 | | | Objects 2 particles scripts not working!? | Objects 2 particles scripts not working!? 2005-04-25 - By Morten Bartholdy
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Hi Brad,
My scripting skills are all but nonexistant, so I for one would be very
happy if you would care to write option 2 at some point, and given the
lack of a more direct way to move geometry with particle sims in XSI, I am
sure others would be really happy too.
Option 1 doesn't quite do the job since I need other rotations than
tangency. I did try plotting the particle paths, using Felix Gebhardts
script, but then I still needed the birth time, sizes and rotations of the
particles so it would be slow work to do manually.
Have a safe trip home!
--
best regards
Morten Bartholdy
Colorshop VFX
Denmark
On Mon, 25 Apr 2005 04:12:57 +0000, "brad" <brad@(protected)> wrote :
> Yes it's a snapshot of 1 frame, and it shows how to grab transforms out
of a particle cloud.
>
> To get motion on the nulls, there are options:
> 1- Plot the particle path, then constrain a null to the path. Rotation
is derived from path tangency.
> 2- Plot the particle position and rotation values per frame directly to
the local transform of the null.
> 3- Write a scripted op that counts particles and grabs position and
rotation data continuously.
>
> Options 1 and 2 are easier to script, but different from eachother. They
also are a a shot deal, so if you tune the cloud, you have to re-run the
script.
>
> Option 3 is harder to script, slower in performance, but would create
live links to your cloud.
>
> Option 2 would be easy to derive from the scripts I've already posted,
since the hard part of getting the transforms out of the cloud and onto a
null is already taken care of. It would need to be made into a loop that
grabs the transforms per frame, then plots them.
>
> I'll be on a long flight home shortly, so if nobody else picks up from
here I can write option 2, but it may be a couple of days.
>
> -Brad
>
>
>
>
> -- ----Original Message-- ----
> > That did the trick! Am I correct in assuming this is a sort of
snapshot
> > particles script - it doesn't constrain the nulls to the particles so
the
> > nulls follow the animation!?
> >
> > Morten
> >
> >
> > On Sun, 24 Apr 2005 04:44:58 +0000, "brad" <brad@(protected)> wrote :
> >
> > > It is indeed jscript. When you install the script, make sure to
press
> > the parse button at the bottom of the install PPG.
> > >
> > > In XSI, you can have a single script file with many functions. When
you
> > parse the script, you can specify which function and input arguments
you
> > want XSI to run when you run the command or press the button. In this
> > case, there is only one function, so that one will be selected by
default.
> > >
> > > -Brad
> > > -- ----Original Message-- ----
> > > >��Thanks again Brad - that seems to want to do the trick.
> > > >��
> > > >��Now I have little clue about scripting - from the syntax I am
guessing
> > > >��this is jscript, so I gave it a .js extension, changed XSI
scripting
> > to
> > > >��jscript, selected the cloud and tried running it, but it doesn't
> > really do
> > > >��anything in that case. How do I put it to use?
> > > >��
> > > >��I really appreciate you taking the time Brad.
> > > >��
> > > >��best
> > > >��Morten
> > > >��
> > > >��
> > > >��
> > > >��On Sat, 23 Apr 2005 18:57:07 +0000, "brad" <brad@(protected)>
wrote :
> > > >��
> > > >��> There's no pleasing some people! :-)
> > > >��>
> > > >��> Here's a version that only works on clouds (since a point
collection
> > > >��doesn't have rotation data), and includes rotation and scale in
the
> > > >��transform. I'm also grabbing the size from the particle and
setting
> > the
> > > >��null size parameter. You could use the particle size to set the
null
> > scale
> > > >��if you want:
> > > >��>
> > > >��> function NullsOnCloud(inCloud)
> > > >��> {
> > > >��> ��if(!inCloud) inCloud = selection(0);
> > > >��>
> > > >��> ��// Get global transform from inCloud
> > > >��> ��var gTrans = inCloud.kinematics.global.transform;
> > > >��>
> > > >��> ��// Get particle collection from inCloud
> > > >��> ��var particles = inCloud.ActivePrimitive.particles;
> > > >��>
> > > >��> ��// For each particle, create a null and transform it to
the point
> > > >��> ��var rootNull = ActiveSceneRoot.AddNull('ParticleNulls');
> > > >��> ��for(var i=0; i<particles.count; i++){
> > > >��>
> > > >��> �� ��var pTrans = XSIMath.CreateTransform();
> > > >��>
> > > >��> �� ��// Set local translation from particle
> > > >��> �� ��var pos = particles(i).position;
> > > >��> �� ��pTrans.SetTranslation(pos);
> > > >��>
> > > >��> �� ��// Set local rotation from particle
> > > >��> �� ��var rot = particles(i).rotation;
> > > >��> �� ��pTrans.SetRotationFromXYZAngles(rot);
> > > >��>
> > > >��> �� ��// Multiply local transform by global trans of
cloud
> > > >��> �� ��pTrans.MulInPlace(gTrans);
> > > >��>
> > > >��> �� ��// Create null and set global transform
> > > >��> �� ��var node = rootNull.AddNull('particle' + i
+ 'Null');
> > > >��> �� ��node.kinematics.global.transform = pTrans;
> > > >��>
> > > >��> �� ��// Set the size of the null from the particle
size
> > > >��> �� ��node.size.value = particles(i).size;
> > > >��> ��}
> > > >��> }
> > > >��>
> > > >��>
> > > >��>
> > > >��> -- ----Original Message-- ----
> > > >��> >��Thanks Brad! I will give it a spin. From looking through
it, it
> > > >��doesn't
> > > >��> >��give me particle rotations though does it?
> > > >��> >��
> > > >��> >��
> > > >��> >��Morten
> > > >��> >��
> > > >��> >��
> > > >��> >��On Sat, 23 Apr 2005 18:14:14 +0000, "brad" <brad@(protected)
soup.com>
> > wrote :
> > > >��> >��
> > > >��> >��> Below is a function that creates a null on each point of
any
> > input
> > > >��> >��object (poly, nurb, or cloud). It can be parsed and made
into a
> > > >��command
> > > >��> >��button which will work on any selected object. It should be
> > pretty
> > > >��easy to
> > > >��> >��hack if you need to replace the nulls with your own
collection of
> > > >��objects:
> > > >��> >��>
> > > >��> >��> function NullsOnPoints(inObj)
> > > >��> >��> {
> > > >��> >��> ��// If nothing input, use the selection
> > > >��> >��> ��if(!inObj) inObj = selection(0);
> > > >��> >��>
> > > >��> >��> ��// Get global transform from inObj
> > > >��> >��> ��var gTrans = inObj.kinematics.global.transform;
> > > >��> >��> ��var pTrans = XSIMath.CreateTransform();
> > > >��> >��>
> > > >��> >��> ��// Get point collection from inObj
> > > >��> >��> ��var points =
inObj.ActivePrimitive.geometry.points;
> > > >��> >��>
> > > >��> >��> ��// For each point, create a null and transform
it to the
> > point
> > > >��> >��> ��var rootNull = ActiveSceneRoot.AddNull
('PosNulls');
> > > >��> >��> ��for(var i=0; i<points.count; i++){
> > > >��> >��>
> > > >��> >��> �� ��// Get position vector of point
> > > >��> >��> �� ��var pos = points(i).position;
> > > >��> >��>
> > > >��> >��> �� ��// Multiply position by the global
transform of
> > the object
> > > >��> >��center
> > > >��> >��> �� ��pos.MulByTransformationInPlace(gTrans);
> > > >��> >��> �� ��pTrans.SetTranslation(pos);
> > > >��> >��>
> > > >��> >��> �� ��// Create null and set global transform
> > > >��> >��> �� ��var node = rootNull.AddNull('pnt' + i
+ 'Null');
> > > >��> >��> �� ��node.kinematics.global.transform =
pTrans;
> > > >��> >��> ��}
> > > >��> >��> }
> > > >��> >��> // END FUNCTION -- ---- ---- ---- ---- ---- ---- ---- ---
> > > >��> >��>
> > > >��> >��>
> > > >��> >��> -Brad
> > > >��> >��> CG Soup
> > > >��> >��>
> > > >��> >��>
> > > >��> >��> -- ----Original Message-- ----
> > > >��> >��> >��I need to put objects on particles - not particle
instances
> > as I
> > > >��need
> > > >��> >��to
> > > >��> >��> >��see where objects intersect with a collision surface. I
> > tried the
> > > >��> >��various
> > > >��> >��> >��scripts for attaching objects to particles, but they
all
> > fail :(
> > > >��> >��> >��
> > > >��> >��> >��I tried Olivier Lelardoux original one as well as the
> > modified
> > > >��ones by
> > > >��> >��> >��Todd Akita and Eric Lampi. They fail with different
> > messages and
> > > >��I
> > > >��> >��can't
> > > >��> >��> >��seem to get them to work, so I'm thinking maybe they
don't
> > work
> > > >��in
> > > >��> >��4.2!?
> > > >��> >��> >��
> > > >��> >��> >��I have tried all different combinations on picking
> > sessions, but
> > > >��> >��still no
> > > >��> >��> >��go - has anyone tried and made one of these scripts
work in
> > 4.2
> > > >��and
> > > >��> >��if so,
> > > >��> >��> >��could you give me a short do's and dont's list?
> > > >��> >��> >��
> > > >��> >��> >��TIA!
> > > >��> >��> >��
> > > >��> >��> >��
> > > >��> >��> >��--
> > > >��> >��> >��best regards
> > > >��> >��> >��
> > > >��> >��> >��Morten Bartholdy
> > > >��> >��> >��Colorshop VFX
> > > >��> >��> >��Denmark
> > > >��> >��> >��---
> > > >��> >��> >��Unsubscribe? Mail Majordomo@(protected) with the
following
> > > >��text in
> > > >��> >��body:
> > > >��> >��> >��unsubscribe xsi
> > > >��> >��> -- ----Original Message-- ----
> > > >��> >��> ---
> > > >��> >��> Unsubscribe? Mail Majordomo@(protected) with the
following
> > text in
> > > >��> >��body:
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> > > >��> >��>
> > > >��> >��>
> > > >��> >��>
> > > >��> >��
> > > >��> >��--
> > > >��> >��best regards
> > > >��> >��
> > > >��> >��Morten Bartholdy
> > > >��> >��Colorshop VFX
> > > >��> >��Denmark
> > > >��> >��
> > > >��> >��---
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> > > >��>
> > > >��>
> > > >��
> > > >��--
> > > >��best regards
> > > >��
> > > >��Morten Bartholdy
> > > >��Colorshop VFX
> > > >��Denmark
> > > >��
> > > >��
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> > >
> >
> > --
> > best regards
> >
> > Morten Bartholdy
> > Colorshop VFX
> > Denmark
> >
> >
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