 | | | emitter driven by angle on edges. | emitter driven by angle on edges. 2005-05-12 - By Raffaele "ThE_JacO" Fragapane
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Reinhard Claus has an addon called curvature map that will work on these
premises and generate maps for you.
The same maps can then be used to drive the emission.
Haven't tryied it myself but I can't see why it shouldn't work.
This is the site:
http://www.claus-figuren.de/
this is the page for that particular plug:
http://www.claus-figuren.de/addons/curvaturemap.php
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~Raffaele Fragapane
~Lead "I'm sure we can make it work"
~Peerless Camera Company
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-- --Original Message-- --
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf Of
Jeff McFall
Sent: Thursday, May 12, 2005 6:53 PM
To: XSI@(protected)
Subject: RE: emitter driven by angle on edges.
Ive considered this in the past but never had a chance to try and implement
it.
My idea would be to generate an image sequence from a top down ortho view on
the surface of your water using an incidence shader to define your "sharp"
angles on the waves. One could then use this sequence as a weight map for
driving your particle emission.
Potential problems with this approach would be:
- a relatively limited resolution of the weight map, given a
potentially large surface of water.
- It's a two step approach and would have all of the complications
that come from that.
- You would have to turn your entire water surface into an emitter
and that could quickly become a performance problem for generating the
particles due to its relatively large size.
I would really like to see how you are able to make this work whatever your
solution is.
Jeff
-- --Original Message-- --
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf Of
Pingo
Sent: Thursday, May 12, 2005 1:29 PM
To: XSI@(protected)
Subject: emitter driven by angle on edges.
ok, don't quite know how to ask this question, so here's an example...
say I got a grid that deforms... like an ocean surface. so there's waves
with ridges and slopes.
Now I want to emit particles if the angle on an edge is larger than... say
180 degrees - so where ever the waves are sharp there's... foam.
I'm kinda looking for something like what the dirt shader does, only
inverted, but it doesn't quite do what I want it to do... not even sure I
can use it to drive an emission...
I'm also assuming I need something that can drive a weight map... So can I
get XSI to calculate the angle on edges (or between polygon normals...
something) and make the map?
anyone?
cheers all!
pingo
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