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emitter driven by angle on edges.

emitter driven by angle on edges.

2005-05-12       - By Robert Moodie

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Great minds think alike, Raf    ;-)



 -- -- Original Message -- --
 From: Raffaele "ThE_JacO" Fragapane
 To: XSI@(protected)
 Sent: Thursday, May 12, 2005 2:08 PM
 Subject: RE: emitter driven by angle on edges.


 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


 -- ---- ---- ---- ---- ---- ---- ---
 ~Raffaele Fragapane
 ~Lead "I'm sure we can make it work"
 ~Peerless Camera Company
 -- ---- ---- ---- ---- ---- ---- ---

 -- --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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<DIV><FONT face=Tahoma size=2>Great minds think alike, Raf&nbsp;&nbsp;&nbsp;
;-)</FONT></DIV>
<DIV><FONT face=Tahoma size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Tahoma size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Tahoma size=2></FONT>&nbsp;</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT:
#000000 2px solid; MARGIN-RIGHT: 0px">
 <DIV style="FONT: 10pt arial">-- -- Original Message -- -- </DIV>
 <DIV
 style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
 <A title=jaco@(protected) href="mailto:jaco@(protected)">Raffaele "ThE_JacO"
 Fragapane</A> </DIV>
 <DIV style="FONT: 10pt arial"><B>To:</B> <A title=XSI@(protected)
 href="mailto:XSI@(protected)">XSI@(protected)</A> </DIV>
 <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, May 12, 2005 2:08
PM</DIV>
 <DIV style="FONT: 10pt arial"><B>Subject:</B> RE: emitter driven by angle on
 edges.</DIV>
 <DIV><BR></DIV>Reinhard Claus has an addon called curvature map that will
work
 on these<BR>premises and generate maps for you.<BR><BR>The same maps can then
 be used to drive the emission.<BR><BR>Haven't tryied it myself but I can't
see
 why it shouldn't work.<BR><BR>This is the site:<BR><A
 href="http://www.claus-figuren.de/">http://www.claus-figuren.de/</A><BR><BR
>this
 is the page for that particular plug:<BR><A
 href="http://www.claus-figuren.de/addons/curvaturemap.php">http://www.claus
-figuren.de/addons/curvaturemap.php</A><BR><BR><BR>-- ---- ---- ---- ---- ------
-- ----<BR>~Raffaele
 Fragapane<BR>~Lead "I'm sure we can make it work"<BR>~Peerless Camera
 Company<BR>-- ---- ---- ---- ---- ---- ---- ---<BR><BR>-- --Original
 Message-- --<BR>From: <A
 href="mailto:owner-xsi@(protected)">owner-xsi@(protected)</A>
 [mailto:owner-xsi@(protected)] On Behalf Of<BR>Jeff McFall<BR>Sent:
 Thursday, May 12, 2005 6:53 PM<BR>To: <A
 href="mailto:XSI@(protected)">XSI@(protected)</A><BR>Subject: RE: emitter
 driven by angle on edges.<BR><BR>Ive considered this in the past but never
had
 a chance to try and implement<BR>it.<BR><BR>My idea would be to generate an
 image sequence from a top down ortho view on<BR>the surface of your water
 using an incidence shader to define your "sharp"<BR>angles on the waves.&nbsp
;
 One could then use this sequence as a weight map for<BR>driving your particle
 emission.<BR><BR>Potential problems with this approach would be:<BR>-&nbsp; a
 relatively limited resolution of the weight map, given a<BR>potentially large
 surface of water.<BR>-&nbsp; It's a two step approach and would have all of
 the complications<BR>that come from that.<BR>-&nbsp; You would have to turn
 your entire water surface into an emitter<BR>and that could quickly become a
 performance problem for generating the<BR>particles due to its relatively
 large size.<BR><BR>I would really like to see how you are able to make this
 work whatever your<BR>solution
 is.<BR><BR>Jeff<BR><BR><BR><BR>&nbsp;<BR><BR>-- --Original
 Message-- --<BR>From: <A
 href="mailto:owner-xsi@(protected)">owner-xsi@(protected)</A>
 [mailto:owner-xsi@(protected)] On Behalf Of<BR>Pingo<BR>Sent: Thursday, May
 12, 2005 1:29 PM<BR>To: <A
 href="mailto:XSI@(protected)">XSI@(protected)</A><BR>Subject: emitter
 driven by angle on edges.<BR><BR>ok, don't quite know how to ask this
 question, so here's an example...<BR><BR>say I got a grid that deforms...
like
 an ocean surface. so there's waves<BR>with ridges and slopes.<BR><BR>Now I
 want to emit particles if the angle on an edge is larger than... say<BR>180
 degrees - so where ever the waves are sharp there's... foam.<BR><BR>I'm kinda
 looking for something like what the dirt shader does, only<BR>inverted, but
it
 doesn't quite do what I want it to do... not even sure I<BR>can use it to
 drive an emission...<BR><BR>I'm also assuming I need something that can drive
 a weight map... So can I<BR>get XSI to calculate the angle on edges (or
 between polygon normals...<BR>something) and make the
 map?<BR><BR>anyone?<BR><BR>cheers all!<BR><BR>pingo<BR>---<BR>Unsubscribe?
 Mail <A href="mailto:Majordomo@(protected)">Majordomo@(protected)</A>
with
 the following text in body:<BR>unsubscribe xsi<BR><BR>---<BR>Unsubscribe?
Mail
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.859
 / Virus Database: 585 - Release Date:
 14-Feb-05 (See http://Feb-05.ora-code.com)<BR>&nbsp;<BR><BR>---<BR>Outgoing mail is certified Virus
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