🚀 go-pugleaf

In article <1993Jan11.174115.11398@julian.uwo.ca>, lferjo@gfx.engga.uwo.ca (Lisa Ferjo) writes:
|> I would appreciate any information on the module VectorGen.  This is how I
|> think it works.
|> 
|> I have 3d volumetric data of heart cusp.  The data looks like this.
|> Resolution 20 11 3
|> x coord   ycoord   z coord  function
|> 3.0E+00   10.0E+00 4.0E+00   3.0E+00
|> .
|> .
|> .
|> When I use vectorgen in my map I get vectors at my coordinate points.  I
|> think that explorer takes the function value as the length of the vector
|> and uses an angle of 90 degrees as a default value.  This is how I think
|> it works.  
|> 
|> I am wondering how to get different angles for the vectors.  I would think
|> you would make your data look like this
|> 
|> Resolution 20 11 3
|> xcoord    ycoord   zcoord  function    vecx     vecy    vecz
|> 3.0E+00   10.0E+00 4.0E+00 10.0E+00    3.0E+00  4.0E+00 10.0E+00 
|> .
|> .
|> .
|> The function value would correspond to the different colours you wanted. 
|> VECx, VEcy, Vecz would be used to calculate the angle and the length of
|> the vector.
|> 
|> 
|> If this is the way explorer does it, how does it differentiate between the
|> function value used for the colour map and the values used to calculate
|> the vector.
|> 
-- 

VectorGen always uses Red/White vectors. It uses the three function values
to give direction. If you provide 1 function value, VectorGen assumes it is
a delta-X direction. Two values gives delta-(X,Y).

Dave

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David Foulser					foulser@sgi.com 
MS 1L-545
Silicon Graphics, Inc   			415/390-5338 
2011 N. Shoreline Blvd. 			415/390-6056 FAX
Mountain View, CA 94039-7311