[Qt-interest] opengl rendering mesh elements contour problem

[Enrico Ros]

Hello Sujian,
  you'll have better results by posting this to an OpenGL forum / mailing 
list. This is more specific to Qt.

However:
 - if you're running inside a QGraphicsView, make sure you're using 
beginNativePainting / endNativePainting
 - check your code to see that the array doesn't point to any uninitialized 
elements, or to go beyond the actual data set
 - I hope the z-buffer is enabled, so you're not referring to back elements 
drawn over front elements

My 2 cents,
Enrico

On Monday 01 February 2010 10:51:42 Sujan Dasmahapatra wrote:
> Dear Friends
> I am creating a set quad elements in opengl QT....assigning each point a
> distinct color and I am creating these elements in GL_FILL mode so I am
> getting a contour with different colors for different points. These colors
> are distributed smoothly over all the element. But in someportions I can
> see a thin black lines black circles are coming.My background color is
> black.The mesh is circular..I am not able to find the reason why these
> black lines or patches are appearing that affecting the overall looks of
> my contour.
> 
> Please help me someone in sorting out this.Any suggestions would be highly
> appreaciated. Thanks
> 
> Please see the code below.
> //////////////////////////////////////////////////////
>     GLuint newlist = glGenLists(1);
>     glNewList(newlist, GL_COMPILE);
>     glEnableClientState(GL_COLOR_ARRAY);
>     glEnableClientState(GL_VERTEX_ARRAY);
>     glColorPointer(3,GL_FLOAT,0,colorPtr);
>     glVertexPointer(2, GL_FLOAT, 0, mesh_geom2.vertices);
>     glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
>     glNewList(newlist, GL_COMPILE);
>     glDrawElements(GL_QUADS, ptsInBlock*ptsInBlock*blocks*4,
> GL_UNSIGNED_INT, indices);
>     glEndList();
>     glDisableClientState(GL_COLOR_ARRAY);
>     glDisableClientState(GL_VERTEX_ARRAY);
> //////////////////////////////////////////////////////////////
 
 
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