Re: line segment/triangle intersection in 3D

[Joe Raffanti <joeraffanti at accessbee dot com>]

Thanks for all the feedback, everyone.
I think this is what you were referring to in Renegades:

Function PlaneIntersection(planeNormal As Vector3D, planeD As Double, 
p0 As Vector3D, p1 As Vector3D) As Vector3D
   // Find the intersection of the line from p0 to p1 with the given plane.
  
   // See Lengyel p. 85.
  
   Dim t As Double
   Dim V As Vector3D
  
   V = p1.Minus(p0)
   t = -(planeNormal.dot(p0) + planeD) / (planeNormal.Dot(V))
   return p0.Plus(V.Times(t))
  
End Function
This looks like the right thing, but what does planeD refer to? ...I 
assume it is plane Depth or something like that, but then what do I 
measure the depth from? How would I set up the plane?
thanks,
Joe Raffanti

> At 4:14 PM -0700 8/18/05, Joe Raffanti wrote:
>
> > Has anyone written a RB line segment / triangle intersection detection test?
> I think there's one in Renegades, or in its precursor, the FPS demo 
> described in RB Developer issue 1.3.
> > If so, could I use it?
> Sure, help yourself.  If that doesn't do what you need, then do a 
> search for "Paul Bourke Geometry" -- Paul is an astronomer in 
> Australia who has a ton of amazingly useful tutorials for this sort 
> of thing.
> Best,
> - Joe
>
> --
> Joe Strout                          REAL Software, Inc.
>
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