The way I'd tackle dragging of objects in model space that are billboarded
icons would be to project the mouse coords into clip coords then into
object space using the matrices inverse of the (projection * view *
model). You'd also need to compute the depth to use, this could be
computed by
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
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
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
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
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 wrote:
> Hi,
>
> Is there a way to change the view matrix or projection
> Hi,
>
> Is there a way to change the view matrix or projection matrix for a just a
> specific node in fixed pipeline mode?
>
>
>
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Hi,
Is there a way to change the view matrix or projection matrix for a just a
specific node in fixed pipeline mode?
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