Re: more questions

[slevy]

> I try to create several cameras, each one in
> a different location looking at a different geom.

You can only control (interactively, with the mouse) things in the
ordinary world.  "scene"s are a special feature; we didn't implement
interactive controls over them.

Still, you might be able to get the desired effect if you can construct
rotation/translation/etc. matrices yourself. Tell geomview something like: 

	(scene 1 { INST   transform : T   geom < cam-frame.quad})
	(scene 2 { INST   transform : T   geom < cloom.0.list})
etc.
Then you specify the positioning matrix, applied to all those geoms, by
(repeatedly) defining the symbol T with:

	(read transform { define T  ... sixteen numbers ... })

For example a 30-degree rotation in the XZ plane followed by a translation
of 2 in Z would be (I think)

	(read transform { define T
		.866  0  .5   0 

		0     1  0    0

		-.5   0  .866 0

		0     0  2    0
	    })

Note that T is completely respecified each time it's defined; you need to
supply the absolute matrix, not an incremental one from the previous matrix.

To specify a camera's initial position, you can use
	(window default { position ... })
before creating the camera.  "default" specifies stuff for future cameras.


You can specify colors on the faces when you construct the
geometry; see "man 5 oogl", e.g. CQUAD format, which specifies
a color per vertex, or OFF which can specify a color per face.
You can't use the interactive color picker to choose per-face colors,
though.