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In article <1992Aug20.122428.1193@ciit85.ciit.nrc.ca>, Dick Jackson <Dick_Jackson@qm.ibd.nrc.ca> writes:
|> Newsgroups: comp.graphics.explorer
|> Subject: HELP: Displace 1D Lat -> 2D?
|> From: Dick Jackson <Dick_Jackson@qm.ibd.nrc.ca>
  ...
|> 
|> I have a 1D Lattice of values (intensity values of a spectrum), which
|> I want to see as a curve in space.  The Help for DisplaceLat would
|> make you think that it would have the same kind of effect as above,
|> pushing the line into the 2nd dimension.
|> 

There is a module called Mixer that will allow you to 
constuct the coordinate portion of a lattice from the data/coordinate
of an incoming lattice. You would do something like:

coord 0 -> coord 0		! connect the incoming 1st coord array to X coords
data 0 -> coord 1		! connect the incoming 1st data array to Y coords
none -> coord 2			! don;t want any Z coords
data -> data			! connect all the incoming data to the output data

This module was on the SIGGRAPH Explorer CD for all attendees of the users group.
If these aren't on the ftp sites yet, I would suspect they will be soon.

|> 
|> Dick Jackson
|> Institute for Biodiagnostics            National Research Council Canada
|> Winnipeg, Manitoba                                 jackson@qm.ibd.nrc.ca
|>                       Any opinions: Mine alone!

-- 

Gary Griffin			I just hope I'm still dreamin'
gary@sgi.com			'cause if this is for real
				I'm gonna get very depressed
Think WORLDWIDE		
						Howard T Duck

In article <1992Aug20.122428.1193@ciit85.ciit.nrc.ca>, Dick Jackson <Dick_Jackson@qm.ibd.nrc.ca> writes:
|> Hello, seasoned Explorers:
|> 
|> I may be missing something obvious, but here's what I'm trying to do:
|> 
|> First, the rationale:
|> It seems easy enough to turn a 2D Lattice of values into a 3D surface,
|> by putting the same Lattice into the Function and Displacement of a
|> DisplaceLat module.  (fine example: korea.z)
|> 
|> I have a 1D Lattice of values (intensity values of a spectrum), which
|> I want to see as a curve in space.  The Help for DisplaceLat would
|> make you think that it would have the same kind of effect as above,
|> pushing the line into the 2nd dimension.
|> 
|> To try this, I put two GenLats with 2D outputs into DisplaceLat ->
|> LatToGeom -> Render, and I got some great 3D surfaces (it helps to
|> put the Function lattice straight to Render too!).  But changing
|> the GenLats to 1D (with DataVec Length=1) gives me a straight line!
|> (DataVec Length of 2 can push the points NON-orthogonally into one
|> plane, but I want orthogonal displacement by scalar values!)
|> 
|> Help!  And thanks in advance!
|> 

You are right.  This is one of the things I hope to fix soon.
DisplaceLat tries hard to one of two functions, depending on its input
data.  As a result it (me, really) gets confused, doesn't do everything
right (as in your example), or keeps you from doing something useful.
DisplaceLat should be replaced with 2 modules:  HeightFieldLat (change coords
from N-D to N+M-D -- what you want), and OffsetLat (displace each point
non-orthogonally).

I hope to write those modules soon, but I can't make any promises about
when I acutally can.  I can send you the source to DisplaceLat with
a pointer about where I think you can patch the problem.  If so, reply
by email.

-- 

Robert Skinner
robert@sgi.com

	"The sendmail configuration file is one of those files that
	looks like someone beat their head on the keyboard. After
	working with it... I can see why!"

				-- Harry Skelton (harry@usrgrp)