 | | | Objects 2 particles scripts not working!? | Objects 2 particles scripts not working!? 2005-04-24 - By brad
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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)>
> 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:
> > >��> >��> unsubscribe xsi
> > >��> >��>
> > >��> >��>
> > >��> >��>
> > >��> >��
> > >��> >��--
> > >��> >��best regards
> > >��> >��
> > >��> >��Morten Bartholdy
> > >��> >��Colorshop VFX
> > >��> >��Denmark
> > >��> >��
> > >��> >��---
> > >��> >��Unsubscribe? Mail Majordomo@(protected) with the following
> text in
> > >��body:
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> > >��> -- ----Original Message-- ----
> > >��>
> > >��> ---
> > >��> Unsubscribe? Mail Majordomo@(protected) with the following text in
> > >��body:
> > >��> unsubscribe xsi
> > >��>
> > >��>
> > >��>
> > >��
> > >��--
> > >��best regards
> > >��
> > >��Morten Bartholdy
> > >��Colorshop VFX
> > >��Denmark
> > >��
> > >��
> > >��---
> > >��Unsubscribe? Mail Majordomo@(protected) with the following text in
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> > -- ----Original Message-- ----
> >
> > ---
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> >
> >
>
> --
> best regards
>
> Morten Bartholdy
> Colorshop VFX
> Denmark
>
>
> ---
> Unsubscribe? Mail Majordomo@(protected) with the following text in body:
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