A few questions

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Tagore D. Smith (tdsmith++at++escher.cs.umass.edu)
Thu, 22 Jan 1998 14:39:16 -0500 (EST)

   Hi, I was wondering if anyone could give me some advice and possibly
point me toward supplemental information. I have a few questions:

   #1 The libpfui is sparsely documented. Is there some additional
information posted anywhere? I gather that it is a library that contains
classes useful for vehicle motion simulation based on user input. The
application I'm writing does not have to simulate the physics of any real
vehicle; it is only necessary to be able to easily fly through a terrain
database. I have already implemented a viewer like this in Inventor, so I
have a good idea of how to do it. But I'm wondering if there are some
significant advantages to using libpfui. I'm still using Performer 2.1; is
the libpfui fully documented in 2.2?

   #2 Is there any further information on the pfsTerrain class? I've read
the man pages, and I find them a bit difficult to fully understand. If a
more complete description of how to use pfTerrain, in particular on the
relationship between each LOD and the LODs that bracket it, I would love
to hear about it. Also, are there now more members of the ASD?

   #3 Is there any more documentation on clipmapping? In particular, how
does clipmapping work on a texture that is being applied to a pfTerrain?
Can you even do this?

   #4 I'm used to programming in Inventor, and have only very recently
migrated to Performer. In Inventor you can use a badly sized texture. It
seems that in Performer your texture must be siized as a power of two.
When mapping texture to a terrain we have an aerial photograph that should
not be distorted. Should I just pad out the file to size it correctly and
then use texture coordinates to just map the original image onto the
terrain? Or is there an easier/better way?

   Sorry to go on at such length. Any help would be greatly appreciated.

                                                      Thanks
                                                      Tagore Smith

    

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