Noob problem with TriMesh

Troubleshooting graphics
1

Hi there,



I’m new to jMe (so noob inside).

While I was training to jMe, I want to make a sphere from 6 TriMesh. The sphere is good but it seems there is a problem with the (Z ?) rendering.







I use part of the tutorial but with a StandardGame. Jars are the one that you can download from this website (I don’t want to mess up with the cvs too  :P)



My main is :

public static void main(String argv[])
  {
    StandardGame game = new StandardGame("Bonbon's Civ");
   
    try
    {
      GameSettingsPanel.prompt(game.getSettings());
    }
    catch(Exception ex) { ex.printStackTrace(); System.exit(0); }
    game.start();
   
    DebugGameState gameState = new DebugGameState();   // Create our game state
       
    create(gameState,"Name1",VAL_I,VAL_J,VAL_PLUS);
    create(gameState,"Name2",VAL_I,VAL_J,VAL_MINUS);
    create(gameState,"Name3",VAL_I,VAL_PLUS,VAL_J);
    create(gameState,"Name4",VAL_I,VAL_MINUS,VAL_J);
    create(gameState,"Name5",VAL_MINUS,VAL_I,VAL_J);
    create(gameState,"Name6",VAL_PLUS,VAL_I,VAL_J);
   
   /* ZBufferState buf = game.getDisplay().getRenderer().createZBufferState();
    buf.setFunction(ZBufferState.CF_LEQUAL);
    buf.setWritable(true);
    gameState.getRootNode().setRenderState(buf);
   
    gameState.getRootNode().updateRenderState();*/
   
 //   gameState.getRootNode().setLightCombineMode(LightState.OFF);
   
    GameStateManager.getInstance().attachChild(gameState);   // Attach it to the GameStateManager
    gameState.setActive(true);   // Activate it
  }



Mesh are created there :

protected static void create(DebugGameState gameState,String name,int X,int Y,int Z)
  {
    java.nio.FloatBuffer vertices = BufferUtils.createFloatBuffer((NB+1)*(NB+1)*3);
        java.nio.FloatBuffer normal = BufferUtils.createFloatBuffer((NB+1)*(NB+1)*3);
        java.nio.FloatBuffer color = BufferUtils.createFloatBuffer((NB+1)*(NB+1)*4);
        java.nio.FloatBuffer texture = BufferUtils.createFloatBuffer((NB+1)*(NB+1)*2);
        java.nio.IntBuffer indices = BufferUtils.createIntBuffer(NB*NB*2*3);
        
        for(int x=0;x<=NB;x++)
        {
          for(int y=0;y<=NB;y++)
          {
            float xx = 0;
           
            if (X == VAL_I) { xx = (x*diam)/NB-rayon; }
            else if (X == VAL_J) { xx = (y*diam)/NB-rayon; }
            else if (X == VAL_PLUS) { xx = rayon; }
            else if (X == VAL_MINUS) { xx = -rayon; }
           
            float yy = 0;
            if (Y == VAL_I) { yy = (x*diam)/NB-rayon; }
            else if (Y == VAL_J) { yy = (y*diam)/NB-rayon; }
            else if (Y == VAL_PLUS) { yy = rayon; }
            else if (Y == VAL_MINUS) { yy = -rayon; }
           
            float zz = 0;
            if (Z == VAL_I) { zz = (x*diam)/NB-rayon; }
            else if (Z == VAL_J) { zz = (y*diam)/NB-rayon; }
            else if (Z == VAL_PLUS) { zz = rayon; }
            else if (Z == VAL_MINUS) { zz = -rayon; }
           
            float ln = (float)Math.sqrt(xx*xx+yy*yy+zz*zz);
           
            xx /= ln;
            yy /= ln;
            zz /= ln;
           
            normal.put(xx);
            normal.put(yy);
            normal.put(zz);
           
            xx *= 5.0;
            yy *= 5.0;
            zz *= 5.0;
           
            vertices.put(xx);
            vertices.put(yy);
            vertices.put(zz);
           
            color.put( red(xx,yy,zz) );
            color.put( green(xx,yy,zz)  );
            color.put( blue(xx,yy,zz)  );
            color.put( 1.0f  );
           
            texture.put(0.0f);
            texture.put(0.0f);
          }
        }
       
       
        for(int x=0;x<NB;x++)
        {
          for(int y=0;y<NB;y++)
          {
            int nb1 = x+y*(NB+1);
            int nb2 = (x+1)+y*(NB+1);
            int nb3 = x+(y+1)*(NB+1);
           
            indices.put(nb1);
            indices.put(nb2);
            indices.put(nb3);
           
            nb1 = (x+1)+(y+1)*(NB+1);
           
            indices.put(nb2);
            indices.put(nb1);
            indices.put(nb3);
          }
        }
       
       // TriMesh sphere = new TriMesh(name,vertices,normal,color,texture,indices);
       
        TriMesh sphere = new TriMesh(name,vertices,normal,color,null,indices);
         
        BoundingBox bb = new BoundingBox();
        sphere.setModelBound(bb);
        sphere.updateModelBound();
       
        sphere.updateRenderState();
       
        gameState.getRootNode().attachChild(sphere);   // Attach the box to rootNode in DebugGameState
  }



Since it seems to be a ZBuffer problem, I try to use a ZBufferState. But when I do a "gameState.getRootNode().updateRenderState();" my sphere is all grey (and it doesn't solve my problem).

By the way, when I use "GameSettingsPanel.prompt(game.getSettings());", I get a ugly dialogue. How do I get the same as in BasicGame ?
2

When you do "gameState.getRootNode().updateRenderState();" it makes your sphere gray because of the light

Try doing


lightState.detachAll()

3

Well without ligth and with ZBufferRenderer, it word "well"…

I use "sphere.setLightCombineMode(LightState.OFF);" though. I'm getting use to renderer state slowly.



What about the setting dialog box ?

4

You can make a new GameSettings object from the code in AbstractGame.getAttributes() and then initialize StandardGame like this



        StandardGame game = new StandardGame("Game", GameType.GRAPHICAL, settings);

5

:smiley: I manage to make it out.



Thanks  :wink: