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Program aborts on particle effect

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Very strange problem here. I have a particle system which works fine in a very mysterious circumstance. I have two classes, one for rain, the other for a particle effect. If I do this: Draw Rain Draw particles It works fine. But when I take the rain drawing routine out, the program aborts. The rain drawing routine:
void C_Rain::Draw_Rain()
  g_pd3dDevice -> SetRenderState( D3DRS_LIGHTING, FALSE );
  g_pd3dDevice -> SetRenderState( D3DRS_SHADEMODE, D3DSHADE_FLAT );
  // setup to draw

  g_pd3dDevice -> SetStreamSource( 0, Rain_VB, sizeof( S_Rain ) );
  g_pd3dDevice -> SetVertexShader( D3DFVF_Rain_Flag );

  g_pd3dDevice -> DrawPrimitive( D3DPT_LINELIST, 0, NUM_DROPS );
}// end Draw_Rain

_________________________________________________ The firefly ( particle system drawing routine):
void C_FireFly::Draw()
  // setup and draw the particle poles

  g_pd3dDevice -> SetRenderState( D3DRS_ZWRITEENABLE, FALSE );
  g_pd3dDevice -> SetRenderState( D3DRS_POINTSPRITEENABLE, TRUE );
  g_pd3dDevice -> SetRenderState( D3DRS_POINTSCALEENABLE,  TRUE );
  g_pd3dDevice -> SetRenderState( D3DRS_POINTSIZE, FtoDW(0.0025f) );
  g_pd3dDevice -> SetVertexShader( D3DFVF_XYZDIFFUSE );
  g_pd3dDevice -> SetStreamSource( 0, FireFly_VB, sizeof( S_XYZDIFFUSE ) );
  g_pd3dDevice -> DrawPrimitive( D3DPT_POINTLIST, 0, 1000 );
  g_pd3dDevice -> SetRenderState( D3DRS_POINTSCALEENABLE,  FALSE );
  g_pd3dDevice -> SetRenderState( D3DRS_POINTSPRITEENABLE, FALSE );
  g_pd3dDevice -> SetRenderState( D3DRS_ZWRITEENABLE, TRUE );

}// end Draw

Note remming out the DrawPrimitive function is all I have to do to cause a program abort. Leaving it in, it draws the rain and particles just fine. [EDIT] Edited for clarity. [/EDIT] Guy, I regress: WW, TTC, THTV. [edited by - Arion on October 17, 2002 3:52:02 PM]

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An interesting developement.

I find that if I call the rain drawing routine only once in the render loop, the program runs fine and does not abort. The particles are drawn just fine.

I wonder if there is something wrong with the Direct X files.
Lots of ! beside many file names in the Direct X diagnostic utility. Doesn''t look too good.

Guy, I regress: WW, TTC, THTV.

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My money is on a memory bug.

The problem has already occured, try excluding/changing code/classes executed before the particle and rain classes.


Carpe Diem

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No such luck I''m afraid.
Thanks for the suggestion DeltaVee.

I did all the above and the program still aborts unelss the DrawPrimitive function with the rain is still there.

Guy, I regress: WW, TTC, THTV.

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Definitely corrupting memory in a major way.

When I get the error, all my other projects won''t run. I two different compilers Visual C++ and Dev C++.

It takes a reboot to sort things out.
I''m going to have to stop playing with the dumb thing.
Many reboots == real pain in the you know what

I also re-installed Direct X 8.0 just in case there was something wrong with that.

Guy, I regress: WW, TTC, THTV.

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