Re: polygonizer and small particles

[Jason S]

  
  
Huh!
  
  On 04/13/16 6:22, Chris Marshall wrote:


  Another solution you might be able to try, which
I've used in certain situations, is to create a polygon object
in ICE with Convert Instances to Mesh on an empty Polygon Mesh,
from your particle cloud. Obviously you need to use a simple
sphere or icosohedron as the instanced particle. You can then
shrinkwrap your polygoniser object onto this, for a super tight
fit.

  
  
On 13 April 2016 at 11:01, Chris
  Marshall 
  wrote:
  
I've done quite a bit of this and the only
  way I could get a tighter 'fit' was to scale everything
  up.


  

  On 12 April 2016 at 21:28,
Jason S 
wrote:

  
In case you might have missed it or if it
  would make a difference, but there are
  polygonizer settings under both the generated
  polygonizer mesh, as well as the existing
  polygonized elements.
  (only the generated polygonizer mesh setting
  popup when aplying it)
  

  
  On 04/12/16 15:00, Kris Rivel wrote:

  


  

  Thanks guys...just seems
like the built in polygonizer has a
limit to how "tight" it can create a
mesh around very small particles. I just
need to maybe scale the character up,
simulate, than maybe shrink it down.
  
  
On Fri, Apr 8,
  2016 at 5:26 PM, Steven Caron 
  wrote:
  
For particles below
  some threshold just render them as
  spheres?
*written with my thumbs
On
Apr 8, 2016 1:00 PM, "Kris
Rivel" 

wrote:
  
  
  
So I have some small
  particles I want to
  polygonize. Using the
  built in version. I can't
  seem to get the mesh
  really tight/close to the
  particles. I can get there
  a bit with some insane
  settings but its too slow
  and not close enough. Is
  it sensitive to particle
  size in relation to SI
  units? Do they need to be
  larger?
  

Kris
  
  
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Re: Distribute between knots? Know the percentage position of a knot?

[Olivier Jeannel]

Hey Pedro,
Not sure I understand what you are after, but to bounce on Cesar (^^)
there's a fit bezier node in ice, and also Bradley - master -Gabe explain
how to build your own.

https://vimeo.com/11016782
https://vimeo.com/11079196


On Wed, Apr 13, 2016 at 2:52 PM, Cesar Saez  wrote:

> Hi,
>
> I think you are mixing up the U coordinate, also known as the "time" of
> the cubic equation (or whatever you choose to go with) used under the hood,
> with a linearly distributed points on a curve (basically a post process
> done after the initial interpolation, length based instead of "time" based).
>
> So, if you want to get "percentages" based on the length you will have to
> calculate it yourself on top of the existing interpolation given by
> softimage curves, You basically take the full length, divide it in discrete
> segments generating samples (corresponding to a known percentage) and remap
> U values linear interpolating to the closest sample point, the more samples
> the more precise the results will be (this is common practice, even
> softimage uses internally an approximated approach to get the length of
> curves by adding discrete segments).
>
> I think there's a linearly interpolated bezier compound in the examples
> that can be used as inspiration of how to go about it (or was in rray.de?).
> Although depending on the use case a custom node might provide a more
> performant solution.
>
> Cheers!
>
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Re: polygonizer and small particles

[Chris Marshall]

Thanks Olivier, I had a 'lightbulb' moment one day. It doesn't happen very
often.

On 13 April 2016 at 13:30, Olivier Jeannel  wrote:

> Super clever !
>
> On Wed, Apr 13, 2016 at 1:29 PM, Chris Marshall  > wrote:
>
>> Exactly! Once you have the shrinkwarp working, you can do all sorts of
>> things. The 'blocks in a sock' look was exactly what I was after, but you
>> could smooth it etc to get the look you're after.
>>
>>
>> On 13 April 2016 at 12:21, Ed Manning  wrote:
>>
>>> On Wed, Apr 13, 2016 at 6:22 AM, Chris Marshall <
>>> chrismarshal...@gmail.com> wrote:
>>>
 Another solution you might be able to try, which I've used in certain
 situations, is to create a polygon object in ICE with Convert Instances to
 Mesh on an empty Polygon Mesh, from your particle cloud. Obviously you need
 to use a simple sphere or icosohedron as the instanced particle. You can
 then shrinkwrap your polygoniser object onto this, for a super tight fit.

>>>
>>> Oh, that's smart. Wish I'd thought of that a few weeks ago when I was
>>> trying to do something similar. I imagine you could then run a relax/smooth
>>> on the wrapped mesh to reduce the "blocks in a sock" look.
>>>
>>>
>>>
>>> --
>>> Softimage Mailing List.
>>> To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com
>>> with "unsubscribe" in the subject, and reply to confirm.
>>>
>>
>>
>>
>> --
>> Chris Marshall
>> Mint Motion Limited
>> 029 20 37 27 57
>> 07730 533 115
>> www.mintmotion.co.uk
>> www.dot3d.com
>>
>>
>>
>> --
>> Softimage Mailing List.
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>> with "unsubscribe" in the subject, and reply to confirm.
>>
>
>
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>



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07730 533 115
www.mintmotion.co.uk
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Re: Distribute between knots? Know the percentage position of a knot?

[Cesar Saez]

Hi,

I think you are mixing up the U coordinate, also known as the "time" of the
cubic equation (or whatever you choose to go with) used under the hood,
with a linearly distributed points on a curve (basically a post process
done after the initial interpolation, length based instead of "time" based).

So, if you want to get "percentages" based on the length you will have to
calculate it yourself on top of the existing interpolation given by
softimage curves, You basically take the full length, divide it in discrete
segments generating samples (corresponding to a known percentage) and remap
U values linear interpolating to the closest sample point, the more samples
the more precise the results will be (this is common practice, even
softimage uses internally an approximated approach to get the length of
curves by adding discrete segments).

I think there's a linearly interpolated bezier compound in the examples
that can be used as inspiration of how to go about it (or was in rray.de?).
Although depending on the use case a custom node might provide a more
performant solution.

Cheers!
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Re: polygonizer and small particles

[Chris Marshall]

...shrinkwrap...

On 13 April 2016 at 12:29, Chris Marshall  wrote:

> Exactly! Once you have the shrinkwarp working, you can do all sorts of
> things. The 'blocks in a sock' look was exactly what I was after, but you
> could smooth it etc to get the look you're after.
>
>
> On 13 April 2016 at 12:21, Ed Manning  wrote:
>
>> On Wed, Apr 13, 2016 at 6:22 AM, Chris Marshall <
>> chrismarshal...@gmail.com> wrote:
>>
>>> Another solution you might be able to try, which I've used in certain
>>> situations, is to create a polygon object in ICE with Convert Instances to
>>> Mesh on an empty Polygon Mesh, from your particle cloud. Obviously you need
>>> to use a simple sphere or icosohedron as the instanced particle. You can
>>> then shrinkwrap your polygoniser object onto this, for a super tight fit.
>>>
>>
>> Oh, that's smart. Wish I'd thought of that a few weeks ago when I was
>> trying to do something similar. I imagine you could then run a relax/smooth
>> on the wrapped mesh to reduce the "blocks in a sock" look.
>>
>>
>>
>> --
>> Softimage Mailing List.
>> To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com
>> with "unsubscribe" in the subject, and reply to confirm.
>>
>
>
>
> --
> Chris Marshall
> Mint Motion Limited
> 029 20 37 27 57
> 07730 533 115
> www.mintmotion.co.uk
> www.dot3d.com
>
>
>


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Chris Marshall
Mint Motion Limited
029 20 37 27 57
07730 533 115
www.mintmotion.co.uk
www.dot3d.com
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Re: polygonizer and small particles

[Olivier Jeannel]

Super clever !

On Wed, Apr 13, 2016 at 1:29 PM, Chris Marshall 
wrote:

> Exactly! Once you have the shrinkwarp working, you can do all sorts of
> things. The 'blocks in a sock' look was exactly what I was after, but you
> could smooth it etc to get the look you're after.
>
>
> On 13 April 2016 at 12:21, Ed Manning  wrote:
>
>> On Wed, Apr 13, 2016 at 6:22 AM, Chris Marshall <
>> chrismarshal...@gmail.com> wrote:
>>
>>> Another solution you might be able to try, which I've used in certain
>>> situations, is to create a polygon object in ICE with Convert Instances to
>>> Mesh on an empty Polygon Mesh, from your particle cloud. Obviously you need
>>> to use a simple sphere or icosohedron as the instanced particle. You can
>>> then shrinkwrap your polygoniser object onto this, for a super tight fit.
>>>
>>
>> Oh, that's smart. Wish I'd thought of that a few weeks ago when I was
>> trying to do something similar. I imagine you could then run a relax/smooth
>> on the wrapped mesh to reduce the "blocks in a sock" look.
>>
>>
>>
>> --
>> Softimage Mailing List.
>> To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com
>> with "unsubscribe" in the subject, and reply to confirm.
>>
>
>
>
> --
> Chris Marshall
> Mint Motion Limited
> 029 20 37 27 57
> 07730 533 115
> www.mintmotion.co.uk
> www.dot3d.com
>
>
>
> --
> Softimage Mailing List.
> To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com
> with "unsubscribe" in the subject, and reply to confirm.
>
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Re: polygonizer and small particles

[Chris Marshall]

Exactly! Once you have the shrinkwarp working, you can do all sorts of
things. The 'blocks in a sock' look was exactly what I was after, but you
could smooth it etc to get the look you're after.


On 13 April 2016 at 12:21, Ed Manning  wrote:

> On Wed, Apr 13, 2016 at 6:22 AM, Chris Marshall  > wrote:
>
>> Another solution you might be able to try, which I've used in certain
>> situations, is to create a polygon object in ICE with Convert Instances to
>> Mesh on an empty Polygon Mesh, from your particle cloud. Obviously you need
>> to use a simple sphere or icosohedron as the instanced particle. You can
>> then shrinkwrap your polygoniser object onto this, for a super tight fit.
>>
>
> Oh, that's smart. Wish I'd thought of that a few weeks ago when I was
> trying to do something similar. I imagine you could then run a relax/smooth
> on the wrapped mesh to reduce the "blocks in a sock" look.
>
>
>
> --
> Softimage Mailing List.
> To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com
> with "unsubscribe" in the subject, and reply to confirm.
>



-- 
Chris Marshall
Mint Motion Limited
029 20 37 27 57
07730 533 115
www.mintmotion.co.uk
www.dot3d.com
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Re: polygonizer and small particles

[Ed Manning]

On Wed, Apr 13, 2016 at 6:01 AM, Chris Marshall 
wrote:

> I've done quite a bit of this and the only way I could get a tighter 'fit'
> was to scale everything up.
>

When I've had to do something that requires a scale change to work
properly, I've sometimes been able to do the "scale-up" in ICE by: get
PointPosition => multiplyByScalar => set PointPosition, then doing whatever
scale-dependent operations, then reversing the scaling. Sometimes these can
all live in one ICEtree, sometimes they may have to be applied as
sequential trees. You can make the reverse scaling automatic even in
multiple trees by passing the scale factor as a new attribute, then getting
that value in the reverse.
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Re: polygonizer and small particles

[Ed Manning]

On Wed, Apr 13, 2016 at 6:22 AM, Chris Marshall 
wrote:

> Another solution you might be able to try, which I've used in certain
> situations, is to create a polygon object in ICE with Convert Instances to
> Mesh on an empty Polygon Mesh, from your particle cloud. Obviously you need
> to use a simple sphere or icosohedron as the instanced particle. You can
> then shrinkwrap your polygoniser object onto this, for a super tight fit.
>

Oh, that's smart. Wish I'd thought of that a few weeks ago when I was
trying to do something similar. I imagine you could then run a relax/smooth
on the wrapped mesh to reduce the "blocks in a sock" look.
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Re: Sticking particles over a cached cloth

[peter_b]

afaik 
‘on enter state’ executes once (on one frame only) when the particle changes to 
this state.
so rather plug it in the port ‘on every frame’ (or whatever it’s called) for 
continuing to evaluate the stick node. 


From: Pierre Schiller 
Sent: Tuesday, April 12, 2016 10:08 PM
To: softimage@listproc.autodesk.com 
Subject: Sticking particles over a cached cloth

Hello team. Good day. I am caching a syflex simulation (collitions and wind) 
for a simple grid.

On the second phase, that grid should emit simple spheres and those particles 
should stick to the grid while it´s deforming.


I used the stick to surface compound, making it evaluate  from 
the ICE execute node. Simulation starts well, but just as soon as the cloth 
(grid) changes shape, all spheres, remain were they were originated. They only 
move  (and stay frozen) if the cloth touches them.


Maybe this is a simple question, but I´m going in circles, I don´t know where 
else to tweak to get the cached sim work with those spheres.


Please help.

thanks.


David R.


-- 

Portfolio 2013

Cinema & TV production
Video Reel



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Re: polygonizer and small particles

[Chris Marshall]

Another solution you might be able to try, which I've used in certain
situations, is to create a polygon object in ICE with Convert Instances to
Mesh on an empty Polygon Mesh, from your particle cloud. Obviously you need
to use a simple sphere or icosohedron as the instanced particle. You can
then shrinkwrap your polygoniser object onto this, for a super tight fit.


On 13 April 2016 at 11:01, Chris Marshall  wrote:

> I've done quite a bit of this and the only way I could get a tighter 'fit'
> was to scale everything up.
>
> On 12 April 2016 at 21:28, Jason S  wrote:
>
>> In case you might have missed it or if it would make a difference, but
>> there are polygonizer settings under both the generated polygonizer mesh,
>> as well as the existing polygonized elements.
>> (only the generated polygonizer mesh setting popup when aplying it)
>>
>>
>> On 04/12/16 15:00, Kris Rivel wrote:
>>
>> Thanks guys...just seems like the built in polygonizer has a limit to how
>> "tight" it can create a mesh around very small particles. I just need to
>> maybe scale the character up, simulate, than maybe shrink it down.
>>
>> On Fri, Apr 8, 2016 at 5:26 PM, Steven Caron  wrote:
>>
>>> For particles below some threshold just render them as spheres?
>>>
>>> *written with my thumbs
>>> On Apr 8, 2016 1:00 PM, "Kris Rivel"  wrote:
>>>
 So I have some small particles I want to polygonize. Using the built in
 version. I can't seem to get the mesh really tight/close to the particles.
 I can get there a bit with some insane settings but its too slow and not
 close enough. Is it sensitive to particle size in relation to SI units? Do
 they need to be larger?

 Kris

 --
 Softimage Mailing List.
 To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com
 with "unsubscribe" in the subject, and reply to confirm.

>>>
>>> --
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>>> with "unsubscribe" in the subject, and reply to confirm.
>>>
>>
>>
>>
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>> "unsubscribe" in the subject, and reply to confirm.
>>
>>
>>
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>
>
>
> --
> Chris Marshall
> Mint Motion Limited
> 029 20 37 27 57
> 07730 533 115
> www.mintmotion.co.uk
> www.dot3d.com
>
>
>


-- 
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07730 533 115
www.mintmotion.co.uk
www.dot3d.com
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Re: polygonizer and small particles

[Chris Marshall]

I've done quite a bit of this and the only way I could get a tighter 'fit'
was to scale everything up.

On 12 April 2016 at 21:28, Jason S  wrote:

> In case you might have missed it or if it would make a difference, but
> there are polygonizer settings under both the generated polygonizer mesh,
> as well as the existing polygonized elements.
> (only the generated polygonizer mesh setting popup when aplying it)
>
>
> On 04/12/16 15:00, Kris Rivel wrote:
>
> Thanks guys...just seems like the built in polygonizer has a limit to how
> "tight" it can create a mesh around very small particles. I just need to
> maybe scale the character up, simulate, than maybe shrink it down.
>
> On Fri, Apr 8, 2016 at 5:26 PM, Steven Caron  wrote:
>
>> For particles below some threshold just render them as spheres?
>>
>> *written with my thumbs
>> On Apr 8, 2016 1:00 PM, "Kris Rivel"  wrote:
>>
>>> So I have some small particles I want to polygonize. Using the built in
>>> version. I can't seem to get the mesh really tight/close to the particles.
>>> I can get there a bit with some insane settings but its too slow and not
>>> close enough. Is it sensitive to particle size in relation to SI units? Do
>>> they need to be larger?
>>>
>>> Kris
>>>
>>> --
>>> Softimage Mailing List.
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>>> with "unsubscribe" in the subject, and reply to confirm.
>>>
>>
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>>
>
>
>
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-- 
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www.mintmotion.co.uk
www.dot3d.com
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