   CG shader and Sprite - Point Size
  Hello,i got a vertex shader, so i need to calculate the Point Size manually.So i thought it would be something like this:pointsize = clamp ( d * sqrt( 1 / (a + b * d + c * d * d)))so i took glstate.point.size and glstate.point.attenuation to calculate this.I found a site where it says, that point.size, holts :- point size- minimum size- maximum size- fade sizeand point.attenuation hold:-  a-  b-  c-  1but CG (nvidia) saves only one float for each. not a float4.So does someone know how to calculate Point-Size with CG (nvidia) ?thanks   