On Sat, Apr 4, 2015 at 2:57 AM, Till Oliver Knoll < till.oliver.kn...@gmail.com> wrote:
> > >> ... > >> > >> That's the way to draw "over OpenGL" - not with a restricted "drawText" > convenience method which happened to be placed in some random API > (QGLWidget) over a decade ago ;) > > > > The problem is I don't *want* to draw "over" GL¹. I *need* to draw *in* > > GL, specifically I need to specify the text location in terms of the GL > > modelview space. > > ... > > Overpainting techniques are fine... *for overpainting*. That's not what > > I'm doing. > > Clearly I cannot predict your application's requirements, but > "overpainting", that's exactly what you were doing apparently, all the > time. You said so yourself, you were using > > http://doc.qt.io/qt-4.8/qglwidget.html#renderText > > I've never used this method myself, but from what I gather you specify the > text coordinates in /window/ coordinates - /not/ world (or model) > coordinates! > > So all the "renderText" does is it "overpaints" the given text into the > current GL buffer (by disabling the depth test). > > You get exactly the same result (probably even a better one due to better > anti-aliasing) by using a QPainter and "overpaint" at the same window > coordinates. > > So this method did not do what you now tell us what your requirements are. > So one reason more to quickly remove it (before people come and request to > please extend the API such that the coordinates could be specified also in > model/world coordinates ;)). > I think you missed this overload of renderText: http://doc.qt.io/qt-4.8/qglwidget.html#renderText-2 This takes object coordinates, including a z value. The removal of this overload of renderText() was a significant blow to our efforts in moving from 4.8 to 5. Adam
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