[Sidefx-houdini-list] Bridge of Cards

Antoine Durr antoine at floqfx.com
Mon Mar 17 14:21:04 EDT 2008


On Mar 17, 2008, at 11:05 AM, pingo van der brinkloev wrote:

> it works??? ok now I'm baffled. Is there anyway You could send me a
> file? or have a look at one from me?
>
> Geometry spreadsheet? this is the details pane, right?

just mouse-right on the SOP tile, and select 'Spreadsheet...'

-- Antoine

>
> cheers!
>
> pingo
>
> On 17/03/2008, at 19.01, Antoine Durr wrote:
>
>> Hmm, I tried it, and it worked just fine.  Are you sure you're
>> looking at the primitive attributes and not the point attributes in
>> the geometry spreadsheet?
>>
>> -- Antoine
>>
>> On Mar 17, 2008, at 10:36 AM, pingo van der brinkloev wrote:
>>
>>> Hey Antoine.
>>> It all makes sense (points are points, etc) and It certainly should
>>> work the way you describe, but it just doesn't. not with `$PR`
>>> either.
>>> A shame you don't have a houdini in front of you cause I would  
>>> really
>>> like to have someone confirm this.
>>>
>>> I am using a standard grid with nothing changed. It's got 81
>>> Primitives. (100 points)
>>>
>>> On the attribCreate with Class as Primitive, Type as String and $PR
>>> in
>>> String the attributes dissapear from the details view
>>>
>>> very odd.
>>>
>>> Cheers!
>>>
>>> pingo
>>>
>>>
>>> On 17/03/2008, at 18.03, Antoine Durr wrote:
>>>
>>>> If you're making an attribute of class 'point', then no, you don't
>>>> have access to $PR, as $PR is the *primitive* number (which you
>>>> don't
>>>> "know" about when looping through the points list).  Likewise, you
>>>> can use $PT in the points context, but not the primitive context.
>>>> The only example below that might work is the class=prim,
>>>> type=string, string=$PR example.  Mouse-middle on the SOP above the
>>>> attribcreate: how many primitives do you have?  If you have a NURBs
>>>> patch, then yeah, I would expect only one primitive, number zero.
>>>> If
>>>> you have 100 polys, then $PR *should* go from 0 to 99.  You may  
>>>> need
>>>> to backtick the $PR (`$PR`) when making a string (don't have  
>>>> Houdini
>>>> in front of me, so I can't test).
>>>>
>>>> -- Antoine
>>>>
>>>> On Mar 17, 2008, at 9:21 AM, pingo van der brinkloev wrote:
>>>>
>>>>> Hey Antoine. I might be doing something wrong, but I can't get the
>>>>> AttribCreate to use the $PR in he string
>>>>>
>>>>> this works
>>>>>
>>>>> I make a grid
>>>>> connect it to an AttribCreate
>>>>> 	Class = Point
>>>>> 	Type = String
>>>>> 	.
>>>>> 	.
>>>>> 	.
>>>>> 	String = $PT
>>>>>
>>>>> If I look in the details view I can see my attribute1 changing
>>>>> numbers
>>>>> along with the point number.
>>>>>
>>>>> but...
>>>>>
>>>>> Changing things in the attribcreate doesn't work as I would
>>>>> expect...
>>>>>
>>>>> 	Class = Primitive
>>>>> 	Type = String
>>>>> 	.
>>>>> 	.
>>>>> 	.
>>>>> 	String = $PT
>>>>>
>>>>> Attributes dissapear
>>>>>
>>>>> 	Class = Primitive
>>>>> 	Type = String
>>>>> 	.
>>>>> 	.
>>>>> 	.
>>>>> 	String = $PR
>>>>>
>>>>> Attributes dissapear
>>>>>
>>>>> 	Class = Points
>>>>> 	Type = String
>>>>> 	.
>>>>> 	.
>>>>> 	.
>>>>> 	String = $PR
>>>>>
>>>>> Attributes reapear but are all = 0 (zero)
>>>>>
>>>>> Is this supposed to happen??
>>>>>
>>>>> thanks for your time!
>>>>>
>>>>> pingo
>>>>>
>>>>> On 17/03/2008, at 16.03, Antoine Durr wrote:
>>>>>
>>>>>>
>>>>>> On Mar 17, 2008, at 7:40 AM, pingo van der brinkloev wrote:
>>>>>>
>>>>>>> Hello Antoine. I've been following this thread with great
>>>>>>> interest.
>>>>>>> Could this technique be used to create a grid with an (adjacent
>>>>>>> numbered) image on each face?
>>>>>>>
>>>>>>> what would be the shortest steps to produce that?
>>>>>>
>>>>>> Sure, that's easy!  Just an attribcreate SOP again using $PR  
>>>>>> in an
>>>>>> expression (but again, you first need to find out what the
>>>>>> parameter
>>>>>> is on the *shader* that will take the unique named map (often
>>>>>> called
>>>>>> 'map', but not always).
>>>>>>
>>>>>> -- Antoine
>>>>>>
>>>>>>>
>>>>>>> regards
>>>>>>>
>>>>>>> pingo
>>>>>>>
>>>>>>> On 16/03/2008, at 11.12, Antoine Durr wrote:
>>>>>>>
>>>>>>>> Wow, 87,000 polygons for a single card?  That'll slow you
>>>>>>>> down!  I
>>>>>>>> would expect a playing card to be in the hundreds of polys at
>>>>>>>> most,
>>>>>>>> not tens of thousands!   I'd start out by temporarily replacing
>>>>>>>> the
>>>>>>>> card geometry with a simple rectangle -- one polygon (a.k.a.
>>>>>>>> primitive), then see if the $PR in attribcreate works.
>>>>>>>>
>>>>>>>> Yeah, with multiple primitives per card, you'll get each
>>>>>>>> subsequent
>>>>>>>> card on adjacent primitives -- definitely not what you want.
>>>>>>>> You'll
>>>>>>>> need to isolate the face of the card into one SOP,  and
>>>>>>>> everything
>>>>>>>> else as another SOP.
>>>>>>>>
>>>>>>>> The randomization is in the expression you use to set the map
>>>>>>>> attribute.  I gave a simple example -- card.$PR.jpg.  What
>>>>>>>> you're
>>>>>>>> more likely to need is
>>>>>>>>
>>>>>>>> card.`int(rand($PR)*$NPR)`.jpg
>>>>>>>>
>>>>>>>> though I prefer to use fit() to have deliberate control over  
>>>>>>>> the
>>>>>>>> output range (1 to $NPR in this case)
>>>>>>>>
>>>>>>>> card.`int(fit(rand($PR), 0, 1, 1, $NPR))`.jpg
>>>>>>>>
>>>>>>>> Again, check here with the geometry spreadsheet that your
>>>>>>>> assignments
>>>>>>>> worked out as planned.  Then it's a matter of copying both the
>>>>>>>> face
>>>>>>>> polys and the non-face polys to the points (via the copy SOP,
>>>>>>>> as I
>>>>>>>> assume you're doing).
>>>>>>>>
>>>>>>>> Actually, now that I think about it, you probably want to apply
>>>>>>>> the
>>>>>>>> attribcreate to the *points* onto which you will copy the  
>>>>>>>> cards,
>>>>>>>> first.  Still separate and do two copies, one for the faces,  
>>>>>>>> one
>>>>>>>> for
>>>>>>>> everything else.  On the copy SOP operation with the faces, you
>>>>>>>> can
>>>>>>>> have the single face polygon inherit the attributes from the
>>>>>>>> points.
>>>>>>>>
>>>>>>>> -- Antoine
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mar 16, 2008, at 2:33 AM, Chandra Maharzan wrote:
>>>>>>>>
>>>>>>>>> I have copied over 1 card. It just say 87000 Primitives when I
>>>>>>>>> middle mouse
>>>>>>>>> click on the attribcreate SOP. It also says 1 Primitive
>>>>>>>>> Attribute
>>>>>>>>> and card
>>>>>>>>> -> card.01.jpg. So I am guessing it is only taking 1
>>>>>>>>> primitive to
>>>>>>>>> replicate
>>>>>>>>
>>>>>>>>> just one texture for all the cards. Isn't there a way to  
>>>>>>>>> assign
>>>>>>>>> each of the
>>>>>>>>> copied primitives to take random textures? I am a newbie and
>>>>>>>>> I am
>>>>>>>>> not so
>>>>>>>>> sure of what you are trying to explain to me.
>>>>>>>>>
>>>>>>>>> Thanks and let me know if there is a way to figure it out.
>>>>>>>>>
>>>>>>>>> Chandra
>>>>>>>>>
>>>>>>>>> -----Original Message-----
>>>>>>>>> From: sidefx-houdini-list-bounces at sidefx.com
>>>>>>>>> [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of
>>>>>>>>> Antoine Durr
>>>>>>>>> Sent: Sunday, March 16, 2008 2:37 PM
>>>>>>>>> To: sidefx-houdini-list at sidefx.com
>>>>>>>>> Subject: Re: [Sidefx-houdini-list] Bridge of Cards
>>>>>>>>>
>>>>>>>>> The attribute type has to match the type of the parameter of
>>>>>>>>> the
>>>>>>>>> shader.  Typically, the 'map' parameter is a *string*
>>>>>>>>> parameter.
>>>>>>>>> In
>>>>>>>>> the attribcreate, you'll proabably use something like card.
>>>>>>>>> $PR.jpg
>>>>>>>>> (i.e. one map per primitive).  Whether the attribcreate is
>>>>>>>>> before
>>>>>>>>> or
>>>>>>>>> after the material SOP doesn't matter so much, as both of them
>>>>>>>>> just
>>>>>>>>> add *attributes* to the geometry.  Use mouse-middle on the
>>>>>>>>> SOP or
>>>>>>>>> the
>>>>>>>>> geometry spreadsheet to see what attribs are ultimately there
>>>>>>>>> (especially of the SOP that is used to render).
>>>>>>>>>
>>>>>>>>> -- Antoine
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Mar 16, 2008, at 1:08 AM, Chandra Maharzan wrote:
>>>>>>>>>
>>>>>>>>>> This is quite unclear to me. I created the attribcreate SOP
>>>>>>>>>> infront
>>>>>>>>>> of the
>>>>>>>>>> material SOP and gave the name card (as the cards are named
>>>>>>>>>> card.
>>>>>>>>>> 01.jpg,
>>>>>>>>>> etc) and then type=float size 3 or 2.. but it didn't work
>>>>>>>>>> properly.
>>>>>>>>>> I have
>>>>>>>>>> the Texture map set to .../card.$F2.jpg
>>>>>>>>>>
>>>>>>>>>> What am I doing wrong here or missing?
>>>>>>>>>>
>>>>>>>>>> Thanks,
>>>>>>>>>> Chandra
>>>>>>>>>>
>>>>>>>>>> -----Original Message-----
>>>>>>>>>> From: sidefx-houdini-list-bounces at sidefx.com
>>>>>>>>>> [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of
>>>>>>>>>> Antoine Durr
>>>>>>>>>> Sent: Saturday, March 15, 2008 2:29 AM
>>>>>>>>>> To: sidefx-houdini-list at sidefx.com
>>>>>>>>>> Subject: Re: [Sidefx-houdini-list] Bridge of Cards
>>>>>>>>>>
>>>>>>>>>> Look at the shader that you're using.  Is there a field for
>>>>>>>>>> map
>>>>>>>>>> name?  If so, make an attribute on your geometry with the  
>>>>>>>>>> same
>>>>>>>>>> name
>>>>>>>>>> and type (using attribcreate SOP), set each name randomly
>>>>>>>>>> (have
>>>>>>>>>> names
>>>>>>>>>> like card.0001.jpg, card.0002.jpg, and so on to make it
>>>>>>>>>> easier).
>>>>>>>>>> Now
>>>>>>>>>> rerender, and each card should be  unique.
>>>>>>>>>>
>>>>>>>>>> -- Antoine
>>>>>>>>>>
>>>>>>>>>> On Mar 14, 2008, at 1:01 PM, Chandra Maharzan wrote:
>>>>>>>>>>
>>>>>>>>>>> How can we assign random textures ? That might be a good
>>>>>>>>>>> trick so
>>>>>>>>>>> we can get
>>>>>>>>>>> all the cards.. :)
>>>>>>>>>>>
>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>> From: sidefx-houdini-list-bounces at sidefx.com
>>>>>>>>>>> [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of
>>>>>>>>>>> Jerry
>>>>>>>>>>> Corda-Stanley
>>>>>>>>>>> Sent: Saturday, March 15, 2008 1:24 AM
>>>>>>>>>>> To: sidefx-houdini-list at sidefx.com
>>>>>>>>>>> Subject: Re: [Sidefx-houdini-list] Bridge of Cards
>>>>>>>>>>>
>>>>>>>>>>> That's some pack of cards. All aces!
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> ----- "Chandra Maharzan" <chandra at digital.com.np> wrote:
>>>>>>>>>>>> Hi Guys,
>>>>>>>>>>>>
>>>>>>>>>>>> By the way, if you were wondering what I was upto and
>>>>>>>>>>>> sending
>>>>>>>>>>>> all
>>>>>>>>>>>> those
>>>>>>>>>>>> newbie questions, here is what I made. :)
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>> http://bp0.blogger.com/_ZoZUTKmj098/R9rCJ6QlbiI/AAAAAAAAADM/
>>>>>>>>>>> Y8mervJCHMo/s160
>>>>>>>>>>>> 0-h/bridge-full.jpg
>>>>>>>>>>>>
>>>>>>>>>>>> Hope you like it. (My blog - http://
>>>>>>>>>>>> learninghoudini.blogspot.com/)
>>>>>>>>>>>>
>>>>>>>>>>>> Thank you all for your prompt replies and I am looking
>>>>>>>>>>>> forward
>>>>>>>>>>>> to
>>>>>>>>>>>> learning
>>>>>>>>>>>> more of Houdini in coming days.
>>>>>>>>>>>>
>>>>>>>>>>>> Regards,
>>>>>>>>>>>> Chandra
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> 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
>>>>>>>>>>
>>>>>>>>>> -- Antoine
>>>>>>>>>>
>>>>>>>>>> Floq FX Inc.
>>>>>>>>>> 10659 Cranks Rd.
>>>>>>>>>> Culver City, CA 90230
>>>>>>>>>> 310/430-2473
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> 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
>>>>>>>>>
>>>>>>>>> -- Antoine
>>>>>>>>>
>>>>>>>>> Floq FX Inc.
>>>>>>>>> 10659 Cranks Rd.
>>>>>>>>> Culver City, CA 90230
>>>>>>>>> 310/430-2473
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> 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
>>>>>>>>
>>>>>>>> -- Antoine
>>>>>>>>
>>>>>>>> Floq FX Inc.
>>>>>>>> 10659 Cranks Rd.
>>>>>>>> Culver City, CA 90230
>>>>>>>> 310/430-2473
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> 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
>>>>>>
>>>>>> -- Antoine
>>>>>>
>>>>>> Floq FX Inc.
>>>>>> 10659 Cranks Rd.
>>>>>> Culver City, CA 90230
>>>>>> 310/430-2473
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> 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
>>>>
>>>> -- Antoine
>>>>
>>>> Floq FX Inc.
>>>> 10659 Cranks Rd.
>>>> Culver City, CA 90230
>>>> 310/430-2473
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> 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
>>
>> -- Antoine
>>
>> Floq FX Inc.
>> 10659 Cranks Rd.
>> Culver City, CA 90230
>> 310/430-2473
>>
>>
>>
>>
>> _______________________________________________
>> 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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-- Antoine

Floq FX Inc.
10659 Cranks Rd.
Culver City, CA 90230
310/430-2473







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