Geomview on NeXT

[wmg at sofya.umd.edu (William M. Goldman)]

Here are some error messages and other flaky experiences I've been having
with geomview on my NeXT:

(1) I've been working through the manual (6.2, Example 1:Simple
External Module) I clicked on ``[1] Example 1'' in the main panel,
when this error occurred:

/usr/people/wmg-> geomview
sh: 195 Hangup
Reading MESH from "[1]Example 1": bad element (21,5) of (24,24):
> END OF FILE
Segmentation fault

No core file was created.

(2) Also several times I would kill a geomview process from 
the shell and this would cause the whole system to crash.

(3) At one point I left the machine running for a while during which
geomview was rotating the dodec/tetra example and then (while I was away)
things started to go beserk:

/usr/people/wmg-> DPS client library error: Invalid port, DPSContext 0, data 23
DPS client library error: Invalid port, DPSContext 0, data 23
DPS client library error: Invalid port, DPSContext 0, data 23
DPS client library error: Invalid port, DPSContext 0, data 23
DPS client library error: Invalid port, DPSContext 0, data 23
DPS client library error: Invalid port, DPSContext 0, data 23
DPS client library error: Invalid port, DPSContext 0, data 23
DPS client library error: Invalid port, DPSContext 0, data 23
RenderMan client: error in flush of stream
DPS client library error: Invalid port, DPSContext 0, data 23

(4) Here are some experiences with Geomview/Mathematica on my NeXT:

I wrote the following file to create two OOGL files in Mma:

(*****************************************************************************
 				cubic.m 
******************************************************************************)
<<OOGL.m

fp[x_,y_] :=  (x*y + Sqrt[4 + (x^2-4)*(y^2-4)])/2; 
fm[x_,y_] :=  (x*y - Sqrt[4 + (x^2-4)*(y^2-4)])/2; 

WriteOOGL["topcubic.oogl", Plot3D[fp[x,y],{x,-5,5},{y,-5,5}]]
WriteOOGL["botcubic.oogl", Plot3D[fm[x,y],{x,-5,5},{y,-5,5}]]
(*****************************************************************************)

(Because the radicand is sometimes negative, there are some problems
in creating the mesh. But I am going to forge ahead anyway...)

The files ``topcubic.oogl'' and ``botcubic.oogl'' are both created.
But Geomview can't read them! Here's what happened:

/usr/people/wmg-> geomview botcubic.oogl topcubic.oogl &
[1] 482
/usr/people/wmg-> Reading MESH from "/usr/people/wmg/botcubic.oogl": bad element (5,0) of (15,15):
> END OF FILE
Couldn't read LIST in "/usr/people/wmg/botcubic.oogl": error reading embedded object:
> ... MESH 
-----^
> 
> 15 15
>  -5.000000  -5.000000  1.952488445135506 
Can't load /usr/people/wmg/botcubic.oogl
Reading MESH from "/usr/people/wmg/topcubic.oogl": bad element (5,0) of (15,15):
> END OF FILE
Couldn't read LIST in "/usr/people/wmg/topcubic.oogl": error reading embedded object:
> ... MESH 
-----^
> 
> 15 15
>  -5.000000  -5.000000  23.04751155486449 
Can't load /usr/people/wmg/topcubic.oogl