Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Ok, I misinterpreted your previous post. AFAIR you can set a pivot-point for
the PAT. (at least for the osgSim::DoFTransfrom).
If I’m mistaken, you need to put a transform in your change yourself.
hth
Sebastian
From: osg-users On Behalf Of
OpenSceneGraph Users
Sent: Samstag, 18. April 2020 17:06
To: OpenSceneGraph Users
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian
I'll experiment with removing the original group.
The original model structure doesn't include any transforms. So the structure I
am looking at right now is:
Group "Heli" -> MyNewPAT -> Group "Main_Hub" -> Geometry1 ... GeometryN
If the MyNewPAT either child or parent was an object that contain the
appropriate information such as pivot I could definitely extract that info and
apply it to the PAT, but unfortunately it's surrounded by Groups.
Maybe I could create both a transform and a PAT, but I would still need some of
that basic information to set its reference points.
I've attached an osgt example.
Thanks
Jeremy
On Saturday, April 18, 2020 at 6:53:10 AM UTC-4, OpenSceneGraph Users wrote:
Hi,
you’re on the right track. Issue 1 stems from the fact, that you are not
removing the original group or at least the childs you’re re-parenting (which
still has references to your nodes).
Concerning issue 2. If the parent is a transform, you obviously need to take
this into account. PAT has a setPivotPoint IIRC, but another option is to
structure your scenegraph as follows:
Group -> OrginalTransform/Parent -> YourNewPAT -> Geometry1 … GeometryN
So leave the transform an put your PAT inbetween. That should solve the offset.
If you’re still struggling with this, maybe supply a minimal osgt.
Cheers
Sebastian
From: osg-users > On Behalf
Of OpenSceneGraph Users
Sent: Samstag, 18. April 2020 01:38
To: OpenSceneGraph Users >
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian
Thank you for your patience and guidance. Programmatically definitely makes
sense and I did look into that a short while back. I was initially looking at
PositionAttitudeTransform. Now revisiting that approach, I understand why I
started to look in another direction. Here is the dilemma I've come across. All
is good until I try to assign a parent to the Transform
hive::display::FindNamedNodeVisitor fnnv("Main_Hub");
scene->accept(fnnv);
osg::ref_ptr autoTrans = new osg::
PositionAttitudeTransform();
//puts node and all children under transform
autoTrans->addChild(fnnv.getFoundNode());
//set the parent (this doesn’t seem completely right to me, but may be)
fnnv.getFoundNode()->getParent(0)->addChild(autoTrans);
issue 1) at this point it appears to create a duplicate object (node and
children) of the “Main_Hub” group;
issue 2) when I attempt rotation of the object it seems to be around the origin
of the model instead of the previous “pivot pilot”
I seem to be missing how to squeeze that transform between the parent and child
appropriately.
Jeremy
On Thursday, April 16, 2020 at 9:41:55 AM UTC-4, OpenSceneGraph Users wrote:
Hi Jeremy,
Yes programmatically. You simply create a Transform, DOFTransform, whatever
and set all the children of the original Group as childs of the new one
(transforms, as you surely know are groups too).
Lastly you want to want to set the parent as well. I haven’t used OSG in a
while, but this pattern for sure works.
If you have more questions fell free to ask.
Cheers
Sebastian
From: osg-users mailto:osg-user...@lists.openscenegraph.org> > On Behalf Of OpenSceneGraph
Users
Sent: Donnerstag, 16. April 2020 14:36
To: OpenSceneGraph Users mailto:osg-...@googlegroups.com> >
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian, I've used the nodevisitor to find the node by name, the node just
happens to be a osg::group. Could you explain what you mean by "replace them
with a DOF-Transform"? I'm optimistic that you mean programmatically. My
current approach is to replace it manually in the osgt file.
Thanks
Jeremy
On Thursday, April 16, 2020 at 7:14:18 AM UTC-4, OpenSceneGraph Users wrote:
Hi Jeremy,
As your geometry-parts are usually under a transform /group you can use a
NodeVisitor to collect those (Find the nodes by name) and replace them with a
DOF-Transform.
You could of course also mess with the osgt-files, but that would be a last
resort.
Cheers
Sebastian
From: osg-users mailto:osg-user...@lists.openscenegraph.org> > On Behalf Of OpenSceneGraph
Users
Sent: Mittwoch, 15. April 2020 21:54
To: OpenSceneGraph Users mailto:osg-...@googlegroups.com> >
Subject: [osg-users] Edit 3D (osgt) mode
Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Hi,
you’re on the right track. Issue 1 stems from the fact, that you are not
removing the original group or at least the childs you’re re-parenting (which
still has references to your nodes).
Concerning issue 2. If the parent is a transform, you obviously need to take
this into account. PAT has a setPivotPoint IIRC, but another option is to
structure your scenegraph as follows:
Group -> OrginalTransform/Parent -> YourNewPAT -> Geometry1 … GeometryN
So leave the transform an put your PAT inbetween. That should solve the offset.
If you’re still struggeling with this, maybe supply a minimal osgt.
Cheers
Sebastian
From: osg-users On Behalf Of
OpenSceneGraph Users
Sent: Samstag, 18. April 2020 01:38
To: OpenSceneGraph Users
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian
Thank you for your patience and guidance. Programmatically definitely makes
sense and I did look into that a short while back. I was initially looking at
PositionAttitudeTransform. Now revisiting that approach, I understand why I
started to look in another direction. Here is the dilemma I've come across. All
is good until I try to assign a parent to the Transform
hive::display::FindNamedNodeVisitor fnnv("Main_Hub");
scene->accept(fnnv);
osg::ref_ptr autoTrans = new osg::
PositionAttitudeTransform();
//puts node and all children under transform
autoTrans->addChild(fnnv.getFoundNode());
//set the parent (this doesn’t seem completely right to me, but may be)
fnnv.getFoundNode()->getParent(0)->addChild(autoTrans);
issue 1) at this point it appears to create a duplicate object (node and
children) of the “Main_Hub” group;
issue 2) when I attempt rotation of the object it seems to be around the origin
of the model instead of the previous “pivot pilot”
I seem to be missing how to squeeze that transform between the parent and child
appropriately.
Jeremy
On Thursday, April 16, 2020 at 9:41:55 AM UTC-4, OpenSceneGraph Users wrote:
Hi Jeremy,
Yes programmatically. You simply create a Transform, DOFTransform, whatever
and set all the children of the original Group as childs of the new one
(transforms, as you surely know are groups too).
Lastly you want to want to set the parent as well. I haven’t used OSG in a
while, but this pattern for sure works.
If you have more questions fell free to ask.
Cheers
Sebastian
From: osg-users > On Behalf
Of OpenSceneGraph Users
Sent: Donnerstag, 16. April 2020 14:36
To: OpenSceneGraph Users >
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian, I've used the nodevisitor to find the node by name, the node just
happens to be a osg::group. Could you explain what you mean by "replace them
with a DOF-Transform"? I'm optimistic that you mean programmatically. My
current approach is to replace it manually in the osgt file.
Thanks
Jeremy
On Thursday, April 16, 2020 at 7:14:18 AM UTC-4, OpenSceneGraph Users wrote:
Hi Jeremy,
As your geometry-parts are usually under a transform /group you can use a
NodeVisitor to collect those (Find the nodes by name) and replace them with a
DOF-Transform.
You could of course also mess with the osgt-files, but that would be a last
resort.
Cheers
Sebastian
From: osg-users mailto:osg-user...@lists.openscenegraph.org> > On Behalf Of OpenSceneGraph
Users
Sent: Mittwoch, 15. April 2020 21:54
To: OpenSceneGraph Users mailto:osg-...@googlegroups.com> >
Subject: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
First off, I hope everyone is staying sane and healthy during this pandemic.
I’m working with a collection of 3D models that have come from a variety of
different source but are now all in osgb format. For several of the models I’d
like to grab a “node” and apply rotation.
As I’m working through my understanding of the approach, I’ve created a simple
application that loads the model, traverses the scene, returns a pointer to the
“node”, casts to a DOFTransform and manipulate the “node” (DOFTransform).
Snippet:
FindNamedNodeVisitor fnnv("turret");
scene->accept(fnnv);
osg::ref_ptr dofTrans = new osgSim::DOFTransform();
dofTrans =
dynamic_cast(fnnv.getFoundNode()->asTransform());
if(dofTrans != NULL)
//manipulate (rotate)
This approach works for the tank.osg model. Now I’m trying to apply this
approach to a different model (helicopter for example). When I access the
“node” of interest, “Main_Hub” which is an osg::Group I obviously can’t cast
that to a osgSim::DOFTransform. I’m trying to get an understand of how I can
change the model, now in osgt (readable) format, to a structure that can be
used. I’ve been using the tank.osg as a guide and attempt
Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Sebastian
Thank you for your patience and guidance. Programmatically definitely makes
sense and I did look into that a short while back. I was initially looking
at PositionAttitudeTransform. Now revisiting that approach, I understand
why I started to look in another direction. Here is the dilemma I've come
across. All is good until I try to assign a parent to the Transform
hive::display::FindNamedNodeVisitor fnnv("Main_Hub");
scene->accept(fnnv);
osg::ref_ptr autoTrans = new osg::
PositionAttitudeTransform();
//puts node and all children under transform
autoTrans->addChild(fnnv.getFoundNode());
//set the parent (this doesn’t seem completely right to me, but may be)
fnnv.getFoundNode()->getParent(0)->addChild(autoTrans);
issue 1) at this point it appears to create a duplicate object (node and
children) of the “Main_Hub” group;
issue 2) when I attempt rotation of the object it seems to be around the
origin of the model instead of the previous “pivot pilot”
I seem to be missing how to squeeze that transform between the parent and
child appropriately.
Jeremy
On Thursday, April 16, 2020 at 9:41:55 AM UTC-4, OpenSceneGraph Users wrote:
>
> Hi Jeremy,
>
>
>
> Yes programmatically. You simply create a Transform, DOFTransform,
> whatever and set all the children of the original Group as childs of the
> new one (transforms, as you surely know are groups too).
>
> Lastly you want to want to set the parent as well. I haven’t used OSG in a
> while, but this pattern for sure works.
>
> If you have more questions fell free to ask.
>
>
>
> Cheers
>
> Sebastian
>
>
>
> *From:* osg-users > *On
> Behalf Of *OpenSceneGraph Users
> *Sent:* Donnerstag, 16. April 2020 14:36
> *To:* OpenSceneGraph Users >
> *Subject:* Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and
> perform "node" rotation
>
>
>
> Sebastian, I've used the nodevisitor to find the node by name, the node
> just happens to be a osg::group. Could you explain what you mean by
> "replace them with a DOF-Transform"? I'm optimistic that you mean
> programmatically. My current approach is to replace it manually in the osgt
> file.
>
>
>
> Thanks
>
> Jeremy
>
> On Thursday, April 16, 2020 at 7:14:18 AM UTC-4, OpenSceneGraph Users
> wrote:
>
> Hi Jeremy,
>
>
>
> As your geometry-parts are usually under a transform /group you can use a
> NodeVisitor to collect those (Find the nodes by name) and replace them with
> a DOF-Transform.
>
> You could of course also mess with the osgt-files, but that would be a
> last resort.
>
>
>
> Cheers
>
> Sebastian
>
>
>
> *From:* osg-users *On Behalf Of
> *OpenSceneGraph
> Users
> *Sent:* Mittwoch, 15. April 2020 21:54
> *To:* OpenSceneGraph Users
> *Subject:* [osg-users] Edit 3D (osgt) model to add DOFTransform and
> perform "node" rotation
>
>
>
> First off, I hope everyone is staying sane and healthy during this
> pandemic.
>
>
>
> I’m working with a collection of 3D models that have come from a variety
> of different source but are now all in osgb format. For several of the
> models I’d like to grab a “node” and apply rotation.
>
>
>
> As I’m working through my understanding of the approach, I’ve created a
> simple application that loads the model, traverses the scene, returns a
> pointer to the “node”, casts to a DOFTransform and manipulate the “node”
> (DOFTransform). Snippet:
>
> FindNamedNodeVisitor fnnv("turret");
>
> scene->accept(fnnv);
>
> osg::ref_ptr dofTrans = new osgSim::DOFTransform();
>
> dofTrans =
> dynamic_cast(fnnv.getFoundNode()->asTransform());
>
> if(dofTrans != NULL)
>
> //manipulate (rotate)
>
>
>
> This approach works for the tank.osg model. Now I’m trying to apply this
> approach to a different model (helicopter for example). When I access the
> “node” of interest, “Main_Hub” which is an osg::Group I obviously can’t
> cast that to a osgSim::DOFTransform. I’m trying to get an understand of how
> I can change the model, now in osgt (readable) format, to a structure that
> can be used. I’ve been using the tank.osg as a guide and attempted to
> recreate a similar structure in the helicopter.osgt. I’m trying to take
> logical stabs in the dark, in the helicopter model I’ve attempted to simply
> renamed the “node” of interest from an osg::Group to osgSim::DOFTransform.
> The model still displays correctly, but the cast to osgSim::DOFTransform
> returns NULL. I thought there may be some required variables at are needed
> as part of the osgSim::DOFTrans
Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Hi Jeremy,
Yes programmatically. You simply create a Transform, DOFTransform, whatever
and set all the children of the original Group as childs of the new one
(transforms, as you surely know are groups too).
Lastly you want to want to set the parent as well. I haven’t used OSG in a
while, but this pattern for sure works.
If you have more questions fell free to ask.
Cheers
Sebastian
From: osg-users On Behalf Of
OpenSceneGraph Users
Sent: Donnerstag, 16. April 2020 14:36
To: OpenSceneGraph Users
Subject: Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
Sebastian, I've used the nodevisitor to find the node by name, the node just
happens to be a osg::group. Could you explain what you mean by "replace them
with a DOF-Transform"? I'm optimistic that you mean programmatically. My
current approach is to replace it manually in the osgt file.
Thanks
Jeremy
On Thursday, April 16, 2020 at 7:14:18 AM UTC-4, OpenSceneGraph Users wrote:
Hi Jeremy,
As your geometry-parts are usually under a transform /group you can use a
NodeVisitor to collect those (Find the nodes by name) and replace them with a
DOF-Transform.
You could of course also mess with the osgt-files, but that would be a last
resort.
Cheers
Sebastian
From: osg-users > On Behalf
Of OpenSceneGraph Users
Sent: Mittwoch, 15. April 2020 21:54
To: OpenSceneGraph Users >
Subject: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
First off, I hope everyone is staying sane and healthy during this pandemic.
I’m working with a collection of 3D models that have come from a variety of
different source but are now all in osgb format. For several of the models I’d
like to grab a “node” and apply rotation.
As I’m working through my understanding of the approach, I’ve created a simple
application that loads the model, traverses the scene, returns a pointer to the
“node”, casts to a DOFTransform and manipulate the “node” (DOFTransform).
Snippet:
FindNamedNodeVisitor fnnv("turret");
scene->accept(fnnv);
osg::ref_ptr dofTrans = new osgSim::DOFTransform();
dofTrans =
dynamic_cast(fnnv.getFoundNode()->asTransform());
if(dofTrans != NULL)
//manipulate (rotate)
This approach works for the tank.osg model. Now I’m trying to apply this
approach to a different model (helicopter for example). When I access the
“node” of interest, “Main_Hub” which is an osg::Group I obviously can’t cast
that to a osgSim::DOFTransform. I’m trying to get an understand of how I can
change the model, now in osgt (readable) format, to a structure that can be
used. I’ve been using the tank.osg as a guide and attempted to recreate a
similar structure in the helicopter.osgt. I’m trying to take logical stabs in
the dark, in the helicopter model I’ve attempted to simply renamed the “node”
of interest from an osg::Group to osgSim::DOFTransform. The model still
displays correctly, but the cast to osgSim::DOFTransform returns NULL. I
thought there may be some required variables at are needed as part of the
osgSim::DOFTransform structure, so I began adding currentHPR, currentTranslate,
and currentScale and continued to add more bringing it in line with the
tank.osg example. Through all the attempts I still getting NULL when casting.
I’m looking for any guidance/suggestions/lessons learned on how to properly do
this.
Thanks in advance
Jeremy
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Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Sebastian, I've used the nodevisitor to find the node by name, the node
just happens to be a osg::group. Could you explain what you mean by
"replace them with a DOF-Transform"? I'm optimistic that you mean
programmatically. My current approach is to replace it manually in the osgt
file.
Thanks
Jeremy
On Thursday, April 16, 2020 at 7:14:18 AM UTC-4, OpenSceneGraph Users wrote:
>
> Hi Jeremy,
>
>
>
> As your geometry-parts are usually under a transform /group you can use a
> NodeVisitor to collect those (Find the nodes by name) and replace them with
> a DOF-Transform.
>
> You could of course also mess with the osgt-files, but that would be a
> last resort.
>
>
>
> Cheers
>
> Sebastian
>
>
>
> *From:* osg-users > *On
> Behalf Of *OpenSceneGraph Users
> *Sent:* Mittwoch, 15. April 2020 21:54
> *To:* OpenSceneGraph Users >
> *Subject:* [osg-users] Edit 3D (osgt) model to add DOFTransform and
> perform "node" rotation
>
>
>
> First off, I hope everyone is staying sane and healthy during this
> pandemic.
>
>
>
> I’m working with a collection of 3D models that have come from a variety
> of different source but are now all in osgb format. For several of the
> models I’d like to grab a “node” and apply rotation.
>
>
>
> As I’m working through my understanding of the approach, I’ve created a
> simple application that loads the model, traverses the scene, returns a
> pointer to the “node”, casts to a DOFTransform and manipulate the “node”
> (DOFTransform). Snippet:
>
> FindNamedNodeVisitor fnnv("turret");
>
> scene->accept(fnnv);
>
> osg::ref_ptr dofTrans = new osgSim::DOFTransform();
>
> dofTrans =
> dynamic_cast(fnnv.getFoundNode()->asTransform());
>
> if(dofTrans != NULL)
>
> //manipulate (rotate)
>
>
>
> This approach works for the tank.osg model. Now I’m trying to apply this
> approach to a different model (helicopter for example). When I access the
> “node” of interest, “Main_Hub” which is an osg::Group I obviously can’t
> cast that to a osgSim::DOFTransform. I’m trying to get an understand of how
> I can change the model, now in osgt (readable) format, to a structure that
> can be used. I’ve been using the tank.osg as a guide and attempted to
> recreate a similar structure in the helicopter.osgt. I’m trying to take
> logical stabs in the dark, in the helicopter model I’ve attempted to simply
> renamed the “node” of interest from an osg::Group to osgSim::DOFTransform.
> The model still displays correctly, but the cast to osgSim::DOFTransform
> returns NULL. I thought there may be some required variables at are needed
> as part of the osgSim::DOFTransform structure, so I began adding
> currentHPR, currentTranslate, and currentScale and continued to add more
> bringing it in line with the tank.osg example. Through all the attempts I
> still getting NULL when casting.
>
>
>
> I’m looking for any guidance/suggestions/lessons learned on how to
> properly do this.
>
>
>
> Thanks in advance
>
>
>
> Jeremy
>
> --
> You received this message because you are subscribed to the Google Groups
> "OpenSceneGraph Users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to osg-users+unsubscr...@googlegroups.com .
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/osg-users/cbb4b132-24a7-4e75-b10f-7474c1a99378%40googlegroups.com
>
>
> .
>
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Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Laurens, I focused on the osgSIM::DOFTransform since it was the example in
the tank.osg file, but I will look into the other transform options. Thank
you.
On Thursday, April 16, 2020 at 4:55:21 AM UTC-4, Voerman, L. wrote:
>
> Hi Jeremy,
> editing your helicopter.osgt should work, and while I never work with
> osgSim::DOFTransform
> (I alway use osg::MatixTransform) both descend from osg::Group, and can be
> used in osg text files to replace a group.
> However, the optimizer might find a transform with an identity matrix, and
> optimize it to a Group again.
> To test your edits, use these commands:
> set OSG_OPTIMIZER=OFF
> osgconv helicopter.osgt rw_test.osgt
> winmerge helicopter.osgt rw_test.osgt
> You should find all default values filled in the rw_test.osgt.
>
> Laurens.
>
>
> On Wed, Apr 15, 2020 at 10:17 PM OpenSceneGraph Users <
> osg-...@lists.openscenegraph.org > wrote:
>
>> First off, I hope everyone is staying sane and healthy during this
>> pandemic.
>>
>>
>>
>> I’m working with a collection of 3D models that have come from a variety
>> of different source but are now all in osgb format. For several of the
>> models I’d like to grab a “node” and apply rotation.
>>
>>
>>
>> As I’m working through my understanding of the approach, I’ve created a
>> simple application that loads the model, traverses the scene, returns a
>> pointer to the “node”, casts to a DOFTransform and manipulate the “node”
>> (DOFTransform). Snippet:
>>
>> FindNamedNodeVisitor fnnv("turret");
>>
>> scene->accept(fnnv);
>>
>> osg::ref_ptr dofTrans = new osgSim::DOFTransform();
>>
>> dofTrans =
>> dynamic_cast(fnnv.getFoundNode()->asTransform());
>>
>> if(dofTrans != NULL)
>>
>> //manipulate (rotate)
>>
>>
>>
>> This approach works for the tank.osg model. Now I’m trying to apply this
>> approach to a different model (helicopter for example). When I access the
>> “node” of interest, “Main_Hub” which is an osg::Group I obviously can’t
>> cast that to a osgSim::DOFTransform. I’m trying to get an understand of how
>> I can change the model, now in osgt (readable) format, to a structure that
>> can be used. I’ve been using the tank.osg as a guide and attempted to
>> recreate a similar structure in the helicopter.osgt. I’m trying to take
>> logical stabs in the dark, in the helicopter model I’ve attempted to simply
>> renamed the “node” of interest from an osg::Group to osgSim::DOFTransform.
>> The model still displays correctly, but the cast to osgSim::DOFTransform
>> returns NULL. I thought there may be some required variables at are needed
>> as part of the osgSim::DOFTransform structure, so I began adding
>> currentHPR, currentTranslate, and currentScale and continued to add more
>> bringing it in line with the tank.osg example. Through all the attempts I
>> still getting NULL when casting.
>>
>>
>>
>> I’m looking for any guidance/suggestions/lessons learned on how to
>> properly do this.
>>
>>
>> Thanks in advance
>>
>>
>>
>> Jeremy
>>
>> --
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>>
>>
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Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Thanks Robert, I thought the structure may be a bit much but here is the
high level breakdown:
osg::MatrixTransform
-osg::Group
--osg::StateSet
-osg::Group
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Group
--osg::Geode
--osg::Group
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Group
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Group
--osg::Group
--osg::Group
--osg::Group
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Geode
--osg::Group
---osg::Group "Main_Hub"
osg::Geode
-osg::Geometry
--osg::StateSet
---osg::DrawArray
osg::Vec3Array
--osg::Group "Tail_Hub"
Again I'm looking to access the osg::Group "Main_Hub" get Transform
functionality from it.
Jeremy
On Thursday, April 16, 2020 at 2:39:10 AM UTC-4, OpenSceneGraph Users wrote:
>
> Hi Jeremy,
>
> The DOFTransform example you've come across only works for a
> osgSIM::DOFTransform because it was created with this type of
> DOFTransform. THE DOFTransform is written specifically for OpenFlight
> support so only created by the the OSG .flt loader, most other models will
> use other types of osg::Transform nodes such as osg::MatrixTransform or
> osg::PositionAttitutudeTransform.
>
> You haven't provide any details about the scene graphs structure of your
> helicopter.osgt so we can't tell what to look for, the model might not even
> have any Transform node in it, in which case you'll need to add one.
>
> Robert.
>
>
>
> On Wed, 15 Apr 2020 at 21:55, OpenSceneGraph Users <
> osg-...@lists.openscenegraph.org > wrote:
>
>> First off, I hope everyone is staying sane and healthy during this
>> pandemic.
>>
>>
>>
>> I’m working with a collection of 3D models that have come from a variety
>> of different source but are now all in osgb format. For several of the
>> models I’d like to grab a “node” and apply rotation.
>>
>>
>>
>> As I’m working through my understanding of the approach, I’ve created a
>> simple application that loads the model, traverses the scene, returns a
>> pointer to the “node”, casts to a DOFTransform and manipulate the “node”
>> (DOFTransform). Snippet:
>>
>> FindNamedNodeVisitor fnnv("turret");
>>
>> scene->accept(fnnv);
>>
>> osg::ref_ptr dofTrans = new osgSim::DOFTransform();
>>
>> dofTrans =
>> dynamic_cast(fnnv.getFoundNode()->asTransform());
>>
>> if(dofTrans != NULL)
>>
>> //manipulate (rotate)
>>
>>
>>
>> This approach works for the tank.osg model. Now I’m trying to apply this
>> approach to a different model (helicopter for example). When I access the
>> “node” of interest, “Main_Hub” which is an osg::Group I obviously can’t
>> cast that to a osgSim::DOFTransform. I’m trying to get an understand of how
>> I can change the model, now in osgt (readable) format, to a structure that
>> can be used. I’ve been using the tank.osg as a guide and attempted to
>> recreate a similar structure in the helicopter.osgt. I’m trying to take
>> logical stabs in the dark, in the helicopter model I’ve attempted to simply
>> renamed the “node” of interest from an osg::Group to osgSim::DOFTransform.
>> The model still displays correctly, but the cast to osgSim::DOFTransform
>> returns NULL. I thought there may be some required variables at are needed
>> as part of the osgSim::DOFTransform structure, so I began adding
>> currentHPR, currentTranslate, and currentScale and continued to add more
>> bringing it in line with the tank.osg example. Through all the attempts I
>> still getting NULL when casting.
>>
>>
>>
>> I’m looking for any guidance/suggestions/lessons learned on how to
>> properly do this.
>>
>>
>> Thanks in advance
>>
>>
>>
>> Jeremy
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "OpenSceneGraph Users" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to osg-...@googlegroups.com .
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/osg-users/cbb4b132-24a7-4e75-b10f-7474c1a99378%40googlegroups.com
>>
>>
>> .
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Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Hi Jeremy,
As your geometry-parts are usually under a transform /group you can use a
NodeVisitor to collect those (Find the nodes by name) and replace them with a
DOF-Transform.
You could of course also mess with the osgt-files, but that would be a last
resort.
Cheers
Sebastian
From: osg-users On Behalf Of
OpenSceneGraph Users
Sent: Mittwoch, 15. April 2020 21:54
To: OpenSceneGraph Users
Subject: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform
"node" rotation
First off, I hope everyone is staying sane and healthy during this pandemic.
I’m working with a collection of 3D models that have come from a variety of
different source but are now all in osgb format. For several of the models I’d
like to grab a “node” and apply rotation.
As I’m working through my understanding of the approach, I’ve created a simple
application that loads the model, traverses the scene, returns a pointer to the
“node”, casts to a DOFTransform and manipulate the “node” (DOFTransform).
Snippet:
FindNamedNodeVisitor fnnv("turret");
scene->accept(fnnv);
osg::ref_ptr dofTrans = new osgSim::DOFTransform();
dofTrans =
dynamic_cast(fnnv.getFoundNode()->asTransform());
if(dofTrans != NULL)
//manipulate (rotate)
This approach works for the tank.osg model. Now I’m trying to apply this
approach to a different model (helicopter for example). When I access the
“node” of interest, “Main_Hub” which is an osg::Group I obviously can’t cast
that to a osgSim::DOFTransform. I’m trying to get an understand of how I can
change the model, now in osgt (readable) format, to a structure that can be
used. I’ve been using the tank.osg as a guide and attempted to recreate a
similar structure in the helicopter.osgt. I’m trying to take logical stabs in
the dark, in the helicopter model I’ve attempted to simply renamed the “node”
of interest from an osg::Group to osgSim::DOFTransform. The model still
displays correctly, but the cast to osgSim::DOFTransform returns NULL. I
thought there may be some required variables at are needed as part of the
osgSim::DOFTransform structure, so I began adding currentHPR, currentTranslate,
and currentScale and continued to add more bringing it in line with the
tank.osg example. Through all the attempts I still getting NULL when casting.
I’m looking for any guidance/suggestions/lessons learned on how to properly do
this.
Thanks in advance
Jeremy
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Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Hi Jeremy,
editing your helicopter.osgt should work, and while I never work with
osgSim::DOFTransform
(I alway use osg::MatixTransform) both descend from osg::Group, and can be
used in osg text files to replace a group.
However, the optimizer might find a transform with an identity matrix, and
optimize it to a Group again.
To test your edits, use these commands:
set OSG_OPTIMIZER=OFF
osgconv helicopter.osgt rw_test.osgt
winmerge helicopter.osgt rw_test.osgt
You should find all default values filled in the rw_test.osgt.
Laurens.
On Wed, Apr 15, 2020 at 10:17 PM OpenSceneGraph Users <
osg-users@lists.openscenegraph.org> wrote:
> First off, I hope everyone is staying sane and healthy during this
> pandemic.
>
>
>
> I’m working with a collection of 3D models that have come from a variety
> of different source but are now all in osgb format. For several of the
> models I’d like to grab a “node” and apply rotation.
>
>
>
> As I’m working through my understanding of the approach, I’ve created a
> simple application that loads the model, traverses the scene, returns a
> pointer to the “node”, casts to a DOFTransform and manipulate the “node”
> (DOFTransform). Snippet:
>
> FindNamedNodeVisitor fnnv("turret");
>
> scene->accept(fnnv);
>
> osg::ref_ptr dofTrans = new osgSim::DOFTransform();
>
> dofTrans =
> dynamic_cast(fnnv.getFoundNode()->asTransform());
>
> if(dofTrans != NULL)
>
> //manipulate (rotate)
>
>
>
> This approach works for the tank.osg model. Now I’m trying to apply this
> approach to a different model (helicopter for example). When I access the
> “node” of interest, “Main_Hub” which is an osg::Group I obviously can’t
> cast that to a osgSim::DOFTransform. I’m trying to get an understand of how
> I can change the model, now in osgt (readable) format, to a structure that
> can be used. I’ve been using the tank.osg as a guide and attempted to
> recreate a similar structure in the helicopter.osgt. I’m trying to take
> logical stabs in the dark, in the helicopter model I’ve attempted to simply
> renamed the “node” of interest from an osg::Group to osgSim::DOFTransform.
> The model still displays correctly, but the cast to osgSim::DOFTransform
> returns NULL. I thought there may be some required variables at are needed
> as part of the osgSim::DOFTransform structure, so I began adding
> currentHPR, currentTranslate, and currentScale and continued to add more
> bringing it in line with the tank.osg example. Through all the attempts I
> still getting NULL when casting.
>
>
>
> I’m looking for any guidance/suggestions/lessons learned on how to
> properly do this.
>
>
> Thanks in advance
>
>
>
> Jeremy
>
> --
> You received this message because you are subscribed to the Google Groups
> "OpenSceneGraph Users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to osg-users+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/osg-users/cbb4b132-24a7-4e75-b10f-7474c1a99378%40googlegroups.com
>
> .
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Re: [osg-users] Edit 3D (osgt) model to add DOFTransform and perform "node" rotation
Hi Jeremy,
The DOFTransform example you've come across only works for a
osgSIM::DOFTransform because it was created with this type of
DOFTransform. THE DOFTransform is written specifically for OpenFlight
support so only created by the the OSG .flt loader, most other models will
use other types of osg::Transform nodes such as osg::MatrixTransform or
osg::PositionAttitutudeTransform.
You haven't provide any details about the scene graphs structure of your
helicopter.osgt so we can't tell what to look for, the model might not even
have any Transform node in it, in which case you'll need to add one.
Robert.
On Wed, 15 Apr 2020 at 21:55, OpenSceneGraph Users <
osg-users@lists.openscenegraph.org> wrote:
> First off, I hope everyone is staying sane and healthy during this
> pandemic.
>
>
>
> I’m working with a collection of 3D models that have come from a variety
> of different source but are now all in osgb format. For several of the
> models I’d like to grab a “node” and apply rotation.
>
>
>
> As I’m working through my understanding of the approach, I’ve created a
> simple application that loads the model, traverses the scene, returns a
> pointer to the “node”, casts to a DOFTransform and manipulate the “node”
> (DOFTransform). Snippet:
>
> FindNamedNodeVisitor fnnv("turret");
>
> scene->accept(fnnv);
>
> osg::ref_ptr dofTrans = new osgSim::DOFTransform();
>
> dofTrans =
> dynamic_cast(fnnv.getFoundNode()->asTransform());
>
> if(dofTrans != NULL)
>
> //manipulate (rotate)
>
>
>
> This approach works for the tank.osg model. Now I’m trying to apply this
> approach to a different model (helicopter for example). When I access the
> “node” of interest, “Main_Hub” which is an osg::Group I obviously can’t
> cast that to a osgSim::DOFTransform. I’m trying to get an understand of how
> I can change the model, now in osgt (readable) format, to a structure that
> can be used. I’ve been using the tank.osg as a guide and attempted to
> recreate a similar structure in the helicopter.osgt. I’m trying to take
> logical stabs in the dark, in the helicopter model I’ve attempted to simply
> renamed the “node” of interest from an osg::Group to osgSim::DOFTransform.
> The model still displays correctly, but the cast to osgSim::DOFTransform
> returns NULL. I thought there may be some required variables at are needed
> as part of the osgSim::DOFTransform structure, so I began adding
> currentHPR, currentTranslate, and currentScale and continued to add more
> bringing it in line with the tank.osg example. Through all the attempts I
> still getting NULL when casting.
>
>
>
> I’m looking for any guidance/suggestions/lessons learned on how to
> properly do this.
>
>
> Thanks in advance
>
>
>
> Jeremy
>
> --
> You received this message because you are subscribed to the Google Groups
> "OpenSceneGraph Users" group.
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>
> .
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