Path: chuka.playstation.co.uk!news
From: "Alex Herbert" <alex@herbs.dabsol.co.uk>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: Rotating a texture
Date: Thu, 10 Jun 1999 15:18:02 +0100
Organization: PlayStation Net Yaroze (SCEE)
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Miles Buzzing wrote in message <01beb309$bb80a380$0a3ddec2@sonia>...
>I'm trying to create a spinning wheel effect on a 3d object and in common
>with most low polygon count wheels it looks more like a 'nut' when set in
>motion! In order to stop my vehicle resembling something Fred Flintstone
>would drive I want to rotate my wheel texture rather than the object
>itself, any ideas!
>
>Thanks
>
>-- Miles

Hi Miles,

Yeah, just move the u,v components of the wheel TMD primitives.  If you've
loaded your TMD from a file, then you will probably need to write some sort
of search routine to find the wheel prims within the model.  I'd suggest
putting your  wheel-hub textures in a different TPage from your other
textures to make this searching simpler.  The memory loaction of these prims
won't change, so the search only needs to be executed once at startup.

Having said this though, it would probably be easier to load your model
without wheels, and create a wheels TMD in code.

Or, if you don't want to mess directly with TMD data, you could animate the
texture by overwriting the texture in VRAM with different images each frame.
By doing this, you'd be able to use just one model containing both the car
and the wheels, and save on the number of calls to GsSortObject4().  The
down side of this is that all models which use this texture would be
animated in-sync.

Hope this helps,


Herbs