OBJ Loader and bounding sphere

[Marco Bambini <marco at sqlabs dot net>]

I have written an OBJ Loader in REALbasic:
http://www.sqlabs.net/blog/2006/03/realbasic-obj-loader.html

Using vertex values is easy to calculate the radius of the bounding  
sphere (using the abs value), but what is the best way to compute its  
center?
It is safe to assume that the center is always 0,0,0 if I compute the  
radius in this simple way:
  if (abs(mMaxVertex.x) > Radius) then Radius = abs(mMaxVertex.x)
  if (abs(mMaxVertex.y) > Radius) then Radius = abs(mMaxVertex.y)
  if (abs(mMaxVertex.z) > Radius) then Radius = abs(mMaxVertex.z)
  if (abs(mMinVertex.x) > Radius) then Radius = abs(mMinVertex.x)
  if (abs(mMinVertex.y) > Radius) then Radius = abs(mMinVertex.y)
  if (abs(mMinVertex.z) > Radius) then Radius = abs(mMinVertex.z)

mMaxVertex and mMinVertex are computed at load time.

Thanks a lot,
---
Marco Bambini
http://www.sqlabs.net
http://www.sqlabs.net/blog/



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