[Sidefx-houdini-list] change geometry w/out triangulating

Erika Salatiello tictacer at hotmail.com
Thu Apr 8 01:18:10 EDT 2010


Thanks Sean! 

This will definitely come in handy.  

Erika

> To: sidefx-houdini-list at sidefx.com
> CC: sidefx-houdini-list at sidefx.com; sidefx-houdini-list-bounces at sidefx.com
> From: Sean.Lewkiw at cis-vancouver.com
> Date: Wed, 7 Apr 2010 12:19:08 -0700
> Subject: Re: [Sidefx-houdini-list] change geometry w/out triangulating
> 
> Here is an example of how it can be done, save text below as file foo.cmd 
> and then "hescape foo.cmd"  to load. 
> 
> # Automatically generated script: Wednesday April 07, 12:11
> \set noalias = 1
> set saved_path = `execute("oppwf")`
> opcf /obj
> 
> # Node geo1 (Object/geo)
> opadd -n geo geo1
> oplocate -x 0 -y 0 geo1
> opset -S on geo1
> opparm geo1 use_dcolor ( off )
> chautoscope geo1 +tx +ty +tz +rx +ry +rz +sx +sy +sz
> opset -d on -r off -h off -f off -y off -t off -l off -s off -u off -c off 
> -e on -b off -x off geo1
> opexprlanguage -s hscript geo1
> opcf geo1
> 
> # Node hi_rez_rest (Sop/sphere)
> opadd -n sphere hi_rez_rest
> oplocate -x -0.116192 -y -0.649589 hi_rez_rest
> opparm hi_rez_rest type ( poly ) freq ( 6 )
> opset -d off -r off -h off -f off -y off -t off -l off -s off -u off -c 
> off -e on -b off hi_rez_rest
> opexprlanguage -s hscript hi_rez_rest
> 
> # Node animate_1 (Sop/mountain)
> opadd -n mountain animate_1
> oplocate -x 2.37431 -y -0.931292 animate_1
> chblockbegin
> chadd -f 1 1 animate_1 offset1
> chkey -f 1 -v 2.6 -m 0 -a 0 -A 0 -T a  -F '$FF' animate_1/offset1
> chblockend
> opparm animate_1 offset ( offset1 0 0 )
> opset -d off -r off -h off -f off -y off -t off -l off -s off -u off -c 
> off -e on -b off animate_1
> opexprlanguage -s hscript animate_1
> 
> # Node lo_rez_rest (Sop/sphere)
> opadd -n sphere lo_rez_rest
> oplocate -x -1.58647 -y -2.36652 lo_rez_rest
> opparm lo_rez_rest type ( poly ) freq ( 1 )
> opset -d off -r off -h off -f off -y off -t off -l off -s off -u off -c 
> off -e on -b off lo_rez_rest
> opexprlanguage -s hscript lo_rez_rest
> 
> # Node encode_pt_pos_in_Cd (Sop/point)
> opadd -n point encode_pt_pos_in_Cd
> oplocate -x -0.116192 -y -3.61498 encode_pt_pos_in_Cd
> opparm encode_pt_pos_in_Cd  numcustom ( 1 )
> chblockbegin
> chadd -f 1 1 encode_pt_pos_in_Cd tx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$TX' encode_pt_pos_in_Cd/tx
> chadd -f 1 1 encode_pt_pos_in_Cd ty
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$TY' encode_pt_pos_in_Cd/ty
> chadd -f 1 1 encode_pt_pos_in_Cd tz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$TZ' encode_pt_pos_in_Cd/tz
> chadd -f 1 1 encode_pt_pos_in_Cd weight
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$WEIGHT' 
> encode_pt_pos_in_Cd/weight
> chadd -f 1 1 encode_pt_pos_in_Cd diffr
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$TX2' encode_pt_pos_in_Cd/diffr
> chadd -f 1 1 encode_pt_pos_in_Cd diffg
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$TY2' encode_pt_pos_in_Cd/diffg
> chadd -f 1 1 encode_pt_pos_in_Cd diffb
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$TZ2' encode_pt_pos_in_Cd/diffb
> chadd -f 1 1 encode_pt_pos_in_Cd alpha
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$CA' encode_pt_pos_in_Cd/alpha
> chadd -f 1 1 encode_pt_pos_in_Cd nx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$NX' encode_pt_pos_in_Cd/nx
> chadd -f 1 1 encode_pt_pos_in_Cd ny
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$NY' encode_pt_pos_in_Cd/ny
> chadd -f 1 1 encode_pt_pos_in_Cd nz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$NZ' encode_pt_pos_in_Cd/nz
> chadd -f 1 1 encode_pt_pos_in_Cd mapu
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$MAPU' encode_pt_pos_in_Cd/mapu
> chadd -f 1 1 encode_pt_pos_in_Cd mapv
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$MAPV' encode_pt_pos_in_Cd/mapv
> chadd -f 1 1 encode_pt_pos_in_Cd mapw
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$MAPW' encode_pt_pos_in_Cd/mapw
> chadd -f 1 1 encode_pt_pos_in_Cd tension
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$TENSION' 
> encode_pt_pos_in_Cd/tension
> chadd -f 1 1 encode_pt_pos_in_Cd springk
> chkey -f 1 -v 30 -m 0 -a 0 -A 0 -T a  -F '$SPRINGK' 
> encode_pt_pos_in_Cd/springk
> chadd -f 1 1 encode_pt_pos_in_Cd vx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$VX' encode_pt_pos_in_Cd/vx
> chadd -f 1 1 encode_pt_pos_in_Cd vy
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$VY' encode_pt_pos_in_Cd/vy
> chadd -f 1 1 encode_pt_pos_in_Cd vz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$VZ' encode_pt_pos_in_Cd/vz
> chadd -f 1 1 encode_pt_pos_in_Cd upx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$UPX' encode_pt_pos_in_Cd/upx
> chadd -f 1 1 encode_pt_pos_in_Cd upy
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$UPY' encode_pt_pos_in_Cd/upy
> chadd -f 1 1 encode_pt_pos_in_Cd upz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$UPZ' encode_pt_pos_in_Cd/upz
> chadd -f 1 1 encode_pt_pos_in_Cd pscale
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$PSCALE' 
> encode_pt_pos_in_Cd/pscale
> chblockend
> opparm encode_pt_pos_in_Cd doclr ( on ) diff ( diffr diffg diffb )
> opset -d off -r off -h off -f off -y off -t off -l off -s off -u off -c 
> off -e on -b off encode_pt_pos_in_Cd
> opexprlanguage -s hscript encode_pt_pos_in_Cd
> 
> # Node animated_2 (Sop/xform)
> opadd -n xform animated_2
> oplocate -x 2.37431 -y -2.01815 animated_2
> chblockbegin
> chadd -f 1 1 animated_2 ty
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F 'sin($FF*33)' animated_2/ty
> chblockend
> opparm animated_2 t ( 0 ty 0 )
> opset -d off -r off -h off -f off -y off -t off -l off -s off -u off -c 
> off -e on -b off animated_2
> opexprlanguage -s hscript animated_2
> 
> # Node transfer_Cd_to_lo_rez (Sop/attribtransfer)
> opadd -n attribtransfer transfer_Cd_to_lo_rez
> oplocate -x -1.2401 -y -4.45198 transfer_Cd_to_lo_rez
> opparm transfer_Cd_to_lo_rez primitiveattribs ( off )
> opset -d off -r off -h off -f off -y off -t off -l off -s off -u off -c 
> off -e on -b off transfer_Cd_to_lo_rez
> opexprlanguage -s hscript transfer_Cd_to_lo_rez
> 
> # Node make_point_positions_value_of_Cd (Sop/point)
> opadd -n point make_point_positions_value_of_Cd
> oplocate -x -1.2401 -y -5.38893 make_point_positions_value_of_Cd
> opparm make_point_positions_value_of_Cd  numcustom ( 1 )
> chblockbegin
> chadd -f 1 1 make_point_positions_value_of_Cd tx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$CR' 
> make_point_positions_value_of_Cd/tx
> chadd -f 1 1 make_point_positions_value_of_Cd ty
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$CG' 
> make_point_positions_value_of_Cd/ty
> chadd -f 1 1 make_point_positions_value_of_Cd tz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$CB' 
> make_point_positions_value_of_Cd/tz
> chadd -f 1 1 make_point_positions_value_of_Cd weight
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$WEIGHT' 
> make_point_positions_value_of_Cd/weight
> chadd -f 1 1 make_point_positions_value_of_Cd diffr
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$CR' 
> make_point_positions_value_of_Cd/diffr
> chadd -f 1 1 make_point_positions_value_of_Cd diffg
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$CG' 
> make_point_positions_value_of_Cd/diffg
> chadd -f 1 1 make_point_positions_value_of_Cd diffb
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$CB' 
> make_point_positions_value_of_Cd/diffb
> chadd -f 1 1 make_point_positions_value_of_Cd alpha
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$CA' 
> make_point_positions_value_of_Cd/alpha
> chadd -f 1 1 make_point_positions_value_of_Cd nx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$NX' 
> make_point_positions_value_of_Cd/nx
> chadd -f 1 1 make_point_positions_value_of_Cd ny
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$NY' 
> make_point_positions_value_of_Cd/ny
> chadd -f 1 1 make_point_positions_value_of_Cd nz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$NZ' 
> make_point_positions_value_of_Cd/nz
> chadd -f 1 1 make_point_positions_value_of_Cd mapu
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$MAPU' 
> make_point_positions_value_of_Cd/mapu
> chadd -f 1 1 make_point_positions_value_of_Cd mapv
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$MAPV' 
> make_point_positions_value_of_Cd/mapv
> chadd -f 1 1 make_point_positions_value_of_Cd mapw
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$MAPW' 
> make_point_positions_value_of_Cd/mapw
> chadd -f 1 1 make_point_positions_value_of_Cd tension
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$TENSION' 
> make_point_positions_value_of_Cd/tension
> chadd -f 1 1 make_point_positions_value_of_Cd springk
> chkey -f 1 -v 30 -m 0 -a 0 -A 0 -T a  -F '$SPRINGK' 
> make_point_positions_value_of_Cd/springk
> chadd -f 1 1 make_point_positions_value_of_Cd vx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$VX' 
> make_point_positions_value_of_Cd/vx
> chadd -f 1 1 make_point_positions_value_of_Cd vy
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$VY' 
> make_point_positions_value_of_Cd/vy
> chadd -f 1 1 make_point_positions_value_of_Cd vz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$VZ' 
> make_point_positions_value_of_Cd/vz
> chadd -f 1 1 make_point_positions_value_of_Cd upx
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$UPX' 
> make_point_positions_value_of_Cd/upx
> chadd -f 1 1 make_point_positions_value_of_Cd upy
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$UPY' 
> make_point_positions_value_of_Cd/upy
> chadd -f 1 1 make_point_positions_value_of_Cd upz
> chkey -f 1 -v 0 -m 0 -a 0 -A 0 -T a  -F '$UPZ' 
> make_point_positions_value_of_Cd/upz
> chadd -f 1 1 make_point_positions_value_of_Cd pscale
> chkey -f 1 -v 1 -m 0 -a 0 -A 0 -T a  -F '$PSCALE' 
> make_point_positions_value_of_Cd/pscale
> chblockend
> opparm make_point_positions_value_of_Cd t ( tx ty tz )
> opset -d on -r on -h off -f off -y off -t off -l off -s off -u off -c off 
> -e on -b off make_point_positions_value_of_Cd
> opexprlanguage -s hscript make_point_positions_value_of_Cd
> 
> # Node ANIMATED_hi_rez (Sop/null)
> opadd -n null ANIMATED_hi_rez
> oplocate -x 2.46175 -y -3.00507 ANIMATED_hi_rez
> opset -d off -r off -h off -f off -y off -t on -l off -s off -u off -c off 
> -e on -b off ANIMATED_hi_rez
> opexprlanguage -s hscript ANIMATED_hi_rez
> oporder -e hi_rez_rest animate_1 lo_rez_rest encode_pt_pos_in_Cd 
> animated_2 transfer_Cd_to_lo_rez make_point_positions_value_of_Cd 
> ANIMATED_hi_rez 
> opcf ..
> 
> opcf /obj
> opcf geo1
> opwire -n hi_rez_rest -0 animate_1
> opwire -n hi_rez_rest -0 encode_pt_pos_in_Cd
> opwire -n ANIMATED_hi_rez -1 encode_pt_pos_in_Cd
> opwire -n animate_1 -0 animated_2
> opwire -n lo_rez_rest -0 transfer_Cd_to_lo_rez
> opwire -n encode_pt_pos_in_Cd -1 transfer_Cd_to_lo_rez
> opwire -n transfer_Cd_to_lo_rez -0 make_point_positions_value_of_Cd
> opwire -n animated_2 -0 ANIMATED_hi_rez
> opcf ..
> opcf $saved_path
> 
> 
> --
> Sean Lewkiw - Digital FX Supervisor
> CIS Vancouver
> 50 West 2nd Avenue
> Vancouver BC V5Y 1B3
> P:  (604) 874-8700
> 
> 
> 
> 
> From:   Sean.Lewkiw at cis-vancouver.com
> To:     sidefx-houdini-list at sidefx.com
> Date:   04/06/2010 10:36 AM
> Subject:        Re: [Sidefx-houdini-list] change geometry w/out 
> triangulating
> Sent by:        sidefx-houdini-list-bounces at sidefx.com
> 
> 
> 
> Would it be difficult to build the same model from scratch or edit the 
> existing one to add detail (or clean-up) for a single rest frame?
> 
> If you could do this, you can then take the fugly deforming model, store 
> point positions in colour, transfer these point positions to your static 
> fugly geo, then do an attribute transfer to your new clean geo, then 
> finally use a point SOP to move your nice clean geo so that it matches the 
> 
> fugly geo's point position.
> 
> If that's not clear, I can send an example. 
> 
> Sean
> 
> 
> 
> 
> --
> Sean Lewkiw - Digital FX Supervisor
> CIS Vancouver
> 50 West 2nd Avenue
> Vancouver BC V5Y 1B3
> P:  (604) 874-8700
> 
> 
> 
> 
> From:
> Erika Salatiello <tictacer at hotmail.com>
> To:
> user group <sidefx-houdini-list at sidefx.com>
> Date:
> 04/05/2010 02:56 PM
> Subject:
> Re: [Sidefx-houdini-list] change geometry w/out triangulating
> Sent by:
> sidefx-houdini-list-bounces at sidefx.com
> 
> 
> 
> 
> oh!  and I found the sop that allows division control by axis - it's the 
> Divide SOP and choose the bricker option :D
> 
> > From: tictacer at hotmail.com
> > To: sidefx-houdini-list at sidefx.com
> > Date: Mon, 5 Apr 2010 21:51:46 +0000
> > Subject: Re: [Sidefx-houdini-list] change geometry w/out triangulating
> > 
> > 
> > 
> > Thanks Ivan/Floyd - I was sitting there going damnit if this were nurbs 
> it would be easier - lol - duh.  (Does it count that it was Monday here??)
> > 
> > I am using the cloth solvers to do plastic deformation stuff and the 
> cloth tools are topology based so I need to be able to work with as clean 
> and accurate a model as possible.  The original object had tons of edges 
> in Y and only 2 in X  so I need to add detail in X and get rid of it in Y. 
> 
>  When I point consolidate it'll force triangulation instead of just 
> grabbing the closest Y points and make a mess of the topology. 
> > 
> > I think converting it to nurbs will work well, and then just being 
> patient for my proxy geo  :)
> > 
> > Floyd! How on earth is Japan?  And the bird?  hehe.  Mr Burns is back in 
> 
> SF with babysitters :(
> > 
> > 
> > 
> > > Date: Mon, 5 Apr 2010 12:16:49 +0300
> > > From: eoyilmaz at gmail.com
> > > To: sidefx-houdini-list at sidefx.com
> > > Subject: Re: [Sidefx-houdini-list] change geometry w/out triangulating
> > > 
> > > Why do you want to keep quads, is there any particular reason for that 
> 
> ?
> > > 
> > > E.Ozgur Yilmaz
> > > Lead Technical Director
> > > www.ozgurfx.com
> > > 
> > > 
> > > On Mon, Apr 5, 2010 at 12:04 PM, Simon Barrick 
> <simon at primalpictures.com>wrote:
> > > 
> > > > I'm not aware of any tool that will let you reduce poly counts 
> without
> > > > triangulation. You could do it manually by selecting and dissolving 
> edge
> > > > loops. You might also need the facet sops remove inline points to 
> clean up
> > > > before any further subdividing operations.
> > > > Also never seen a subdivide operation that will let you choose the
> > > > direction of subdivision. However if you have nice regular patches 
> you can
> > > > convert to meshes and do all manner of operations to increase or 
> decrease
> > > > the resolution in u and v.
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: sidefx-houdini-list-bounces at sidefx.com on behalf of Erika 
> Salatiello
> > > > Sent: Mon 05/04/2010 02:12
> > > > To: user group
> > > > Subject: [Sidefx-houdini-list] change geometry w/out triangulating
> > > >
> > > >
> > > > I'm curious if anyone knows a good node or way to reduce and 
> increase polys
> > > > on geometry.
> > > >
> > > > The object I am working with is nice clean quads.  I DO NOT want to
> > > > triangulate the shape.  I have more than enough polys in the Y 
> direction and
> > > > not enough in X.  I was surprised when I went to use the subdivide 
> sop that
> > > > it would only work on all the polys evenly and I couldn't choose to 
> control
> > > > the direction.  I think I am forgetting about another sop that does 
> this?
> > > >
> > > > Also, for reducing geo, the polyreduce sop is not ideal since it's 
> again
> > > > working via triangulating and the facet sop (consolidate points 
> etc.) seems
> > > > to also be choosing to consolidate via triangulation.
> > > >
> > > > I am hoping to get some low rez proxy geos later this week from the
> > > > modelers but any quick tips would be appreciated.
> > > >
> > > > Thanks,
> > > > Erika
> > > >
> > > > _________________________________________________________________
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