Hello,
I hope someone can provide me some helps or advice...

I would like to display particles object on a marker, but having problem of
using OpenGL code to disable the display alpha channel of (blend) the .tga
texture image file.

I had tried the following snippet OpenGL code in the artoolkit draw() function:

{
    argDrawMode3D();
    argDraw3dCamera( 0, 0 );
    glClearDepth( 1.0 );
    glClear(GL_DEPTH_BUFFER_BIT);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);

    /* load the camera transformation matrix */
    argConvGlpara(trans, gl_para);
    glMatrixMode(GL_MODELVIEW);
    glLoadMatrixd( gl_para );

  // Set the general polygon properties
  glEnable(GL_TEXTURE_2D);
  glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
  glAlphaFunc(GL_GREATER,0.1f);
  glEnable(GL_BLEND);
  glBindTexture(GL_TEXTURE_2D, Texture2);
  glBegin(GL_QUADS);
      glTexCoord2f(0.0f,1.0f); glVertex3i(  0,-32,-100);
      glTexCoord2f(0.0f,0.0f); glVertex3i(  0, 96,-100);
      glTexCoord2f(1.0f,0.0f); glVertex3i(256, 96,-100);
      glTexCoord2f(1.0f,1.0f); glVertex3i(256,-32,-100);
   glEnd();
   glDisable(GL_BLEND);
   glDisable( GL_LIGHTING );
   glDisable( GL_DEPTH_TEST );
}

Have I done anything wrong in the artoolkit ?  I appreciate if you can let me
know which part of my code is not right as the above OpenGL code works fine in
pure OpenGL program.


-- 
Thanks
Kevin Tan
Manchester Materials Science Centre
University of Manchester





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