[Sidefx-houdini-list] vops and point clouds

Olex P hoknamahn at gmail.com
Thu Aug 20 07:56:43 EDT 2009


Oops sorry that was a user mistake again. This is what you probably want
http://www.hotmail.ru/download.php/?file=:pcdvd3.hip&host=alex-hawk.hotmail.ru/flashcard&user=alex-hawk&lng=ru


On Thu, Aug 20, 2009 at 12:48 PM, Olex P <hoknamahn at gmail.com> wrote:

> Humm, I made a test but for some reason I see the clipping that you have on
> your screenshot. The rest seems to be fine.
> Have to check what exactly causes that clipping.
>
>
> On Thu, Aug 20, 2009 at 12:33 PM, Olex P <hoknamahn at gmail.com> wrote:
>
>> Hi Nicholas,
>>
>> I believe all what you need is just go through all the points in radius
>> and sum all the values of alpha on them. The order doesn't really matter.
>>
>>
>> On Thu, Aug 20, 2009 at 11:54 AM, Nicholas Pliatsikas <
>> nick_p102 at hotmail.com> wrote:
>>
>>>
>>> Didnt realise the refract limits would affect the point cloud data. I
>>> will check into that.
>>>
>>> I had a good think about what was causing the problems last night, I
>>> think its due to how a random ID variable is working in relation to the
>>> order in which the point cloud data is being seached.
>>>
>>> For example if the current points random ID value is bigger then the
>>> random ID value of the next point it will be ignored, that point will be
>>> ignored. I guess what is really needed is some way of sorting the point
>>> datas random ID values then bring those in sequential. But I have a feeling
>>> thats not possible at all. So im trying another approach, and changing the
>>> order of where the random call is happening, i.e clipping it with the alpha
>>> map then running the if statement to check what the highest visible layer
>>> is.
>>>
>>> This is much tricker then i first thought..
>>>
>>> Cheers
>>> Nick
>>>
>>> > Date: Wed, 19 Aug 2009 09:40:51 -0700
>>> > From: daveinengland at gmail.com
>>> > To: sidefx-houdini-list at sidefx.com
>>> > Subject: Re: [Sidefx-houdini-list] vops and point clouds
>>> >
>>> > I can't get to the files you referenced because of our firewall, but
>>> have
>>> > you checked the refract limit on your objects? If this is too low, the
>>> rays
>>> > will be limited by this. Also, there is the opacity limit in the ROP
>>> may be
>>> > limiting your rays.
>>> >
>>> > Just a thought.
>>> >
>>> > Dave
>>> >
>>> > On Wed, Aug 19, 2009 at 2:25 AM, Nicholas Pliatsikas
>>> > <nick_p102 at hotmail.com>wrote:
>>> >
>>> > >
>>> > > Hey guys and gals.
>>> > >
>>> > > After doing a good bit of work on the point cloud shader ive hit a
>>> problem.
>>> > > To me it seems that there is some optimisations happening with the
>>> point
>>> > > cloud data or its just a bug with code/mantra .
>>> > >
>>> > > Basically when layering the point cloud circles it looks as if mantra
>>> is
>>> > > cutting out much of the underlying circles, creating a problem when
>>> layering
>>> > > images using alphas. i.e parts of the underlying images are cut off.
>>> > >
>>> > > I can't see a problem with the code i added, so I went back to the
>>> example
>>> > > Olex sent me and changed it to be additive. This illustrated the same
>>> issue.
>>> > > You can see a screen grab here
>>> > >
>>> > >
>>> https://rcpt.yousendit.com/727895459/45f82a647fbe6eae52df9dc836f604f3
>>> > >
>>> > > If it is a bug/limit with mantra I wills end this off to sidefx
>>> support.
>>> > >
>>> > > I have also saved out the additive version of the hipfile, you can
>>> download
>>> > > it here.
>>> > >
>>> > >
>>> https://rcpt.yousendit.com/727894133/de680b2c71c2c8d61f6dc0700d9d57a4
>>> > >
>>> > > I hope this is something we can get around as it will be a really
>>> nice way
>>> > > to add controlled details to scene. Just a note it also seems as if
>>> there is
>>> > > the odd point radius that isnt being added correctly either (the
>>> green
>>> > > circles at the bottom right of the screen for example)
>>> > >
>>> > > Cheers
>>> > > Nick
>>> > >
>>> > > > From: nick_p102 at hotmail.com
>>> > > > To: sidefx-houdini-list at sidefx.com
>>> > > > Date: Fri, 14 Aug 2009 15:55:02 +0000
>>> > > > Subject: Re: [Sidefx-houdini-list] vops and point clouds
>>> > > >
>>> > > >
>>> > > > Thanks for that Olex :) thats a great example, I see what you where
>>> > > meaning in your code about using the maxheight random calls. Just
>>> trying
>>> > > this out in vops, having some oddities but will try a few more times
>>> until i
>>> > > resort to vex coding ;¬) as i need to quite abit inside that loop.
>>> > > >
>>> > > > Cheers mucho!!!
>>> > > > Nick
>>> > > >
>>> > > >
>>> > > >
>>> > > > > Date: Fri, 14 Aug 2009 13:46:49 +0100
>>> > > > > From: hoknamahn at gmail.com
>>> > > > > To: sidefx-houdini-list at sidefx.com
>>> > > > > Subject: Re: [Sidefx-houdini-list] vops and point clouds
>>> > > > >
>>> > > > > Oops, that was toooo quick test. There is correct one
>>> > > > >
>>> > > > >
>>> > >
>>> http://www.hotmail.ru/download.php/?file=:pcdvd2.hip&host=alex-hawk.hotmail.ru/flashcard&user=alex-hawk&lng=ru
>>> > > > >
>>> > > > > On Fri, Aug 14, 2009 at 1:33 PM, Olex P <hoknamahn at gmail.com>
>>> wrote:
>>> > > > >
>>> > > > > > Hey,
>>> > > > > >
>>> > > > > > There is a quick example
>>> > > > > >
>>> > > > > >
>>> > > > > >
>>> > >
>>> http://www.hotmail.ru/download.php/?file=:pcdvd.hip&host=alex-hawk.hotmail.ru/flashcard&user=alex-hawk&lng=ru
>>> > > > > >
>>> > > > > > AA isn't included! :p
>>> > > > > >
>>> > > > > >
>>> > > > > > On Fri, Aug 14, 2009 at 12:24 PM, <eetu at iki.fi> wrote:
>>> > > > > >
>>> > > > > >> >> >> Hey Peoples
>>> > > > > >> >> >>
>>> > > > > >> >> >> Im currently working on an image bombing point cloud
>>> shader
>>> > > and hit
>>> > > > > >> a
>>> > > > > >> >> >> problem i dont quite understand how to solve.
>>> > > > > >>
>>> > > > > >> Here's a thread from Georg which might well be relevant for
>>> you
>>> > > > > >>
>>> > > > > >>
>>> > > > > >>
>>> > >
>>> http://forums.odforce.net/index.php?/topic/6967-a-shader-each-day/page__view__findpost__p__47148
>>> > > > > >>
>>> > > > > >> I vaguely remember another forum thread with someone battling
>>> with
>>> > > the
>>> > > > > >> same problem, but can't find it now for the life of me. I
>>> think it
>>> > > was
>>> > > > > >> about overlapping fakeshadow blobs, if you happen to be able
>>> to find
>>> > > it :)
>>> > > > > >>
>>> > > > > >> eetu.
>>> > > > > >>
>>> > > > > >>
>>> > > > > >> _______________________________________________
>>> > > > > >> 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
>>> > > >
>>> > > > _________________________________________________________________
>>> > > > Celebrate a decade of Messenger with free winks, emoticons, display
>>> pics,
>>> > > and more.
>>> > > > http://clk.atdmt.com/UKM/go/157562755/direct/01/
>>> > > > _______________________________________________
>>> > > > Sidefx-houdini-list mailing list
>>> > > > Sidefx-houdini-list at sidefx.com
>>> > > > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>> > >
>>> > > _________________________________________________________________
>>> > > Windows Live Messenger: Celebrate 10 amazing years with free winks
>>> and
>>> > > emoticons.
>>> > > http://clk.atdmt.com/UKM/go/157562755/direct/01/
>>> > > _______________________________________________
>>> > > 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
>>>
>>> _________________________________________________________________
>>> Windows Live Messenger: Celebrate 10 amazing years with free winks and
>>> emoticons.
>>> http://clk.atdmt.com/UKM/go/157562755/direct/01/
>>> _______________________________________________
>>> Sidefx-houdini-list mailing list
>>> Sidefx-houdini-list at sidefx.com
>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>
>>
>>
>



More information about the Sidefx-houdini-list mailing list