[Sidefx-houdini-list] smart polygon reduction

Simon Barrick simon at primalpictures.com
Wed Dec 12 08:46:36 EST 2007


The public beta of H9.1 now includes additional polyreduce tools that
are also worth having a look at. Sesi have extended the functality to
include non triangular meshes, a nice weight attribute for controlling
the decimation and a topology parameter which I haven't really worked
out yet.
Si

-----Original Message-----
From: sidefx-houdini-list-bounces at sidefx.com
[mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Simon
Barrick
Sent: 10 December 2007 10:04
To: sidefx-houdini-list at sidefx.com
Subject: Re: [Sidefx-houdini-list] smart polygon reduction


Have you ever tried greduce? It's a bit slow but uses a different
reduction algorithm that might be more suitable to what you are doing.
Si

-----Original Message-----
From: sidefx-houdini-list-bounces at sidefx.com
[mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Ben
Schrijvers
Sent: 10 December 2007 10:04
To: sidefx-houdini-list at sidefx.com
Subject: Re: [Sidefx-houdini-list] smart polygon reduction


Hi Darran,

I'm using PolyReduce quite a lot.
Indeed equalize edges gives a good result but less optimized in that 
flat areas get the same amount of poly's then curved areas.
But you could always do a few in a row..

You could also deform your geometry before the reduction and then deform

it back.
So like in case of the terain you could scale up in Y to get more 
resolution in that dimension.
By deforming back I just mean you should store the original position as 
an attribute and use that after the reduction as your possition.

What I would love for the Reduce Sop though would be a slider to reduce 
by correlation.
So that you can guarentee a certain minimum amount of shape change. I
now build that myselve with a couple of Poly Reduce's and switches to 
pit the best one.

cheers,
benS

Darran Edmundson wrote:
> I have a 6000x8000 regular terrain grid that I'd like to intelligently

> reduce to various levels-of-detail (1000k, 500k, 250k, 100k
> triangles).  The polygon reduction in Houdini has - in my experience -

> never been particularly impressive.   That's a shame, because lots of

> other packages like PolyWorks, NuGraph, PolygonCruncher for Max have
> obviously solved the problem procedurally.  Or am I just doing it  
> wrong ...  And if not Houdini, and not wanting to buy yet-another- 
> package, what options are there?  Are there companies around that will

> do mesh optimization?
>
> Cheers,
> Darran.
> _______________________________________________
> Sidefx-houdini-list mailing list Sidefx-houdini-list at sidefx.com 
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>
>   

_______________________________________________
Sidefx-houdini-list mailing list
Sidefx-houdini-list at sidefx.com
https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list

______________________________________________________________________
This communication is from Primal Pictures Ltd., a company registered in
England and Wales with registration No. 02622298 and registered office:
4th Floor, Tennyson House, 159-165 Great Portland Street, London, W1W
5PA, UK. VAT registration No. 648874577.

This e-mail is confidential and may be privileged. It may be read,
copied and used only by the intended recipient. If you have received it
in error, please contact the sender immediately by return e-mail or by
telephoning +44(0)20 7637 1010. Please then delete the e-mail and do not
disclose its contents to any person. This email has been scanned for
Primal Pictures by the MessageLabs Email Security System.
______________________________________________________________________
_______________________________________________
Sidefx-houdini-list mailing list
Sidefx-houdini-list at sidefx.com
https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list

______________________________________________________________________
This communication is from Primal Pictures Ltd., a company registered in England and Wales with registration No. 02622298 and registered office: 4th Floor, Tennyson House, 159-165 Great Portland Street, London, W1W 5PA, UK. VAT registration No. 648874577.

This e-mail is confidential and may be privileged. It may be read, copied and used only by the intended recipient. If you have received it in error, please contact the sender immediately by return e-mail or by telephoning +44(0)20 7637 1010. Please then delete the e-mail and do not disclose its contents to any person.
This email has been scanned for Primal Pictures by the MessageLabs Email Security System.
______________________________________________________________________



More information about the Sidefx-houdini-list mailing list