problem loading Float Buffer correctly

[PinHead]

Hi,
  I'm having a problem with loading the x,y,z vertices the problem is, is that I get the vertices loaded which resemble a Cube but I keep getting a vertice in the middle of the cube that shouldnt be their ?

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private float[]pointsf = {  1.000000f, -1.000000f, -1.000000f,                     1.000000f, -1.000000f, 1.000000f,                   -1.000000f, -1.000000f, 1.000000f,                                  -1.000000f, -1.000000f, -1.000000f,                                    1.000000f, 1.000000f,  -0.999999f,                                    0.999999f, 1.000000f,  1.000001f,                                  -1.000000f, 1.000000f,  1.000000f,                                  -1.000000f, 1.000000f, -1.000000f }; private FloatBuffer rectVertices; @Override    public void display(GLAutoDrawable gld )    {       // TODO Auto-generated method stub      GL2 gl = gld.getGL().getGL2();             gl.glClear( GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );             gl.glMatrixMode( GL2.GL_MODELVIEW );             gl.glLoadIdentity();             gl.glTranslatef( 0.0f, 0.0f, -5.0f );             gl.glRotatef( 0, 1.0f, 0.0f, 0.0f );       gl.glRotatef( 0, 0.0f, 1.0f, 0.0f );             rectVertices = GLBuffers.newDirectFloatBuffer( pointsf.length );             rectVertices.put( pointsf );       rectVertices.rewind();                     gl.glVertexPointer( 3, GL2.GL_FLOAT, 0, rectVertices );       gl.glEnableClientState( GL2.GL_VERTEX_ARRAY );       gl.glNormal3f( 0,0,1 );       gl.glDrawArrays( GL2.GL_POINTS, 0, pointsf.length );  // Generate the polygon using 4 vertices.      gl.glDisableClientState( GL2.GL_VERTEX_ARRAY );          } public void init(GLAutoDrawable gld )    {       // TODO Auto-generated method stub      GL2 gl = gld.getGL().getGL2();       glu = new GLU();       gl.glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );             gl.glEnable( GL2.GL_DEPTH_TEST );             gl.glMatrixMode( GL2.GL_PROJECTION );             gl.glLoadIdentity();             glu.gluPerspective( 45.0, 500.0 / 500.0, 1.0, 500.0 );             gl.glPointSize( 5.0f );            }

I would of tried to show this in a image but cant figure out how to load the image?

[ img ]
src = "C:\\Documents and Settings\Administrator\My Documents\My Pictures\pointArray.bmp"/>
[/img]

[lhkbob]

Double posting is not your friend

But there should be an attach option when writing a post that should let you put images up.  They might have to be png or jpg's

[PinHead]

Hi,
  I figured out the problem the cube requires 8 vertice where I was putting in the length of the array this does work but interestingly puts a vertice in the middle of the cube, and also interestingly if you don't create any  x, y or z coordinates it will create a vertice in the middle without any coordinates as long as you have a number in the vertice in the glDrawArrays.

1	gl.glDrawArrays( GL2.GL_POINTS, 0, 1 );

Wrong

1	gl.glDrawArrays( GL2.GL_POINTS, 0, pointsf.length );

Right

1	gl.glDrawArrays( GL2.GL_POINTS, 0, 8 );

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[lhkbob]

OpenGL is a state machine, including its current vertex position.  By default this is at (0, 0, 0) so if you just call glDrawArrays(GL_POINTS, 0, 1) you'll render a point at that position.

Instead of using pointsf.length, you want to divide by 3 since it's asking for the number of vertices, not array elements to use.

With the change to glDrawArrays, did your problem go away?