Re: quesa/Development/Source/Renderers/Interactive IRGeometry.c,1.46,1.47

[Roger H. <rog...@mi...>]

James' change of Q3Vector3D_Length to Q3FastVector3D_Length before
comparing with 1.0 (with a tolerance) made me wonder why we need to do
the square root. Why not call Q3FastVector2D_LengthSquared instead?
The square of something close to one must be close to one.

( 1 + delta ) ^2 = 1 + 2 * delta + delta^2. As we are using the 
floating point
epsilon, delta^2 is insignificant, so we just need to compare with a new
constant of 2 * kQ3RealZero.

By the way, I think the name kQ3RealZero is a bit misleading. Real zero 
is
zero, kQ3RealZero is just a small number. How about kQ3AlmostZero?

Roger.