"SharkD" <nomail@nomail> wrote:
> "Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> > You are still having the same problem with your cones, or rather similar.  You
> > are now working from 0 to 180 degrees, with the angle being the angle from the
> > north pole.  The cone has a defined height of 2*SphereGrid_radius*y, but the
> > radius of the cone is 2*SphereGrid_radius*abs(tand(SphereGrid_value)).  When
> > angle=90, tan(90)=undefined, giving you a problematic cone, which happens to be
> > the equator gridline.  If you want to continue the way you have it, have an
> > additional #if statement for SphereGrid_value=90 which differences a box
> > instead.
> >
> > -tgq
>
> OK, that fixed it. Thank you! Also, is there a way I can use the #switch
> statement instead of branching #if and #else statements? I don't mind using
> #ifelse statements (which POV-Ray doesn't have), but I hate using branching
> where it's not necessary.

You could try:

#declare LATRANGE=select(90-SphereGrid_value,1,2,3);

#switch (LATRANGE)
  #case(1) //Do this for angle < 90
  #break
  #case(2) //Do this for angle = 90
  #break
  #case(3)  /Do this for angle > 90
  #break
#end


There may be other more elegant ways...
-tgq

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