Particle : Rate controled by distance ? 2005-05-21 - By Guillaume Laforge
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After some tests I think I didn't need particles to do this. Some simple
grids animated along the path should be easier to control...but I'm hitting
an other wall :-(
I can't find the way to constrain a grid to the camera like the particle
billboard facing the camera.
Help !
Cheers,
Guillaume Laforge
CG artist
www.vol2nuit.fr <http://www.vol2nuit.fr>
2005/5/20, guillaume laforge <guillaume.laforge.3d@(protected)>:
>
> Fantastic !
> Thanks for the tips :-) It works very well with the emitter animated
> along a circle ( Particle clock look :-) )
> Will be harder to use it in my scene (camera animation and interaction
> with characters...) but I'll give it a try.
> Thanks again Eric.
>
> 2005/5/20, Eric Lampi <ericlampi@(protected)>:
> >
> > Emission is tied to frame rate, so you would get
> > better results if you changed it to an easily divided
> > number. For example, if you take small emitter say
> > the default sphere emitter scalled to .001, make the
> > emission rate 10, velocity 0, set the playback to 100
> > fps, key the emitter to move from -10 x to 10 x linear
> > keys. The resulting placement about 95% perfect,
> > there's a little variation but it's probably due to
> > scale. That will help as well, always make sure you
> > err on the side of a large scale as opposed to a small
> > one since when particles really get moving sometimes
> > you'll see big gaps in the emission.
> >
> > So in your case if you can scale your animation so
> > that it will match at 100fps you should be able to do
> > it more easily than, if you're stuck at 25, 30, 29.97
> > (which is the worst of this sort of thing) since you
> > to have your rate set to a factor of the FPS value.
> > 10 of course is the easiest to work out.
> >
> > E
> >
> > --- guillaume laforge < guillaume.laforge.3d@(protected)>
> > wrote:
> > > Hi,
> > > I've got an emitter animated along a curve. If I
> > > use the rate based on
> > > time, the distribution of particles along the curve
> > > isn't uniform because
> > > the Path %age isn't linear.
> > > I need a uniform space between each particles.
> > > Is it possible to emite one particle each n units
> > > of a curve ?
> > > Thanks,
> > > Guillaume Laforge
> > > CG artist
> > > www.vol2nuit.fr <http://www.vol2nuit.fr/> <http://www.vol2nuit.fr>
> > >
> >
> > Freelance 3-D Animator, F/X Artist, Particle Man
> > ---
> > Unsubscribe? Mail Majordomo@(protected) with the following text in
> > body:
> > unsubscribe xsi
> >
>
>
<div>After some tests I think I didn't need particles to do this.
Some simple grids animated along the path should be easier to control...but I'm
hitting an other wall :-(</div>
<div>I can't find the way to constrain a grid to the camera like the particle
billboard facing the camera.</div>
<div> </div>
<div>Help !</div>
<div> </div>
<div>Cheers,</div>
<div> </div>
<div>Guillaume Laforge</div>
<div>CG artist</div>
<div><a href="http://www.vol2nuit.fr">www.vol2nuit.fr</a></div>
<div><br> </div>
<div><span class="gmail_quote">2005/5/20, guillaume laforge <<a href="mailto
:guillaume.laforge.3d@(protected)">guillaume.laforge.3d@(protected)</a>>:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0
.8ex; BORDER-LEFT: #ccc 1px solid">
<div>Fantastic !</div>
<div> </div>
<div>Thanks for the tips :-) It works very well with the emitter animated along
a circle ( Particle clock look :-) )</div>
<div>Will be harder to use it in my scene (camera animation and interaction
with characters...) but I'll give it a try.</div>
<div> </div>
<div>Thanks again Eric.</div>
<div><br> </div>
<div><span class="gmail_quote">2005/5/20, Eric Lampi <<a onclick="return top
.js.OpenExtLink(window,event,this)" href="mailto:ericlampi@(protected)" target="
_blank">ericlampi@(protected)</a>>:</span>
<div><span class="e" id="q_103fbe8431a7acab_1">
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0
.8ex; BORDER-LEFT: #ccc 1px solid">Emission is tied to frame rate, so you would
get<br>better results if you changed it to an easily divided<br>
number. For example, if you take small emitter say<br>the default
sphere emitter scalled to .001, make the<br>emission rate 10, velocity 0, set
the playback to 100<br>fps, key the emitter to move from -10 x to 10 x linear
<br>keys. The resulting placement about 95% perfect,<br>there's a
little variation but it's probably due to<br>scale. That
will help as well, always make sure you<br>err on the side of a large scale as
opposed to a small
<br>one since when particles really get moving sometimes<br>you'll see big gaps
in the emission.<br><br>So in your case if you can scale your animation so<br
>that it will match at 100fps you should be able to do<br>it more easily than,
if you're stuck at 25, 30,
29.97<br>(which is the worst of this sort of thing) since you<br>to have your
rate set to a factor of the FPS value.<br>10 of course is the easiest to work
out.<br><br>E<br><br>--- guillaume laforge <<a onclick="return top.js
.OpenExtLink(window,event,this)" href="mailto:guillaume.laforge.3d@(protected)"
target="_blank">
guillaume.laforge.3d@(protected)</a>><br>wrote:<br>> Hi,<br>>
I've got an emitter animated along a curve. If I<br>> use the rate
based on<br>> time, the distribution of particles along the curve<br>>
isn't uniform because
<br>> the Path %age isn't linear.<br>> I need a uniform space between
each particles.<br>> Is it possible to emite one particle each n
units<br>> of a curve ?<br>> Thanks,<br>>
Guillaume Laforge<br>
> CG artist<br>> <a onclick="return top.js.OpenExtLink(window,event,this)
" href="http://www.vol2nuit.fr/" target="_blank">www.vol2nuit.fr</a> <<a
onclick="return top.js.OpenExtLink(window,event,this)" href="http://www
.vol2nuit.fr/" target="_blank">
http://www.vol2nuit.fr</a>><br>><br><br>Freelance 3-D Animator, F/X
Artist, Particle Man<br>---<br>Unsubscribe? Mail <a onclick="return top.js
.OpenExtLink(window,event,this)" href="mailto:Majordomo@(protected)" target="
_blank">
Majordomo@(protected)</a> with the following text in body:<br>unsubscribe xsi
<br></blockquote></span></div></div><br></blockquote></div><br>
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