Hi, I have a strange problem with glwidget and Vertex Buffer Object. Here is my simple code:

obj struct (a part of):

Qt Code: 
  1. float *vertexy;
  2. GLuint vertex_buf;
  3. float *normalne;
  4. GLuint norm_buf;
  5. float *textury;
  6. GLuint tex_buf;
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t_obj.rozmiar is a size of 3d object (no. of polys)

Loading VBO :

Qt Code: 
  1. glEnableClientState(GL_VERTEX_ARRAY);
  2.  glGenBuffersARB(1, &t_obj.vertex_buf);
  3. glBindBufferARB(GL_ARRAY_BUFFER_ARB, t_obj.vertex_buf);
  4. glBufferDataARB(GL_ARRAY_BUFFER_ARB, (t_obj.rozmiar*3*3)*sizeof(float),t_obj.vertexy, GL_STATIC_DRAW_ARB); 
  5.  
  6. glEnableClientState(GL_NORMAL_ARRAY);
  7. glGenBuffersARB(1, &t_obj.norm_buf);
  8. glBindBufferARB(GL_ARRAY_BUFFER, t_obj.norm_buf);
  9. glBufferDataARB(GL_ARRAY_BUFFER_ARB, (t_obj.rozmiar*3*3)*sizeof(float),t_obj.normalne, GL_STATIC_DRAW_ARB); 
  10.  
  11. glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  12. glGenBuffersARB(1, &t_obj.tex_buf);
  13. glBindBufferARB(GL_ARRAY_BUFFER, t_obj.tex_buf);
  14. glBufferDataARB(GL_ARRAY_BUFFER, (t_obj.rozmiar*3*3)*sizeof(float), t_obj.textury, GL_STATIC_DRAW_ARB);
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and drawing :

Qt Code: 
  1. glEnableClientState(GL_VERTEX_ARRAY); 
  2.  
  3. glBindBufferARB( GL_ARRAY_BUFFER_ARB, obj.vertex_buf ); 
  4. glVertexPointer( 3, GL_FLOAT, 0, (char *) NULL );  
  5.  
  6. glEnableClientState(GL_NORMAL_ARRAY); 
  7. glBindBufferARB(GL_ARRAY_BUFFER, obj.norm_buf);
  8. glNormalPointer(GL_FLOAT,0, (char *) NULL );  
  9.  
  10. glEnableClientState(GL_TEXTURE_COORD_ARRAY); 
  11. glBindBufferARB(GL_ARRAY_BUFFER, obj.tex_buf);
  12. glTexCoordPointer(3, GL_FLOAT, 0, (char *) NULL );
  13.  
  14. glDrawArrays(GL_TRIANGLES, 0, obj.rozmiar*3);
  15.  
  16. glDisableClientState( GL_VERTEX_ARRAY );
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This code works perfect in "normal" opengl application (without QT). With QT and glwidget i have a clear screen. What am I Doing Wrong?

Rufjan