[Q&A] Finding all unused points (HDK)

published by Houdini on Tue, 02/09/2010 - 23:23

What would be the most efficient way to find all the unused points in the
gdp (using the hdk)? By unused, I mean points that are not used in any
primitive.

I know I can loop through them all and check to see if they are used, but
there must be a more efficient way.

Thanks,
Dave

In GB_Detail there are some various methods to remoe unused points.

00134     //  Remove any unused points, and zero area polygons, zero volume
00135     //  spheres etc.
00136     //  If a primitive group is specified, then only primitives in that
00137     //  group are checked for degeneracy.

<snip>
00147     int          removeUnusedPoints(const GB_PointGroup
<http://www.sidefx.com/docs/hdk10.0/class_g_b___point_group.html>
*ptgrp = 0);

 

 

On Sat, Jan 30, 2010 at 5:02 PM, David Johnson <daveinengland@gmail.com>wrote:

- Show quoted text -

> What would be the most efficient way to find all the unused points in the
> gdp (using the hdk)? By unused, I mean points that are not used in any
> primitive.
>
> I know I can loop through them all and check to see if they are used, but
> there must be a more efficient way.
>
> Thanks,
> Dave
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list@sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>
_______________________________________________
Sidefx-houdini-list mailing list
Sidefx-houdini-list@sidefx.com
https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list

 Reply Forward Invite Jim Price to chat

 Reply |David Johnson to sidefx-houdini.
show details Feb 2 (8 days ago)

Thanks Jim,

I saw that one and have used it, but I was actually trying to find all the
points that weren't being used (i.e. the ones that would be deleted by this
function) so that I could process only them. I think I have a way to
maintain an "unused list", but it's bookkeeping and that always messes me
up.  :)

Dave

- Show quoted text -

On Mon, Feb 1, 2010 at 10:37 PM, Jim Price <shadeops@gmail.com> wrote:

> In GB_Detail there are some various methods to remoe unused points.
>
> 00134     //  Remove any unused points, and zero area polygons, zero volume
> 00135     //  spheres etc.
> 00136     //  If a primitive group is specified, then only primitives in
> that
> 00137     //  group are checked for degeneracy.
>
> <snip>
> 00147     int          removeUnusedPoints(const GB_PointGroup
> <http://www.sidefx.com/docs/hdk10.0/class_g_b___point_group.html>
> *ptgrp = 0);
>
>
>
>
>
> On Sat, Jan 30, 2010 at 5:02 PM, David Johnson <daveinengland@gmail.com
> >wrote:
>
> > What would be the most efficient way to find all the unused points in the
> > gdp (using the hdk)? By unused, I mean points that are not used in any
> > primitive.
> >
> > I know I can loop through them all and check to see if they are used, but
> > there must be a more efficient way.
> >
> > Thanks,
> > Dave
> > _______________________________________________
> > Sidefx-houdini-list mailing list
> > Sidefx-houdini-list@sidefx.com
> > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> >
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list@sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>
_______________________________________________
Sidefx-houdini-list mailing list
Sidefx-houdini-list@sidefx.com
https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list

 Reply Forward Invite David Johnson to chat

 Reply |Jim Price to sidefx-houdini.
show details Feb 2 (7 days ago)

Opps, my apologies.  Yea, aside from looping through each point and testing
with isPointUsed(...), I can't think of anything.

On Tue, Feb 2, 2010 at 2:10 AM, David Johnson <daveinengland@gmail.com>wrote:

> Thanks Jim,
>
> I saw that one and have used it, but I was actually trying to find all the
> points that weren't being used (i.e. the ones that would be deleted by this
> function) so that I could process only them. I think I have a way to
> maintain an "unused list", but it's bookkeeping and that always messes me
> up.  :)
>
> Dave
>
> On Mon, Feb 1, 2010 at 10:37 PM, Jim Price <shadeops@gmail.com> wrote:
>
> > In GB_Detail there are some various methods to remoe unused points.
> >
> > 00134     //  Remove any unused points, and zero area polygons, zero
> volume
> > 00135     //  spheres etc.
> > 00136     //  If a primitive group is specified, then only primitives in
> > that
> > 00137     //  group are checked for degeneracy.
> >
> > <snip>
> > 00147     int          removeUnusedPoints(const GB_PointGroup
> > <http://www.sidefx.com/docs/hdk10.0/class_g_b___point_group.html>
> > *ptgrp = 0);
> >
>

- Show quoted text -

Forums: