 | | | Cloth sim flag ripples? | Cloth sim flag ripples? 2004-04-01 - By kim aldis
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I've never had satisfactory results using cloth alone but using cloth with a
combination of other deforms works well. Last time I used a fairly simply
cloth with some wind to get the base movement then added a couple of waves
over the top. The trick with waves and flags is to use linear waves, one or
two fairly low frequency then a couple of high frequency on top. Vary the
frequency, speed and orientation very slightly for each wave.
If you want real fine ripples then use a Perlin noise shader to bump or
displace it.
__ __
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf Of
Morten Bartholdy
Sent: 31 March 2004 23:53
To: XSI@(protected)
Subject: Cloth sim flag ripples?
I am working on creating a flag being pulled through the air, looking for a
nice rippling slowmotion style effect. I seem to be unable to get
satisfactory result with noise, and setting up complex systems of fans prove
difficult to control.
Noise seems to affect the flag in a non turbulent random way like a noise
field deforming the cloth rather than rippling it. I really wonder why we
can't use turbulence forces on cloth - it seems so obvious to get realistic
motion from that.
Anybody care to share a tip or two - or should I go the good old way of hand
animating it with waves and all that?
Best Regards
Morten Bartholdy
3D Animator & Visual Effects Supervisor
Colorshop VFX
Denmark
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<DIV dir=ltr align=left><SPAN class=515262712-01042004><FONT face=Arial
color=#008080 size=2>I've never had satisfactory results using cloth alone but
using cloth with a combination of other deforms works well. Last time I used a
fairly simply cloth with some wind to get the base movement then added a couple
of waves over the top. The trick with waves and flags is to use linear waves,
one or two fairly low frequency then a couple of high frequency on top.
Vary the frequency, speed and orientation very slightly for each
wave.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=515262712-01042004><FONT face=Arial
color=#008080 size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=515262712-01042004><FONT face=Arial
color=#008080 size=2>If you want real fine ripples then use a Perlin noise
shader to bump or displace it.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=515262712-01042004><FONT face=Arial
color=#008080 size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=515262712-01042004></SPAN> </DIV><BR>
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style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #008080 2px solid;
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<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> owner-xsi@(protected)
[mailto:owner-xsi@(protected)] <B>On Behalf Of </B>Morten
Bartholdy<BR><B>Sent:</B> 31 March 2004 23:53<BR><B>To:</B>
XSI@(protected)<BR><B>Subject:</B> Cloth sim flag
ripples?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial size=2>I am working on creating a flag being pulled
through the air, looking for a nice rippling slowmotion style effect. I seem
to be unable to get satisfactory result with noise, and setting up complex
systems of fans prove difficult to control.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Noise seems to affect the flag in a non
turbulent
random way like a noise field deforming the cloth rather than rippling it. I
really wonder why we can't use turbulence forces on cloth - it seems so
obvious to get realistic motion from that.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Anybody care to share a tip or two - or should I
go the good old way of hand animating it with waves and all that?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Best Regards</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Morten Bartholdy<BR>3D Animator & Visual
Effects Supervisor<BR>Colorshop
VFX<BR>Denmark</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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