
    this.spatial.move(x,y,z);
    this.position=spatial.getLocalTranslation();
    this.spatial.attachChild(model);
    this.gameLogic=gameLogic;
}

Rotation:

github.com

QuietOne/MonkeyBrains/blob/60fdf1f0c84ff002cfc90d11491e658992bbcdc7/src/redmonkey/elements/monkey/RedMonkey.java#L73


public void setBehaviorTree(AssetManager assetManager, String tree) {
    BehaviorTreeParser<RedMonkey> parser = new BehaviorTreeParser<RedMonkey>(BehaviorTreeParser.DEBUG_NONE);
    behaviorTree = parser.parse((String) (assetManager.loadAsset(tree)), this);
}
public boolean notSleeping(String anim) {
    return !anim.equals(channel.getAnimationName());
}
public void move(Vector3f dir) {
    control.setWalkDirection(dir);
    Vector3f norM = terrain.getNormal(new Vector2f(spatial.getWorldTranslation().x, spatial.getWorldTranslation().z));
    norM = norM.cross(dir).cross(norM);
    q.lookAt(norM, Vector3f.UNIT_Y);
    spatial.setLocalRotation(q);
    System.out.println("Spatial rotation"+spatial.getWorldRotation());
}
public boolean lookingAround(ArrayList<String> tags) {
    for (RMItem sensedItem : getSense().scan()) {

Momoko_Fan · March 17, 2015, 3:27pm

When the Spatial is linked to a physics object, it cannot be transformed normally. You have to use the physics functions for those operations.

Pesegato · March 17, 2015, 3:38pm

Makes sense. Let’s do yet another intermediary node…

Darkchaos · March 17, 2015, 4:50pm

.setViewDirection should do the Trick

Pesegato · March 18, 2015, 7:58am

Well… more or less. With this code I get endless spinning:

Quaternion q;
q.lookAt(norM, Vector3f.UNIT_Y);
control.setViewDirection(q.mult(control.getViewDirection()));

How should I fix it?

Empire_Phoenix · March 18, 2015, 8:30am

A quaternion is a rotation, and you probablly apply it in every single frame? resulting in a spinning.

Pesegato · March 18, 2015, 8:34am

I know, I want to do the CharacterControl equivalent of this:

spatial.setLocalRotation(q);

Darkchaos · March 18, 2015, 8:44am

Don’t you already have an simple lookat point? I mean there has to be a reason for what you want to lookat.

Other than that, simply use x = sin Rotation around y axis (phi) and z = cos phi.

BUt i guess there is something built in like createLookAt.

Take a look at like the chasercams and stuff

Empire_Phoenix · March 18, 2015, 9:39am

ah ok

new Vector3f(0,0,1) → forward
q.lookAt(whereever)
q.multLoca(forward)
→ forward in q rotated space now
setViewDir(forward) → set the rotated forward dir