[Sidefx-houdini-list] Space filling circles
Nick Zutphen
nvanzutphen at live.com
Sun Aug 14 08:28:34 EDT 2011
Ghehe,
Good stuff Martin :-)
Nick van Zutphen
----
http://www.nickvanzutphen.com
On Aug 11, 2011, at 1:59 AM, Martin Sawtell wrote:
> Aha!!
> http://paulbourke.net/texture_colour/randomtile/
>
> :)
>
> -M
>
> On 10 August 2011 03:11, Andrew Lyons <tstexture at gmail.com> wrote:
>
>> Cool! I wonder if he works with the Crystal Method much? :)
>>
>>
>> On 7 August 2011 04:11, Martin Sawtell <martin at msawtell.com> wrote:
>>
>>> I saw Paul Bourke put some recent renders up that were along this theme,
>> he
>>> has this paper on his website:
>>> http://paulbourke.net/texture_colour/randomtile/paper.pdf
>>> It's about filling space with fractal patterns, might be of interest.
>>> Here's
>>> his public album:
>>>
>>>
>> https://plus.google.com/photos/117410063754013499525/albums/5627585387387080737
>>>
>>>
>>> -M
>>>
>>>
>>> On 30 July 2011 05:50, Doug Struthers <dragonfly at dougstruthers.com>
>> wrote:
>>>
>>>> As I began this thread I should say it was not me though I did find
>> other
>>>> artistic uses and then carved them from wood. All the help on this
>>>> previously was most helpful.
>>>>
>>>> Cheers
>>>>
>>>>
>>>> On Fri, Jul 29, 2011 at 10:48 AM, Andrew Lyons <tstexture at gmail.com>
>>>> wrote:
>>>>
>>>>> Looks like someone found an artistic use for this:
>>>>>
>>>>>
>>>>>
>>>>
>>>
>> http://www.dj-tronic.com/dancefloormayhem.com/images/2009/TCM_albumcover.jpg
>>>>>
>>>>> I wonder who the mystery artist was. Anyone know who?
>>>>>
>>>>> Cheers
>>>>>
>>>>>
>>>>> On 6 August 2009 09:26, Andrew D Lyons <tstexture at gmail.com> wrote:
>>>>>> Yep - sorry about the line wrapping on that post. There is a more
>>>>>> succinct version of the script uploaded to here:
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>> http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=78063#78063
>>>>>>
>>>>>> Cheers
>>>>>>
>>>>>>
>>>>>> 2009/8/6 David Johnson <daveinengland at gmail.com>:
>>>>>>> I had to edit the example to fix the line wraps that the email put
>>> in,
>>>>> but
>>>>>>> after that it ran just fine. Maybe someone could put it on odforce
>>> or
>>>> in
>>>>> the
>>>>>>> SideFX forum.
>>>>>>>
>>>>>>> Dave
>>>>>>>
>>>>>>> On Thu, Aug 6, 2009 at 6:58 AM, Steve Tucker <
>>> Steve.Tucker at starz.com>
>>>>> wrote:
>>>>>>>
>>>>>>>> Interesting. If I attempt to run this in a new file, it doesn't
>>>> work.
>>>>>>>> Can't create the geo object. If I cd /obj and then try running
>>> it,
>>>> I
>>>>> get a
>>>>>>>> fatal exception error.
>>>>>>>>
>>>>>>>> - Steve
>>>>>>>>
>>>>>>>> Stephen Tucker, VFX Artist
>>>>>>>> p: 416.682.5200 x 5363 | f: 416.682.5209
>>>>>>>> Starz Media Canada Co. | 230 Richmond Street East | Toronto, ON
>> M5A
>>>> 1P4
>>>>>>>> www.starzanimation.com
>>>>>>>>
>>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: sidefx-houdini-list-bounces at sidefx.com [mailto:
>>>>>>>> sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Andrew D
>>> Lyons
>>>>>>>> Sent: Wednesday, August 05, 2009 7:07 PM
>>>>>>>> To: sidefx-houdini-list at sidefx.com
>>>>>>>> Subject: Re: [Sidefx-houdini-list] Space filling circles
>>>>>>>>
>>>>>>>> That's an interesting problem. Not exactly circular - but close:
>>>>>>>>
>>>>>>>> Drop this in a textport:
>>>>>>>> #######################################################
>>>>>>>>
>>>>>>>> # Automatically generated script: Wednesday August 05, 16:06
>>>>>>>> \set noalias = 1
>>>>>>>> set saved_path = `execute("oppwf")`
>>>>>>>> opcf /obj
>>>>>>>>
>>>>>>>> # Node circle_cells (Object/geo)
>>>>>>>> opadd -n geo circle_cells
>>>>>>>> oplocate -x 12.6117 -y 2.05949 circle_cells
>>>>>>>> opspareds ' group { name "stdswitcher5" label
>> "Transform"
>>>>>>>> parm
>>>>>>>> { name "keeppos" baseparm
>>> joinnext
>>>>>>>> export none }
>>>>>>>> parm { name "pre_xform" baseparm
>>>>> export
>>>>>>>> none } parm
>>>>>>>> { name "xOrd" baseparm joinnext
>>>>> export
>>>>>>>> none }
>>>>>>>> parm { name "rOrd" baseparm export
>>>>> none
>>>>>>>> } parm {
>>>>>>>> name "t" baseparm export all }
>>> parm
>>>> {
>>>>>>>> name "r"
>>>>>>>> baseparm export all } parm { name
>>>>> "s"
>>>>>>>> baseparm
>>>>>>>> export none } parm { name "p"
>>> baseparm
>>>>>>>> export none }
>>>>>>>> parm { name "scale" baseparm
>>>>> export
>>>>>>>> none } parm {
>>>>>>>> name "lookatpath" baseparm export none }
>>>>> parm
>>>>>>>> {
>>>>>>>> name "lookup" baseparm export none }
>>>>>>>> parm {
>>>>>>>> name "pathobjpath" baseparm export none }
>>>>>>>> parm {
>>>>>>>> name "roll" baseparm export none }
>>> parm
>>>> {
>>>>>>>> name "pos"
>>>>>>>> baseparm export none } parm {
>>>> name
>>>>>>>> "uparmtype"
>>>>>>>> baseparm export none } parm { name
>>>>>>>> "pathorient"
>>>>>>>> baseparm export none } parm { name
>>>>>>>> "up" baseparm
>>>>>>>> export none } parm { name "bank"
>>> baseparm
>>>>>>>> export none
>>>>>>>> } } group { name "stdswitcher5_1"
>>> label
>>>>>>>> "Material" parm
>>>>>>>> { name "shop_materialpath" baseparm
>>>>>>>> joinnext
>>>>>>>> export none } parm { name
>> "shop_materialopts"
>>>>>>>> baseparm
>>>>>>>> export none } } group { name "stdswitcher5_2"
>>>>>>>> label "Render" parm { name "tdisplay"
>>>>>>>> baseparm
>>>>>>>> export none } parm { name "display"
>>>>>>>> baseparm
>>>>>>>> export none } parm { name "vm_phantom"
>>>>> label
>>>>>>>> "Phantom"
>>>>>>>> type toggle default { "0" } range {
>> 0
>>> 1
>>>> }
>>>>>>>> export none
>>>>>>>> parmtag { "spare_category" "Render" } }
>> parm
>>> {
>>>>>>>> name "vm_renderable" label "Renderable"
>>>>> type
>>>>>>>> toggle
>>>>>>>> default { "1" } range { 0 1 }
>> export
>>>>>>>> none parmtag {
>>>>>>>> "spare_category" "Render" } } group { name
>>>>>>>> "folder0"
>>>>>>>> label "Shading" parm { name
>>> "categories"
>>>>>>>> label "Categories"
>>>>>>>> type string default { "" }
>> help
>>>>> "A
>>>>>>>> list of tags which can be
>>>>>>>> used to select the object" range { 0 1 }
>>>>>>>> export none parmtag {
>>>>>>>> "spare_category" "Shading" } } parm {
>>> name
>>>>>>>> "reflectmask"
>>>>>>>> label "Reflection Mask" type
>>> oplist
>>>>>>>> default { "*" } range { 0
>>>>>>>> 1 } export none parmtag { "oprelative"
>>> "/obj"
>>>> }
>>>>>>>> parmtag {
>>>>>>>> "opfilter" "!!OBJ/GEOMETRY!!" } parmtag {
>>>>> "spare_category"
>>>>>>>> "Shading"
>>>>>>>> } parmtag { "opexpand" "1" } } parm
>> {
>>>>>>>> name "lightmask"
>>>>>>>> label "Light Mask" type oplist
>>>>>>>> default { "*" } range { 0 1 }
>>>>>>>> export none parmtag { "oprelative"
>>> "/obj"
>>>> }
>>>>>>>> parmtag { "opfilter"
>>>>>>>> "!!OBJ/LIGHT!!" } parmtag { "spare_category"
>>> "Shading"
>>>> }
>>>>>>>> parmtag {
>>>>>>>> "opexpand" "1" } } parm { name
>>>>>>>> "vm_volumefilter"
>>>>>>>> label "Volume Filter" type
>>> string
>>>>>>>> default { "gaussian" }
>>>>>>>> menu { "box" "Box
>> Filter"
>>>>>>>> "gaussian" "Gaussian"
>>>>>>>> "bartlett" "Bartlett (triangle)" "catrom"
>>>>>>>> "Catmull-Rom"
>>>>>>>> "hanning" "Hanning" "blackman"
>> "Blackman"
>>>>>>>> "sinc" "Sinc
>>>>>>>> (sharpening)" } range { 0 1 }
>>>>>>>> export none parmtag {
>>>>>>>> "spare_category" "Shading" } } parm {
>>>>>>>> name "vm_volumefilterwidth" label
>>>> "Volume
>>>>>>>> Filter Width"
>>>>>>>> type float default { "1.5" }
>>>>>>>> range { 0.001 5 } export none
>>>>>>>> parmtag { "spare_category" "Shading" } }
>>>> parm
>>>>> {
>>>>>>>> name "vm_matte" label "Matte
>>>> shading"
>>>>>>>> type toggle default {
>>>>>>>> "0" } range { 0 1 } export none
>>>>>>>> parmtag { "spare_category"
>>>>>>>> "Shading" } } } group { name
>>>>> "folder0_1"
>>>>>>>> label "Sampling" parm { name
>>>>> "geo_velocityblur"
>>>>>>>> label "Geometry Velocity Blur"
>> type
>>>>>>>> toggle default { "0" }
>>>>>>>> range { 0 1 } export none
>>>>>>>> parmtag { "spare_category" "Sampling"
>>>>>>>> } } } group { name
>> "folder0_2"
>>>>>>>> label "Dicing"
>>>>>>>> parm { name "vm_shadingquality" label
>>>>> "Shading
>>>>>>>> Quality"
>>>>>>>> type float default { "1" }
>>>>>>>> range { 0 10 } export none
>>>>>>>> parmtag { "spare_category" "Dicing" } }
>>>> parm
>>>>> {
>>>>>>>> name "vm_rayshadingquality" label
>> "Ray
>>>>> Shading
>>>>>>>> Quality"
>>>>>>>> type float default { "1" }
>>>>>>>> range { 0 10 } export none
>>>>>>>> parmtag { "spare_category" "Dicing" } } }
>>>>>>>> group {
>>>>>>>> name "folder0_3" label "Geometry" parm
>> {
>>>>>>>> name "vm_rmbackface" label
>>>>> "Backface
>>>>>>>> Removal (Mantra)"
>>>>>>>> type toggle default { "0" }
>>>>>>>> range { 0 1 } export none
>>>>>>>> parmtag { "spare_category" "Geometry" }
>>> }
>>>>>>>> parm {
>>>>>>>> name "shop_geometrypath" label
>>>>> "Procedural
>>>>>>>> Shader" type oppath
>>>>>>>> default { "" } range { 0 1 }
>>>>>>>> export none parmtag {
>>>>>>>> "oprelative" "." } parmtag { "opfilter"
>>>>> "!!SHOP/GEOMETRY!!" }
>>>>>>>> parmtag { "spare_category" "Geometry" }
>>> }
>>>>>>>> parm {
>>>>>>>> name "vm_rendersubd" label
>>>>> "Polygons As
>>>>>>>> Subdivision (Mantra)"
>>>>>>>> type toggle default { "0" }
>>>>>>>> range { 0 1 } export none
>>>>>>>> parmtag { "spare_category" "Geometry" }
>>> }
>>>>>>>> parm {
>>>>>>>> name "vm_renderpoints" label
>>>> "Render
>>>>> As
>>>>>>>> Points (Mantra)"
>>>>>>>> type toggle default { "0" }
>>>>>>>> range { 0 1 } export none
>>>>>>>> parmtag { "spare_category" "Geometry" }
>>> }
>>>>>>>> parm {
>>>>>>>> name "vm_metavolume" label
>>>>> "Metaballs
>>>>>>>> as Volume" type toggle
>>>>>>>> default { "0" } range { 0 1 }
>>>>>>>> export none parmtag {
>>>>>>>> "spare_category" "Geometry" } } parm {
>>> name
>>>>>>>> "vm_coving"
>>>>>>>> label "Coving" type integer
>>>>>>>> default { "1" } menu {
>>>>>>>> "0" "Disable Coving" "1" "Coving for
>>>>>>>> displacement/sub-d"
>>>>>>>> "2" "Coving for all primitives" }
>>> range
>>>>> { 0
>>>>>>>> 10 } export none
>>>>>>>> parmtag { "spare_category" "Geometry" }
>>> }
>>>>>>>> parm {
>>>>>>>> name "vm_computeN" label
>>> "Automatically
>>>>>>>> Compute Normals"
>>>>>>>> type toggle default { "1" }
>>>>>>>> range { 0 1 } export none
>>>>>>>> parmtag { "spare_category" "Geometry" }
>>> }
>>>>> }
>>>>>>>> } group
>>>>>>>> { name "stdswitcher5_3" label "Misc"
>>> parm
>>>> {
>>>>>>>> name "use_dcolor"
>>>>>>>> baseparm export none } parm {
>>>> name
>>>>>>>> "dcolor"
>>>>>>>> baseparm export none } parm { name
>>>>>>>> "picking" baseparm
>>>>>>>> export none } parm { name
>>>>> "pickscript"
>>>>>>>> baseparm
>>>>>>>> export none } parm { name "caching"
>>>>>>>> baseparm
>>>>>>>> export none } parm { name "vport_shadeopen"
>>>>>>>> baseparm
>>>>>>>> export none } parm { name
>>>> "vport_displayassubdiv"
>>>>>>>> baseparm
>>>>>>>> invisible export none } } '
>>>> circle_cells
>>>>>>>> opset -S on circle_cells
>>>>>>>> opparm circle_cells use_dcolor ( off )
>>>>>>>> chautoscope circle_cells +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 circle_cells
>>>>>>>> opexprlanguage -s hscript circle_cells
>>>>>>>> opcf circle_cells
>>>>>>>>
>>>>>>>> # Node circle1 (Sop/circle)
>>>>>>>> opadd -n circle circle1
>>>>>>>> oplocate -x 3.41176 -y 0.0882355 circle1
>>>>>>>> opparm circle1 type ( poly ) orient ( zx ) rad ( 21 21 ) divs (
>> 100
>>> )
>>>>>>>> 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 circle1
>>>>>>>> opexprlanguage -s hscript circle1
>>>>>>>>
>>>>>>>> # Node triangulate2d1 (Sop/triangulate2d)
>>>>>>>> opadd -n triangulate2d triangulate2d1
>>>>>>>> oplocate -x 3.41176 -y -1.15882 triangulate2d1
>>>>>>>> opparm triangulate2d1 refine ( on ) maxarea ( 2 ) minangle ( 30 )
>>>>>>>> maxnewpts ( 19565 ) removeduplicatepoints ( 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 triangulate2d1
>>>>>>>> opexprlanguage -s hscript triangulate2d1
>>>>>>>>
>>>>>>>> # Node facet1 (Sop/facet)
>>>>>>>> opadd -n facet facet1
>>>>>>>> oplocate -x 3.50951 -y -3.19412 facet1
>>>>>>>> opparm facet1 unique ( on )
>>>>>>>> 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 facet1
>>>>>>>> opexprlanguage -s hscript facet1
>>>>>>>>
>>>>>>>> # Node foreach1 (Sop/foreach)
>>>>>>>> opadd -n foreach foreach1
>>>>>>>> oplocate -x 3.41176 -y -5.02471 foreach1
>>>>>>>> chblockbegin
>>>>>>>> chadd -t 0 0 foreach1 numrange2
>>>>>>>> chkey -t 0 -v 10 -m 0 -a 0 -A 0 -T a -F 'nprims("../" +
>>> opinput(".",
>>>>>>>> 0))-1' foreach1/numrange2
>>>>>>>> chblockend
>>>>>>>> opparm foreach1 fortype ( number ) numrange ( 0 numrange2 1 )
>>>>>>>> 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 foreach1
>>>>>>>> opexprlanguage -s hscript foreach1
>>>>>>>> opcf foreach1
>>>>>>>>
>>>>>>>> # Node each1 (Sop/each)
>>>>>>>> opadd -n each each1
>>>>>>>> oplocate -x 0.6102 -y 4.8513 each1
>>>>>>>> chblockbegin
>>>>>>>> chadd -t 0 0 each1 attribtol
>>>>>>>> chkey -t 0 -v 0.001 -m 0 -a 0 -A 0 -T a -F 'ch("../attribtol")'
>>>>>>>> each1/attribtol
>>>>>>>> chadd -t 0 0 each1 attribval1
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F 'stamp("..",
>>>>>>>> chs("../forstamp") + "1", 0)' each1/attribval1
>>>>>>>> chadd -t 0 0 each1 attribval2
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F 'stamp("..",
>>>>>>>> chs("../forstamp") + "2", 0)' each1/attribval2
>>>>>>>> chadd -t 0 0 each1 attribval3
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F 'stamp("..",
>>>>>>>> chs("../forstamp") + "3", 0)' each1/attribval3
>>>>>>>> chadd -t 0 0 each1 attrib
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F
>>>>>>>> 'ifs(!!strcmp(chs("../fortype"), "attrib"), "",
>> chs("../attrib"))'
>>>>>>>> each1/attrib
>>>>>>>> chadd -t 0 0 each1 group
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F
>>>>>>>> 'ifs(!!strcmp(chs("../fortype"), "group"), "", stamps("..",
>>>>>>>> chs("../forstamp"), ""))' each1/group
>>>>>>>> chadd -t 0 0 each1 feedback
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F '!ch("../mergeresults")'
>>>>>>>> each1/feedback
>>>>>>>> chblockend
>>>>>>>> opparm each1 feedback ( feedback ) group ( group ) attrib (
>> attrib
>>> )
>>>>>>>> attribval ( attribval1 attribval2 attribval3 ) attribtol (
>>> attribtol
>>>> )
>>>>>>>> forpath ( .. )
>>>>>>>> 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 each1
>>>>>>>> opexprlanguage -s hscript each1
>>>>>>>>
>>>>>>>> # Node delete2 (Sop/delete)
>>>>>>>> opadd -n delete delete2
>>>>>>>> oplocate -x 0.6102 -y 3.89295 delete2
>>>>>>>> chblockbegin
>>>>>>>> chadd -t 0 0 delete2 rangeend
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F '$N' delete2/rangeend
>>>>>>>> chadd -t 0 0 delete2 filter
>>>>>>>> chkey -t 0 -v 1 -m 0 -a 0 -A 0 -T a -F 'stamp("../", "FORVALUE",
>>> 0)
>>>>>>>> == prim("../" + opinput(".", 0), $PR, "__primnum", 0)'
>>> delete2/filter
>>>>>>>> chblockend
>>>>>>>> opparm delete2 negate ( keep ) groupop ( filter ) filter ( filter
>> )
>>>>>>>> pattern ( "" )
>>>>>>>> opset -d off -r off -h off -f off -y off -t off -l off -s off -u
>>> off
>>>>>>>> -c off -e on -b off delete2
>>>>>>>> opexprlanguage -s hscript delete2
>>>>>>>>
>>>>>>>> # Node fit1 (Sop/fit)
>>>>>>>> opadd -n fit fit1
>>>>>>>> oplocate -x 0.610753 -y 0.946953 fit1
>>>>>>>> opparm fit1 stdswitcher ( 2 2 2 ) method ( interp ) orderu ( 3 )
>>>>>>>> orderv ( 3 ) smooth ( 0.343 ) scope ( breakpnt ) dataparmv (
>>> uniform
>>>> )
>>>>>>>> closeu ( wu ) closev ( wv ) corners ( on )
>>>>>>>> opset -d on -r on -h off -f off -y off -t off -l off -s off -u
>> off
>>> -c
>>>>>>>> off -e on -b off fit1
>>>>>>>> opexprlanguage -s hscript fit1
>>>>>>>>
>>>>>>>> # Node circle1 (Sop/circle)
>>>>>>>> opadd -n circle circle1
>>>>>>>> oplocate -x 3.01075 -y 3.7 circle1
>>>>>>>> opset -d off -r off -h off -f off -y off -t off -l off -s off -u
>>> off
>>>>>>>> -c off -e on -b off circle1
>>>>>>>> opexprlanguage -s hscript circle1
>>>>>>>>
>>>>>>>> # Node resample1 (Sop/resample)
>>>>>>>> opadd -n resample resample1
>>>>>>>> oplocate -x 0.622517 -y 2.92353 resample1
>>>>>>>> opparm resample1 edge ( on ) dolength ( off ) dosegs ( on ) segs
>> (
>>> 2
>>>> )
>>>>>>>> opset -d off -r off -h off -f off -y off -t off -l off -s off -u
>>> off
>>>>>>>> -c off -e on -b off resample1
>>>>>>>> opexprlanguage -s hscript resample1
>>>>>>>>
>>>>>>>> # Node delete1 (Sop/delete)
>>>>>>>> opadd -n delete delete1
>>>>>>>> oplocate -x 0.610753 -y 1.85283 delete1
>>>>>>>> chblockbegin
>>>>>>>> chadd -t 0 0 delete1 rangeend
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F '$N' delete1/rangeend
>>>>>>>> chblockend
>>>>>>>> opparm delete1 entity ( point ) groupop ( range ) range ( -1
>>> rangeend
>>>> )
>>>>>>>> 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 delete1
>>>>>>>> opexprlanguage -s hscript delete1
>>>>>>>> oporder -e each1 delete2 fit1 circle1 resample1 delete1
>>>>>>>> opcf ..
>>>>>>>>
>>>>>>>> # Node __PRIMNUM (Sop/attribcreate)
>>>>>>>> opadd -n attribcreate __PRIMNUM
>>>>>>>> oplocate -x 3.41176 -y -4.07765 __PRIMNUM
>>>>>>>> chblockbegin
>>>>>>>> chadd -t 0 0 __PRIMNUM value1
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F '$PR' __PRIMNUM/value1
>>>>>>>> chblockend
>>>>>>>> opparm __PRIMNUM name ( __primnum ) varname ( __PRIMNUM ) class (
>>>>>>>> primitive ) value ( value1 0 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 __PRIMNUM
>>>>>>>> opexprlanguage -s hscript __PRIMNUM
>>>>>>>>
>>>>>>>> # Node foreach2 (Sop/foreach)
>>>>>>>> opadd -n foreach foreach2
>>>>>>>> oplocate -x 3.50951 -y -2.29415 foreach2
>>>>>>>> opparm foreach2 fortype ( number ) numrange ( 0 4 1 )
>> mergeresults
>>> (
>>>>> 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 foreach2
>>>>>>>> opexprlanguage -s hscript foreach2
>>>>>>>> opcf foreach2
>>>>>>>>
>>>>>>>> # Node each1 (Sop/each)
>>>>>>>> opadd -n each each1
>>>>>>>> oplocate -x 0.6102 -y 4.8513 each1
>>>>>>>> chblockbegin
>>>>>>>> chadd -t 0 0 each1 attribtol
>>>>>>>> chkey -t 0 -v 0.001 -m 0 -a 0 -A 0 -T a -F 'ch("../attribtol")'
>>>>>>>> each1/attribtol
>>>>>>>> chadd -t 0 0 each1 attribval1
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F 'stamp("..",
>>>>>>>> chs("../forstamp") + "1", 0)' each1/attribval1
>>>>>>>> chadd -t 0 0 each1 attribval2
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F 'stamp("..",
>>>>>>>> chs("../forstamp") + "2", 0)' each1/attribval2
>>>>>>>> chadd -t 0 0 each1 attribval3
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F 'stamp("..",
>>>>>>>> chs("../forstamp") + "3", 0)' each1/attribval3
>>>>>>>> chadd -t 0 0 each1 attrib
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F
>>>>>>>> 'ifs(!!strcmp(chs("../fortype"), "attrib"), "",
>> chs("../attrib"))'
>>>>>>>> each1/attrib
>>>>>>>> chadd -t 0 0 each1 group
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F
>>>>>>>> 'ifs(!!strcmp(chs("../fortype"), "group"), "", stamps("..",
>>>>>>>> chs("../forstamp"), ""))' each1/group
>>>>>>>> chadd -t 0 0 each1 feedback
>>>>>>>> chkey -t 0 -v 0 -m 0 -a 0 -A 0 -T a -F '!ch("../mergeresults")'
>>>>>>>> each1/feedback
>>>>>>>> chblockend
>>>>>>>> opparm each1 feedback ( feedback ) group ( group ) attrib (
>> attrib
>>> )
>>>>>>>> attribval ( attribval1 attribval2 attribval3 ) attribtol (
>>> attribtol
>>>> )
>>>>>>>> forpath ( .. )
>>>>>>>> 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 each1
>>>>>>>> opexprlanguage -s hscript each1
>>>>>>>>
>>>>>>>> # Node divide2 (Sop/divide)
>>>>>>>> opadd -n divide divide2
>>>>>>>> oplocate -x 0.6102 -y 3.42343 divide2
>>>>>>>> opparm divide2 convex ( off ) dual ( on )
>>>>>>>> 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 divide2
>>>>>>>> opexprlanguage -s hscript divide2
>>>>>>>> oporder -e each1 divide2
>>>>>>>> opcf ..
>>>>>>>> oporder -e circle1 triangulate2d1 facet1 foreach1 __PRIMNUM
>>> foreach2
>>>>>>>> opcf ..
>>>>>>>>
>>>>>>>> opcf /obj
>>>>>>>> opcf circle_cells
>>>>>>>> opwire -n circle1 -0 triangulate2d1
>>>>>>>> opwire -n foreach2 -0 facet1
>>>>>>>> opwire -n __PRIMNUM -0 foreach1
>>>>>>>> opcf foreach1
>>>>>>>> opwire -n -i 0 -0 each1
>>>>>>>> opwire -n each1 -0 delete2
>>>>>>>> opwire -n delete1 -0 fit1
>>>>>>>> opwire -n delete2 -0 resample1
>>>>>>>> opwire -n resample1 -0 delete1
>>>>>>>> opcf ..
>>>>>>>> opwire -n facet1 -0 __PRIMNUM
>>>>>>>> opwire -n triangulate2d1 -0 foreach2
>>>>>>>> opcf foreach2
>>>>>>>> opwire -n -i 0 -0 each1
>>>>>>>> opwire -n each1 -0 divide2
>>>>>>>> opcf ..
>>>>>>>> opcf ..
>>>>>>>> opcf $saved_path
>>>>>>>>
>>>>>>>> ######################################################
>>>>>>>>
>>>>>>>> 2009/8/5 Doug Struthers <dragonfly at dougstruthers.com>:
>>>>>>>>> Thanks for your inputs.
>>>>>>>>>
>>>>>>>>> Since there do not need to be thousands of them I bet I can
>>> iterate
>>>>> on
>>>>>>>> them
>>>>>>>>> to get a close approximation without taking a long long time to
>>>>> compute.
>>>>>>>>>
>>>>>>>>> It is intriguing to think that there may be a function with
>> dops
>>>> that
>>>>> the
>>>>>>>>> solution falls out of but I am still a way down the learning
>>> curve
>>>>> with
>>>>>>>> all
>>>>>>>>> the functionality that exists in vops let alone rolling my own.
>>>>>>>>>
>>>>>>>>> Cheers
>>>>>>>>>
>>>>>>>>> Doug
>>>>>>>>>
>>>>>>>>> On Wed, Aug 5, 2009 at 9:09 AM, Gene Dreitser <
>>> keyframe at rogers.com
>>>>>
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Might also be worth it to take a look at the output of the
>>>> isooffset
>>>>> sop
>>>>>>>>>> using the 'tetra-mesh' output type. Tetra-type set to
>> 'cubes'.
>>>>>>>>>>
>>>>>>>>>> While it will not pack perfectly, it DOES create a predictable
>>>>> pattern
>>>>>>>> of
>>>>>>>>>> rows and columns that one might be able to make use, and as an
>>>> added
>>>>>>>> bonus,
>>>>>>>>>> it can use ray-intersect to sample the original mesh.
>>>>>>>>>>
>>>>>>>>>> Best,
>>>>>>>>>>
>>>>>>>>>> G
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Gene Dreitser
>>>>>>>>>> Loki Visual Effects
>>>>>>>>>> p: 416.532.5654 // c: 416.803.0682 // www.lokivfx.com
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> ----- Original Message ----
>>>>>>>>>> From: Andy Nicholas <andy at andynicholas.com>
>>>>>>>>>> To: sidefx-houdini-list at sidefx.com
>>>>>>>>>> Sent: Wednesday, August 5, 2009 12:05:13 PM
>>>>>>>>>> Subject: Re: [Sidefx-houdini-list] Space filling circles
>>>>>>>>>>
>>>>>>>>>> Hi Doug,
>>>>>>>>>> Are you asking this because you know of this being done
>>> somewhere
>>>>> else?
>>>>>>>> I
>>>>>>>>>> only ask because I just Googled this (out of my own interest),
>>> and
>>>>>>>> judging
>>>>>>>>>> on how many papers are written on this topic, I'd say that
>> it's
>>> a
>>>>>>>>>> non-trivial problem to solve.
>>>>>>>>>>
>>>>>>>>>> The only thing that springs to mind, would be to create an
>>>> iterative
>>>>>>>>>> approach, using the SOP solver or the Feedback SOP
>>>> (proto_install).
>>>>>>>>>>
>>>>>>>>>> Note that I haven't tested this, or fully thought it through,
>>> but
>>>>> the
>>>>>>>>>> following... might... just... work...
>>>>>>>>>>
>>>>>>>>>> Start off with a triangular polygon with a random sized disc
>> at
>>>> each
>>>>>>>>>> vertex so that their circumferences touch. From that, take a
>>> pair
>>>> of
>>>>>>>> discs
>>>>>>>>>> and create another randomly sized one and place it (using
>> simple
>>>>>>>>>> trigonometry) so that it touches the first two. Extend the
>>>> triangle
>>>>> into
>>>>>>>> a
>>>>>>>>>> four sided polygon with the new point at the center of the new
>>>> disc.
>>>>>>>>>> Repeat the process, but ignoring any discs internal to the
>>>> polygon.
>>>>>>>>>>
>>>>>>>>>> I can see this approach breaking down if you ever have a
>>>> non-convex
>>>>>>>>>> polygon, but there are probably some constraints that you
>> could
>>>>> figure
>>>>>>>> out
>>>>>>>>>> that will prevent this from happening.
>>>>>>>>>>
>>>>>>>>>> Andy
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>> Hi
>>>>>>>>>>>
>>>>>>>>>>> Can anyone point me to a Houdini method (or other solution)
>>> for
>>>>>>>> packing
>>>>>>>>>>> random sized circles so that they are tightly packed and
>> each
>>>>>>>>>>> circumference
>>>>>>>>>>> just touches its neighbors?
>>>>>>>>>>>
>>>>>>>>>>> Thanks
>>>>>>>>>>>
>>>>>>>>>>> Doug
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> www.dougstruthers.com
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> 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
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Sidefx-houdini-list mailing list
>>>>>>>>>> Sidefx-houdini-list at sidefx.com
>>>>>>>>>>
>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> www.dougstruthers.com
>>>>>>>>> _______________________________________________
>>>>>>>>> Sidefx-houdini-list mailing list
>>>>>>>>> Sidefx-houdini-list at sidefx.com
>>>>>>>>>
>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> =======================================
>>>>>>>> Andrew D Lyons | Digital Artist | http://www.tstex.com
>>>>>>>> =======================================
>>>>>>>> _______________________________________________
>>>>>>>> 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
>>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Sidefx-houdini-list mailing list
>>>>>>> Sidefx-houdini-list at sidefx.com
>>>>>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> =======================================
>>>>>> Andrew D Lyons | Digital Artist | http://www.tstex.com
>>>>>> =======================================
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> =======================================
>>>>> Andrew D Lyons | Digital Artist | http://www.tstex.com
>>>>> =======================================
>>>>> _______________________________________________
>>>>> Sidefx-houdini-list mailing list
>>>>> Sidefx-houdini-list at sidefx.com
>>>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> www.dougstruthers.com
>>>> _______________________________________________
>>>> 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
>>>
>>
>>
>>
>> --
>> =======================================
>> Andrew D Lyons | Digital Artist | http://www.tstex.com
>> =======================================
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>
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