Also, as I'm sure you have seen, when you select a point on the *guide* =
hairs, the point is reperesented as a pair ("Hair.pnt[(166,8)]").
As I understand it the first value always corresponds to the vertex =
index on the emission geometry.
Can anyone confirm or deny that?
Cheers
_rob
----- Original Message -----=20
From: "Greg Smith" <greg(at)stanwinston.com>
To: "XSI_MailingList" <XSI(at)Softimage.COM>
Sent: Friday, August 04, 2006 5:05 PM
Subject: [scripting] finding source vertex of a hair strand
> I'm running into a little bit of a problem with hair. I've been trying
> to figure out what is the best way to find what vertex a hair strand =
is
> emitted from, since there doesn't seem to be a straight forward =
approach
> in the first place. What has worked for me up to this point is using =
the
> GetClosestLocations method from the hair emitter object, using the
> position data from the first point on each strand of hair. this work =
if
> your hair is projecting out perfectly perpendicular. However, in cases
> where the hair is styled and the first point of the hair strand =
resides
> closer to a neighboring vertex on the emission object, the method does
> not return the desired positional data.
> So I am curious is there indeed a way to fetch which vertex a hair
> strand is emitted from regardless of how that hair has been styled.
>=20
> Thanks,=20
>=20
> Greg
>=20
> ---
> Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in =
body:
> unsubscribe xsi
>
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<DIV><FONT face=3DArial size=3D2>How's your C++?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>From the SDK docs:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2><STRONG>CRenderHairAccessor Class=20
Reference</STRONG></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>This class provides access to the =
render hair=20
information exposed by the hair primitive. This information includes: =
the vertex=20
positions of each generated render hair, the root/tip radius values, the =
UVW,=20
weight map and vertex color values for each render hair root=20
location.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Also, </FONT><FONT face=3DArial =
size=3D2>as I'm sure=20
you have seen, when you select a point on the *guide* hairs, the point =
is=20
reperesented as a pair <FONT=20
size=3D2>("Hair.pnt[(166,8)]").</FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>As I understand it the first value =
<STRONG>always=20
</STRONG>corresponds to the vertex index on the emission =
geometry.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Can anyone confirm or deny =
that?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Cheers</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>_rob</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>----- Original Message ----- </FONT>
<DIV><FONT face=3DArial size=3D2>From: "Greg Smith" <</FONT><A=20
href=3D"mailto:greg(at)stanwinston.com"><FONT face=3DArial=20
size=3D2>greg(at)stanwinston.com</FONT></A><FONT face=3DArial =
size=3D2>></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>To: "XSI_MailingList" <</FONT><A=20
href=3D"mailto:XSI(at)Softimage.COM"><FONT face=3DArial=20
size=3D2>XSI(at)Softimage.COM</FONT></A><FONT face=3DArial =
size=3D2>></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Sent: Friday, August 04, 2006 5:05 =
PM</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Subject: [scripting] finding source =
vertex of a=20
hair strand</FONT></DIV></DIV>
<DIV><FONT face=3DArial><BR><FONT size=3D2></FONT></FONT></DIV><FONT =
face=3DArial=20
size=3D2>> I'm running into a little bit of a problem with hair. I've =
been=20
trying<BR>> to figure out what is the best way to find what vertex a =
hair=20
strand is<BR>> emitted from, since there doesn't seem to be a =
straight=20
forward approach<BR>> in the first place. What has worked for me up =
to this=20
point is using the<BR>> GetClosestLocations method from the hair =
emitter=20
object, using the<BR>> position data from the first point on each =
strand of=20
hair. this work if<BR>> your hair is projecting out perfectly =
perpendicular.=20
However, in cases<BR>> where the hair is styled and the first point =
of the=20
hair strand resides<BR>> closer to a neighboring vertex on the =
emission=20
object, the method does<BR>> not return the desired positional =
data.<BR>>=20
So I am curious is there indeed a way to fetch which vertex a =
hair<BR>>=20
strand is emitted from regardless of how that hair has been =
styled.<BR>>=20
<BR>> Thanks, <BR>> <BR>> Greg<BR>> <BR>> ---<BR>>=20
Unsubscribe? Mail </FONT><A =
href=3D"mailto:Majordomo(at)Softimage.COM"><FONT=20
face=3DArial size=3D2>Majordomo(at)Softimage.COM</FONT></A><FONT =
face=3DArial size=3D2>=20
with the following text in body:<BR>> unsubscribe=20
xsi<BR>></FONT></BODY></HTML>
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