[Sidefx-houdini-list] Bridge of Cards

pingo van der brinkloev houdinilist at comxnet.dk
Mon Mar 17 14:26:04 EDT 2008


ack

what a silly thing to miss.

moving on

pingo

On 17/03/2008, at 19.12, Peter Robbinson wrote:

> The Details view is set to show "point" information by default. You  
> can
> change the type of info. to view on the right side
> of the Details view.
>
> PeterR
>
> 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
>>>
>> _______________________________________________
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>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>
>>
>
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