I was wondering what attributes are being read, to tell the Particle Gnomon to draw correctly? I'd like to just use that data as a small coordinate system, but I'm confused about where Houdini is reading it from… Obviously, Z is in the direction of velocity, but there isn't any orient or up that I can see.
Thanks!
What attribute(s) used to draw Particle Gnomon on screen?
2922 7 2- goldleaf
- Staff
- 4193 posts
- Joined: Sept. 2007
- Online
- fxrod
- Member
- 133 posts
- Joined: July 2005
- Offline
- goldleaf
- Staff
- 4193 posts
- Joined: Sept. 2007
- Online
- malexander
- Staff
- 5199 posts
- Joined: July 2005
- Offline
- fxrod
- Member
- 133 posts
- Joined: July 2005
- Offline
It's based on orient, and if that's not present, it uses v, up and q (quaterion) to establish a frame of reference. In your case, it's using just using v.
1. If up is not user-defined, does it default to (0, 1, 0)?
2. I haven't seen the q attribute. Where does this get generated?
All good info.
Francisco Rodriguez
Effects Animator | Walt Disney Animation Studios
Effects Animator | Walt Disney Animation Studios
- goldleaf
- Staff
- 4193 posts
- Joined: Sept. 2007
- Online
In addition to those two questions (thanks Francisco!):
- If Houdini does use 0,1,0 as a default Up under the hood, does that change when Houdini is set to Z-Up? Or is it simply hard wired?
- Is there some preference or variable which allows for writing out these q/up values as attributes? If not, I'll submit an RFE, as that would be super handy
- If Houdini does use 0,1,0 as a default Up under the hood, does that change when Houdini is set to Z-Up? Or is it simply hard wired?
- Is there some preference or variable which allows for writing out these q/up values as attributes? If not, I'll submit an RFE, as that would be super handy
I'm o.d.d.
- ben-andersen
- Member
- 47 posts
- Joined: Jan. 2014
- Offline
Hey Goldleaf :-)
You might find this helpful:
http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=6679 [sidefx.com]
You might find this helpful:
http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=6679 [sidefx.com]
- goldleaf
- Staff
- 4193 posts
- Joined: Sept. 2007
- Online
-
- Quick Links