Re: Lines

Hi, Jon

I have tried the "set-bitmap" stuff ,but unfornately
the speed still tremendously slows down when I make
the spheres visible and "set-bitmap to 0". You said
the real fix is use breve 2.1. But is it a released
source code or just the every day snapshot? Currently
all my work is done in breve 1.9 and I have made
changes to the source code in order to display my
anmation on that volumetric display. So there will be
a lot of work to do if I want to use the new version
of breve 2.0. I have bumped into a lot of problems
when I tried to build breve1.9 in Mingw. I am
wondering if there is any other libraries I should
include if I want to build breve 2.0 based on my
settings in Mingw to build 1.9? And when do you think
the breve 2.1 source code wil be available?

Thank you very much!

Best
Naiqi

--- jon klein <[email protected]> wrote:

> 
> On Jan 3, 2005, at 4:47 PM, Naiqi Weng wrote:
> 
> > Hi, jon
> >
> > I am not sure whether you still remember my
> project.
> > :) Just give you some warm up:  I am drawing some
> > breve animation on a special device. I drew a
> "string"
> > which consists of several spheres connecting to
> each
> > other by the "add-line" method. The problem now is
> I
> > don't want to display the sphere whereas I want to
> > keep the lines. (You may suggest to make the
> sphere as
> > small as possible, but that's not the key point.
> The
> > problem lies when there are too many spheres
> displayed
> > on the device, no matter how small they are, the
> > animation will slow down tremendously due to the
> > limitation of the device). I found that when  you
> make
> > an object invisible by "make-invisible" method,
> the
> > lines between this object and other objects are
> not
> > drawn. Is that possible for me to revise some
> source
> > code to make the lines still be drawn no matter
> the
> > object is invisible or not?
> 
> This is an issue I've addressed in breve 2.1 -- even
> if the object is invisible, it should still be
> possible
> to display the object line.
> 
> A very quick fix for 2.0: make the object a small
> sphere,
> but instead of displaying it as a sphere (which
> draws
> several polygons and can indeed be quite slow when
> many
> are displayed), set it to a bitmap, which is drawn
> with
> a single polygon.  You can just use the number
> 0, which is the built-in "floor" tile bitmap:
> 	myAgent set-bitmap to 0.
> 
> If you want a real fix, the 2.1 source is pretty
> stable
> at this point, so you might want to grab the latest
> snapshot and work from there.  In addition to huge
> numbers
> of bug fixes and new features, the 2.1 source is a
> lot
> cleaner than the 2.0 source and so should be a lot
> easier
> to work with otherwise.
> 
> > Another question is:I am  confused by the
> collision
> > detection in Breve, since in my
> animation,sometimes
> > the different parts of an object just penetrate
> each
> > other. Is it up to the user to handle the
> collision or
> > Breve can automatically handle this problem?
> 
> Are you running a physical simulation, or a
> non-physical
> simulation?  In a physical simulation, the objects
> should
> 
> If you're using physical simulation with MultiBodies
> (as it sounds like perhaps you are...) then
> collision
> detection between the different link objects must be
> specially enabled, using the MultiBody method
> enable-self-collisions.
> 
> - jon klein
> 
> _______________________________________________
> breve mailing list
> [email protected]
> http://lists.spiderland.org/mailman/listinfo/breve
> 


		
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