expressions question 2004-05-25 - By Graham D Clark
Back
use getBBox to get the geometries min max values as diameter then use
that value as diameter in the line where you apply your expression,
or if you need the radius to animate over time (and the object has been
frozen or has no radius parmeter) then afaik you'll need to make a scop
for it.
it gets a little trickier if you want to 'steer' your wheel too and
have it roate correclty in any direction but animating the wheels on
paths and using path percentage value to rotate can make that math a lot
easier
-- ---- ---- ---- ---- ---- --
http://www.grahamdclark.com <http://www.grahamdclark.com/>
2nd hand TD
-- --Original Message-- --
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf
Of alex dinnin
Sent: May 25, 2004 12:40 PM
To: XSI@(protected)
Subject: Re: expressions question
Am I correct in saying then, that if you have frozen the object !!! you
can not use the radius ???
thanks for the help on this everyone....
Peter Twardo <peliosis_v2@(protected)> wrote:
Well, since the amount of rotation, depends on both : translation, and
radius of an object, your expression could't work.
I hope this helps:
(Try changing radius of your cylinder or whatever if you havent frozen
it)
' ******************************************
CreatePrim "Cylinder", "MeshSurface"
Rotate , 90, 0, 0, siAbsolute, siParent, siObj, siX
ResetTransform "cylinder", siCtr, siRot, siXYZ
InspectObj "cylinder.kine.local"
AddExpr "cylinder.kine.local.rotz"
SetExpr "cylinder.kine.local.rotz",
"cylinder.kine.local.posx*-(360/(2*PI*cylinder.polymsh.geom.cylinder.rad
ius))"
' ******************************
Peter
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<DIV><SPAN class=334265114-25052004><FONT face=Arial color=#0000ff size=2>use
getBBox to get the geometries min max values as diameter then use that
value as diameter in the line where you apply your
expression,</FONT></SPAN></DIV>
<DIV><SPAN class=334265114-25052004><FONT face=Arial color=#0000ff size=2>or if
you need the radius to animate over time (and the object has been frozen
or
has no radius parmeter) then afaik you'll need to make a scop for
it.</FONT></SPAN></DIV>
<DIV><SPAN class=334265114-25052004><FONT face=Arial color=#0000ff size=2>it
gets a little trickier if you want to 'steer' your wheel too and have it
roate correclty in any direction but animating the wheels on paths and
using path percentage value to rotate can make that math a lot
easier</FONT></SPAN></DIV>
<DIV><FONT face="Times New Roman">-- ---- ---- ---- ---- ---- --</FONT>
<BR><FONT face="Times New Roman"><A
href="http://www.grahamdclark.com/">http://www.grahamdclark.com</A></FONT>
<BR><FONT face="Times New Roman">2nd hand TD</FONT> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid;
MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-- --Original Message-- --<BR><B>From:</B>
owner-xsi@(protected) [mailto:owner-xsi@(protected)] <B>On Behalf Of
</B>alex dinnin<BR><B>Sent:</B> May 25, 2004 12:40 PM<BR><B>To:</B>
XSI@(protected)<BR><B>Subject:</B> Re: expressions
question<BR><BR></FONT></DIV>
<DIV>Am I correct in saying then, that if you have frozen the object !!! you
can not use the radius ???</DIV>
<DIV> </DIV>
<DIV>thanks for the help on this everyone....<BR><BR><B><I>Peter Twardo
<peliosis_v2@(protected)></I></B> wrote:</DIV>
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<DIV><FONT size=2>
<P><FONT face=Arial>Well, since the amount of rotation, depends on both :
translation, and radius of an object, your expression could't
work.</FONT></P>
<P><FONT face=Arial>I hope this helps:</FONT></P>
<P><FONT face=Arial>(Try changing radius of your cylinder or whatever if
you
havent frozen it)</FONT></P>
<P><FONT face=Arial></FONT> </P>
<P><FONT face=Arial>' ******************************************</FONT></P>
<P>CreatePrim "Cylinder", "MeshSurface"</P>
<P>Rotate , 90, 0, 0, siAbsolute, siParent, siObj, siX</P>
<P>ResetTransform "cylinder", siCtr, siRot, siXYZ</P>
<P>InspectObj "cylinder.kine.local"</P>
<P>AddExpr "cylinder.kine.local.rotz"</P>
<P>SetExpr "cylinder.kine.local.rotz",
"<STRONG>cylinder.kine.local.posx*-(360/(2*PI*cylinder.polymsh.geom
.cylinder.radius))</STRONG>"</P>
<P>' ******************************</P>
<P><FONT face=Arial></FONT> </P>
<P><FONT face=Arial>Peter</FONT></P></FONT></DIV></BLOCKQUOTE>
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