[Sidefx-houdini-list] vops and point clouds

Olex P hoknamahn at gmail.com
Thu Aug 20 08:52:36 EDT 2009


Well it was mistake that order doesn't matter. Discs should be "sorted" :)
But we did it in previous versions so shouldn't be a problem to add sort
again.

On Thu, Aug 20, 2009 at 12:56 PM, Olex P <hoknamahn at gmail.com> wrote:

> 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