Android Open Source - min3d Example Animating Vertices

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License

The source code is released under:

MIT License

Java Source Code

package com.min3d;
//from   w  w w .  ja  va 2s  . co m
import android.graphics.Bitmap;

import com.min3d.lib.Shared;
import com.min3d.lib.Utils;
import com.min3d.lib.core.Object3dContainer;
import com.min3d.lib.core.RendererActivity;
import com.min3d.lib.objectPrimitives.Rectangle;
import com.min3d.lib.vos.Color4;
import com.min3d.lib.vos.Number3d;

/**
 * Example of accessing and changing vertex data.
 * Specifically, we're animating the position of one vertex.
 * 
 * The same could be done for vertex colors, normal, or texture coordinates.
 * 
 * @author Lee
 */
public class ExampleAnimatingVertices extends RendererActivity
{
  Object3dContainer _plane;

  Number3d _defaultPosUL;
  Number3d _defaultPosLR;
  
  int _count;

  
  public void initScene() 
  {
    // Set size of the plane using the same aspect ratio of source image
    Bitmap b = Utils.makeBitmapFromResourceId(this, R.drawable.deadmickey);
    float w = 2f;
    float h = w * (float)b.getHeight() / (float)b.getWidth();; 
    
    _plane = new Rectangle(w, h, 1,1, new Color4());
    _plane.doubleSidedEnabled(true); // ... so that the back of the plane is visible
    _plane.normalsEnabled(false);
    scene.addChild(_plane);

    Shared.textureManager().addTextureId(b, "mickey", false);
    _plane.textures().addById("mickey");
    
    b.recycle();

    //  Get the coordinates of the point at vertex number 0 (the upper-left vertex of the plane)
    //  and put its values in a Number3d. Same for lower-right vertex.
    _defaultPosUL = _plane.points().getAsNumber3d(0);
    _defaultPosLR = _plane.points().getAsNumber3d(3);

    _count = 0;
  }

  @Override 
  public void updateScene() 
  {
    // Change the values for the positions of the upperleft and lower right vertices
    
    float offset = (25f - (float)(_count % 25)) * 0.02f; // ... sure wish I knew of a nice Java tweener class
    offset *= offset;

    _plane.points().set(0, _defaultPosUL.x - offset, _defaultPosUL.y + offset, _defaultPosUL.z);

    offset = (25f - (float)((_count +13) % 25)) * 0.02f;
    offset *= offset;
    
    _plane.points().set(3, _defaultPosLR.x + offset, _defaultPosLR.y - offset, _defaultPosLR.z);
    
    _plane.rotation().y++;
    
    _count++;
  }
}

Java Source Code List

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