George,
Yes, approaching the problem from that angle would be a nightmare. The
only (reasonable performance) solution I can imagine would be to use a
single texture for the 50x50 grid and use texture coordinates to pick
out the right piece of your texture image to place at each grid.
Essentially the idea is to put all your various textures into a single
image and access them as if they were individual textures by using
(probably) hand generated texture coordinates. (Have fun getting your
artist to make that composite texture too!)
This approach yields a single Shape3D with a single appearance (with
texture) and thus should render reasonably. But it requires a lot of
upfront construction to set it up.
- John Wright
Starfire Research
George Vilches wrote:
>
> What if we were to extend this problem one step further, and say could we apply
> a different texture to each polygon face if we were to pick it? Does that still
> work? I would imagine that for most cases (for instance, building a terrain
> *grid* with textures), there would very likely be a reason that every grid
> square touching another would need a different texture. However, for even a
> small grid (50*50), 2500 Shape3Ds do not render nicely at all.
>
> >Date: Mon, 19 Jun 2000 12:26:36 -0400
> >From: "Dvorak, Daniel J." <[EMAIL PROTECTED]>
> >Subject: Re: many shape3d objects
> >MIME-Version: 1.0
> >Content-Transfer-Encoding: quoted-printable
> >X-MIME-Autoconverted: from 8bit to quoted-printable by itd.nrl.navy.mil id
> DAA14889
> >
> >So you can change the color of a polygon face by changing the color of the
> >vertices? Do you still need a reference to an appearance so the face will
> >be drawn? Did the memory requirement go down significantly when you put all
> >the polygons into one Shape3D?
> >Daniel
> >
> >-----Original Message-----
> >From: Bruno Sousa Caiado [mailto:[EMAIL PROTECTED]]
> >Sent: Monday, June 19, 2000 11:30 AM
> >To: [EMAIL PROTECTED]
> >Subject: Re: [JAVA3D] many shape3d objects
> >
> >
> >Hello,
> >I had a similar problem with my project and i solved it using the Indexed
> >geometry classes provided by j3d. With this classes you put as many polygons
> >as you want in one shape3D (check out the IndexedGeometryArray class in the
> >API)
> >
> >As far as changing the appearance of the individual polygons, you can change
> >their color if you�re able to know what are the vertices that belong to the
> >polygon in question. All you have to do is use an array to map the color
> >onto the vertices (as opposed to using the appearance to set the color...)
> >and then change the color at the specified indices of the array...
> >Hope it helps...
> >Good luck and good work...
> >
> >Bruno Caiado
> >
> >----- Original Message -----
> >From: Dvorak, Daniel J. <[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>
> >Sent: Monday, June 19, 2000 3:38 PM
> >Subject: [JAVA3D] many shape3d objects
> >
> >
> >> In my project, I need to draw about 30000 polygons, each individually
> >> pickable. When a polygon is picked, I change the color by changing the
> >> appearance reference. Currently I create a Shape3D for each polygon, and
> >> this requires about 160Mb of RAM. I think the huge memory requirement is
> >> due to the number of Shape3D objects. Is there a way to create all my
> >> geometry using one Shape3D and still have the ability to change appearance
> >> of individual polygons?
> >>
> >> Daniel
> >>
> >>
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>
> ***************************************************************
> * George Vilches *
> * Computer Scientist, Intelligent Systems Section *
> * Navy Center For Applied Research in Artificial Intelligence *
> * Naval Research Laboratory (NRL), Code 5510 *
> * 4555 Overlook Ave., S.W. *
> * Washington, DC 20375-5337 *
> * [EMAIL PROTECTED] *
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