Yet more noob questions

Troubleshooting General Help
1

greeting everyone !!



Before I present my problems I would like to say you guys have done a GREAT job with jMonkey.

I'm very excited about it, and I have been reading / trying / coding some things out with the API.



I created a model in 3dsmax and a basic level, that looks like an arena - a rounded area where the players should fight - with some obstacles, walls, pillars, block, etc.



I have created a basic game, based on the tutorials, imported the models into it and created a camera that simulate a 1st person view. The camera follows the model and turns with it, as we move it around the level.



So far, so good. My biggest problem is when I try to check for collisions with the walls or objects on the level (the ground isn't a problem, cause its flat, and I keep the players a little above it all the time).



Looks like as soon as the game begins it start to fire the collision events, cause the geometry i imported from 3dsmax is too complex and the boundbox surrounds it all… ans my player being inside it… :frowning:



question: is there a way I could check the collision against each mesh of the imported object? I have created 3 Nodes: one for the ground, one for the circle walls and one for the obstacles… Only the simple obstacles seems to works as intended…



Thanks,



brancha.

2

Ok, guess I found a way to get the collisions between the meshes and not the boundboxes. I get a message when my model collide with the complexes meshes I imported from .3ds files.



...
private Node nodeWalls;
private Node player1;
private TriangleCollisionResults results;
...

private void buildWalls(){
...
    nodeWalls = loadModel("arenaWalls.3ds");
    nodeWalls.updateCollisionTree();
...
}

private void buildPlayer() {
...
    model = loadModel("player.3ds");
    player1.updateCollisionTree();
...
}

and the method updateCollisions() is in the main update loop:

private void updateCollisions() {
    results.clear();
    Vector3f lastValidLoc = player1.getLocalTranslation();
      
    player1.findCollisions(nodeWalls, results);
      
    if(results.getNumber() > 0){
        for(int i = 0; i < results.getNumber();i++){
            CollisionData data  = results.getCollisionData(i);
            if(data.getTargetMesh().hasCollision(data.getSourceMesh(),true)){
                player1.setLocalTranslation(lastValidLoc);
   System.out.println("Collison between "+data.getSourceMesh().getName()+" - "+data.getTargetMesh().getName());
            }
        }
    }
}



I'm getting the message when my player collides with a wall or any object of the imported mesh.
Now the problem is my player is not going back to its last valid position... :(
Any ideas why??
Would appreciate a little input,

Thanks,

brancha.
3

This:


    Vector3f lastValidLoc = player1.getLocalTranslation();


stores a reference to the vector that represents the location of your player. That vector is altered afterwards!
You should do

Vector3f lastValidLoc = new Vector3f();


and update it each time the location is valied with

lastValidLoc.set(player1.getLocalTranslation());



This way you copy the values.
To move your player back to the last valid location execute

player1.getLocalTranslation().set( lastValidLocation );


(again copy values not reference)

And: Welcome to jME :)
4

Geez I'm so dumb… of course.



Thanks irrisor.