[osg-users] osgText: problem with SCREEN_COORDS mode

[Glenn Waldron]

Following up on my own post :)

https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgText/TextBase.cpp#L520

I think that rotation matrices will result in an incorrect computation of
the "left" and "up" vectors. So I think we need to use the translation and
scale only by removing "rotate_matrix" and also removing the rotation
component of "modelview". A quick test yields better results on my end.
Thoughts?

Glenn Waldron


On Thu, May 17, 2018 at 11:55 AM Glenn Waldron <gwaldron at gmail.com> wrote:

> Robert,
> I am getting the following problem with the tip of the OpenSceneGraph-3.6
> branch. (I am building under GL CORE profile on WIn64 but suspect that is
> not a factor.)
>
> This a simple osgText drawable in SCREEN_COORDS mode, tilted just a bit
> along the X axis:
>
> [image: 2018-05-17_115339.jpg]
>
> Here is a minimal application to reproduce the problem:
>
> https://pastebin.com/nuySbs8L
>
> Run this and then use the mouse to slowly tilt the scene. The text becomes
> stretched.
>
> Glenn Waldron
>
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