[osg-users] Node with different projection/view matrix fixed pipeline

[Catalin]

Hi Robert,

Yes I am using osg::Billboard for that now, but the user in the old code
had possibility to move those billboards in view space with the mouse,
left,right,up down.

The green tags are attached to some other objects, but the user can move it
in view space with the mouse, left,right,up down.

See the green tags.

https://i.imgur.com/bjQnlBq.png

On Thu, 16 Jan 2020 at 13:18, Robert Osfield <robert.osfield at gmail.com>
wrote:

> Hi Catalin,
>
> I'm still a bit confused from your explanation.
>
> Is it simply that you want a 2D overlay on your scene?  Have a look at the
> osghud example - this uses an osg::Camera to set a user define view and
> projection matrix for it's subgraph.
>
> If you want object to be rendered like billboards within the 3D world then
> there is the osg::Billboard and osg::AutoTransform classes.
>
> Robert.
>
> On Thu, 16 Jan 2020 at 09:07, Catalin <inbox.icf at gmail.com> wrote:
>
>> Hi Robert,
>>
>> I have an old code, as you know. Some objects are rendered with OpenGL,
>> but before that the ViewMatrix is set to identity, as the the objects are
>> having their position computed as follow:
>>
>> ObjectPositionView = ViewMatrix * ObjectPosition + 2D Move Vector(x,y) in
>> view space
>>
>> ObjectPositionView already contains the ViewMatrix, so I am feeding it
>> directly to the Open GL.
>>
>> Those object are some billboards but with the option to be moved in the
>> view space, like a 2D move.
>>
>> If I give directly the ObjectPosition to OSG, it works fine with
>> billboards but I don't know how to incorporated the 2D Move Vector, that
>> vector is in the view space.
>>
>> On Thu, 16 Jan 2020 at 10:18, Robert Osfield <robert.osfield at gmail.com>
>> wrote:
>>
>>> Hi Catalin,
>>>
>>> Could you explain what you are trying to do with the rendering of this
>>> node? What you are attempting to do will guide the best way to implement
>>> what you need.
>>>
>>> Robert.
>>>
>>> On Thu, 16 Jan 2020 at 07:33, Catalin <inbox.icf at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> Is there a way to change the view matrix or projection matrix for a
>>>> just a specific node in fixed pipeline mode?
>>>>
>>>>
>>>> _______________________________________________
>>>> osg-users mailing list
>>>> osg-users at lists.openscenegraph.org
>>>>
>>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>>>
>>> _______________________________________________
>>> osg-users mailing list
>>> osg-users at lists.openscenegraph.org
>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>>
>> _______________________________________________
>> osg-users mailing list
>> osg-users at lists.openscenegraph.org
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/attachments/20200116/19a1b9d4/attachment.html>