Hello Johannes,
On 12/01/2011 09:47 AM, Johannes Brunen wrote:
> I have a scene setup with an orthographic or perspective camera. Now, I
> have to add some geometry which shoud not change its size on camera
> zooming in the scene. I.e. the size of the geometry should always appear
> the same, indepent of the view distance.
so you'd need something that looks at the size of the projected bounding
sphere on the screen, compares it with a target size and derives a scale
factor from that. Then translate to the center of the bounding volume,
apply the scale and translate back?
> How should I tackle this problem? Does OpenSG have something to support
> such a scenario?
I'm not sure we have something that matches your needs exactly, but the
merge of David Kabala's toolbox brought in ScreenTransform which IIUC
keeps an object at the same screen position as a beacon object. I'm not
sure what it does about scaling, but it's worth taking a look.
Cheers,
Carsten
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