Precipitation - Weird TexCoords

Hello. I'm looking at the precipitation mission object and am able to get them working 'OK'. On closer inspection, I noticed that all images are rendered with goofy texture coordinates. The end effect is that the texture is squeezed into a corner. Poking around the code I found a routine that was pre-generating the texture coordinates for the billoboard quads. For the life of me I couldn't quite grasp what it was doing.

Anyways, I've modified the renderPrecip() routine as follow:

//               glTexCoord2f(coordX, coordY);
               glTexCoord2f(0.f, 0.f); //EFM
               glVertex3f(point[0].x, point[0].y, point[0].z);
               glTexCoord2f(0.f, 1.f);//EFM
//               glTexCoord2f(coordX, coordY + 0.25);
               glVertex3f(point[1].x, point[1].y, point[1].z);
               glTexCoord2f(1.f, 1.f);//EFM
//               glTexCoord2f(coordX + 0.25, coordY + 0.25);
               glVertex3f(point[2].x, point[2].y, point[2].z);
               glTexCoord2f(1.f, 0.f);//EFM
//               glTexCoord2f(coordX + 0.25, coordY);
               glVertex3f(point[3].x, point[3].y, point[3].z);

What I'd like to know is, "Does anyone have a clue what is going on with those original texture coords, and if so how can we manipulate them, or at least get them to render nicely?

Thanks!

PS - Here is the routine I was talking about:

void Precipitation::setupTexCoords()
{
   S32 x, y, numTimes = NUM_TEXTURES / 4;
   
   for(y = 0; y < numTimes ; ++y)  
      for(x = 0; x < numTimes ; ++x)  
         mTexCoord[y * numTimes + x].set(x * 0.25f, y * 0.25f);
}

PPS Here is screen shot showing the before (left) and after (right) images: