[Sidefx-houdini-list] PC cache from Mantra into SOP space?

Peter Bowmar pbowmar at gmail.com
Wed Aug 20 00:22:44 EDT 2008

Hi Jason,

Yep, this works great for pcwrite() to get it into Houdini. However,
when I try to use pcopen using:

Pin = ptransform("space:world","space:camera",P);

then a pcfilter() it doesn't work, I just get black back.

If I remove both transforms (out and in) then it works fine. This is
what I faced before, and why I ultimately took off the xforms,
sacrificing the ability to load the .pc correctly into Houdini for the
Mantra render turning out correctly.

I'll post an example on Odforce at some point, perhaps I'm thinking
about the Pin wrong...


Peter B

2008/8/18 jiversen <jiversen at rhythm.com>:
> Hey Peter,
> I've found that if you write your point cloud in world space, it behaves
> as expected when I import it into SOPs.
> ...
> Pout = ptransform("space:camera","space:world", P);
> Nout = ntransform("space:camera","space:world", nN);
> rval = pcwrite(fname, "interpolate", 1,
>                           "P", Pout,
>                           "N:vector", Nout,
>                            attrname, attrval     );
> ...
> Mario Marengo wrote:
>> On Saturday 16 August 2008 11:33:36 pm Peter Bowmar wrote:
>>> Hi,
>>> So, trying to load in a PC file written from a pcwrite() in mantra, into
>>> SOPs.
>>> It all works except it's in the wrong space :(
>> Hey Peter,
>> Hard to tell what might be going on without knowing the transformations used
>> when writing out the cloud...
>> I just did a quick test writing with both camera->world and camera->object and
>> reading back into both an unparented object and one parented to the camera
>> respectively, and it all seems to line up.
>> Why do you need the optransform() again? (remember that a camera->object
>> transform at the pcwrite() call should give you this implicitly -- basically
>> saying "put it where it came from"... unless I'm misinterpreting what you
>> wrote).
> --
> jason iversen
>  fx supervisor
>    r+h
>  is this awesome? (y/n)
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