Problems with Sprite3D?

Engines, Libraries and Tools Xith3D Forums
#1

Hello,

i want to write a sprite3D class, wich has the basic features of moving.

But i have several Problems which i can t solve on my own ::slight_smile:

Here is my code:


/*
 * Created on 05.05.2004
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package de.TWOmas.xith.sprite;

import java.text.DecimalFormat;

import javax.vecmath.Point3d;
import javax.vecmath.Tuple3f;
import javax.vecmath.Vector3f;

import com.xith3d.scenegraph.Switch;
import com.xith3d.scenegraph.Transform3D;
import com.xith3d.scenegraph.TransformGroup;

/**
 * @author Besitzer
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
public class Sprite3D {
      
      private Vector3f posVec = new Vector3f(0,0,0);
      private Vector3f directionVec;
      private Vector3f strafeVec;
      
      
      // Y is pointing up
      private Vector3f upVec = new Vector3f(0,1,0);
      
      
      /** Speed of the Sprite */
      private float spriteSpeed = 10;
      
      private TransformGroup transformGroup;
            
      private Transform3D transform = new Transform3D();
      private Transform3D tmpTransform = new Transform3D();
      
      /**
       * 
       * @param transformGroup
       * @param direction
       */
      public Sprite3D(TransformGroup transformGroup, Vector3f direction) {
            this.transformGroup = transformGroup;
            transformGroup.getTransform(tmpTransform);
            tmpTransform.get(posVec);
            directionVec = direction;
      }
      
      public void move(Vector3f move){
            transformGroup.getTransform(transform);
            tmpTransform.setIdentity();
            tmpTransform.setTranslation(move);
            tmpTransform.scaleTranslation(spriteSpeed);
            transform.mul(tmpTransform);
                        
            transformGroup.setTransform(transform);
            
            
      }
      
      public void rotXYZ (float x, float y, float z) {
            transformGroup.getTransform(transform);
            tmpTransform.setIdentity();
            tmpTransform.rotXYZ(x,y,z);
            //tmpTransform.scaleTranslation(spriteSpeed);
            transform.mul(tmpTransform);
                        
            transformGroup.setTransform(transform);            
      }
}

I don t know, wether this methods work corectly, so plz comment, if u find any trouble.

Here are my problems:
Must i submit the direction of the sprite in the constructor? I think yes. How should the Class know how the sprite is aligned, right?

How do i update my Strafe Vec after rotation?
I need them to rot along strafe and direction axis,
because my sprites should move in terrain.

Thanks for helping…