RE: Making holes in pfEarthSky.
Jeff Brickley (jbrickley++at++lmwsmr.lesc.lockheed.com)
Tue, 20 May 1997 10:04:30 -0700
Try modelling a box, 5 sided (top open), then layer a series of squares
through the box all the way to the top. At the appropriate moment, each of
the squares can be "hidden" and the hole will be dug. As far as the
EarthSky Model, SGI may have a better way, but I believe that the "earth" is
put in at the origin 0,0,0 as a plane extending to the horizon, build a
"platform" over the "earth" colored the same and I doubt anyone would know
that you were digging above the EarthSky "earth" and on your own ground.
I've never tried this technique, but you could, alternately, place clipping
planes through the "earth" to create a hole, but I don't know how Performer
models the EarthSky, so I don't know if that would work.
----------
> From: Simon Dimaio
> To: SGI Performer Forum
> Subject: Making holes in pfEarthSky.
> Date: Tuesday, May 20, 1997 4:02AM
>
> Hi
>
> I am currently working on a simulation of an excavator (used for digging),
> using Performer 2.0 (IRIX 5.3). The excavator has been modelled and is
> working well, however animating the digging has proved to be little
> tricky. I am able to produce a reasonably convincing hole in the ground,
> but am not able to integrate this with the ground created by using a
> pfEarthSky. An ideal solution would be the ability to make parts of the
> "Earth" transparent, revealing the hole underneith. Is there a way of
> doing this?
>
> Another option would be to use a fine mesh instead of the "Earth",
> allowing for deformation during digging. This option would require a large
> number of mesh points and would be rather inefficient.
>
> I would appreciate any suggestions or solutions.
>
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