Mixed Context

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Ognjen Vukovic

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Jul 18, 2013, 9:04:21 AM7/18/13
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Hi, i am sitting here with a friend who has a Houdini background and we came up with some questions that i though might be best addressed here.

So any help or a nudge in the right direction would be greatly appreciated.

Firstly, is there a way to address mixed context in ice, for instance by getting the point index of an object, can we somehow work within the polygon context of the point being calculated.

Here is a small preview, idealy i would like to get local subdivisions only on the polygons closest the dino. The prolem seems to occur when you try to switch context between point to poly, ice seems to ignore the input...


Inline image 1

 Also theoretical how would ice handle the generation of new indexes on top of the already baked in index, is this a dynamic process and would it mess up with the set point Index's..

Cheers,
Ogi.
dino.PNG

Gustavo Eggert Boehs

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Jul 18, 2013, 9:27:31 AM7/18/13
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Hi Ogi, no clue about your topology question, but here is an old screenshot on how to convert data from different mesh element's contexts:
http://xsisupport.files.wordpress.com/2012/03/change20context.png


2013/7/18 Ognjen Vukovic <ogn...@gmail.com>
dino.PNG

Gustavo Eggert Boehs

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Jul 18, 2013, 9:29:20 AM7/18/13
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So just a further comment on that screenshot, you do have to choose what to do with the point that since it is a many to one situation. In the screenshot you can see two situations exemplified one getting data as an array, and other averaging it. Other options would be getting min, max, and so on...


2013/7/18 Gustavo Eggert Boehs <gust...@gmail.com>
dino.PNG

Gustavo Eggert Boehs

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Jul 18, 2013, 9:30:45 AM7/18/13
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arrg... "point data" not "point that" sorry

Ognjen Vukovic

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Jul 18, 2013, 9:33:51 AM7/18/13
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Ok , got that.

Thanks Gustavo.

Vladimir Jankijevic

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Jul 18, 2013, 11:05:38 AM7/18/13
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here is a screen shot how you could achieve this with some basic filtering and without building huge arrays if the geometry is dense. It's also crucial to understand where the search is being performed from. Thus the last example where we first distribute points on the surface so that we search in a more stochastic manner "of the surface" instead of just the middle points of polys or edges. Hope this helps a bit

Cheers
Vladimir

differentContexts_comp.jpg

Ognjen Vukovic

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Jul 18, 2013, 12:21:58 PM7/18/13
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Thanks for the heads up Vladimir, im not at work right now, so ill check this up tomorrow but it seems like a step in the right direction.


Cheers,
Ogi.


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