[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Gnu3dkit-discuss] Shapes and geometry
From: |
Brent Gulanowski |
Subject: |
Re: [Gnu3dkit-discuss] Shapes and geometry |
Date: |
Mon, 8 Jul 2002 23:27:02 -0400 |
On Sunday, July 7, 2002, at 06:58 AM, Philippe C.D. Robert wrote:
Hi,
working on the new shape/geometry code I wonder how important it is to
have shapes which manage multiple geometry objects, what do you think?
FYI I turned G3DGeometry into a class from which all other geometries
inherit. This will make it much easier to have different kinds of
geometries, such as tri strips, vertex arrays or whatever...
Well, that is where I would have first thought to handle LOD and animation
geometries, but you've already covered that with the related groups. Since
the texture is part of the shape, you'd need the texture to be multiple
too, no? Assuming the geometries where different-looking objects as
opposed to just differently ordered vertices.
What is the mapping of the scene graph classes to the things that a
user/player would see in a world made with 3DKit? If there's a stegosaurus
wandering around eating plants, does that correspond to a group object
with a bunch of shapes, each of which is a frame of animation? And if one
object has LOD *and* animation shape sets, which one would be the child of
the other? I'm thinking animation would be the parent, giving a
timedSwitch group having children which are LODSwitch groups full of
shapes representing the same frame of the animation.
But that points out an inefficiency which your idea would remove: if there
is a different shape attached to every LOD version of a shape, they
probably all use the same transforms and everything, meaning wasted space
and the need to synchronize the static arrays. I would see groups as being
most useful for dynamic groupings of objects, based on spatial proximity
or temporary life spans, or for complex objects whose components animated
independently of each other.
Brent
--
Inkubator: creating free, open source Mac games.
http://inkubator.idevgames.com - homepage
http://www.sourceforge.net/project/inkubator - project page
http://64.246.17.165/forum/forumdisplay.php?s=&forumid=17 - discussion
forums