03-12-2021, 12:53 PM
I have analyzed the code in FitIntoView and optimized the slowest part of the code so that this is now around 50% faster.
But even without the optimization, this should not take so long as in your case.
After some additional checks, I see that the probable reason for a long time is that the FitIntoView code also calls Ab3d.Utilities.LinesUpdater.Instance.Refresh() method. In case when no DXEngine is used, this method regenerated all 3D lines - regenerates the geometry for all 3D lines. This can take quite some time when there are a lot of 3D lines in the scene. This call is needed to update the lines before the FitIntoView is called.
If you would use Ab3d.DXEngine than LinesUpdater.Instance.Refresh call would be a no-op. Also, rendering 3D lines is greatly accelerated and does not require costly geometry build on the CPU - you can render millions of 3D lines and still have high FPS (on a modern GPU).
To avoid calling LinesUpdater.Instance.Refresh method, you can also call camera.GetFitIntoViewDistanceOrCameraWidth (this is also called inside FitIntoView method) and the set the camera's Distance / CameraWidth based on the result of this method. But this will just postone the regeneration of lines.
But even without the optimization, this should not take so long as in your case.
After some additional checks, I see that the probable reason for a long time is that the FitIntoView code also calls Ab3d.Utilities.LinesUpdater.Instance.Refresh() method. In case when no DXEngine is used, this method regenerated all 3D lines - regenerates the geometry for all 3D lines. This can take quite some time when there are a lot of 3D lines in the scene. This call is needed to update the lines before the FitIntoView is called.
If you would use Ab3d.DXEngine than LinesUpdater.Instance.Refresh call would be a no-op. Also, rendering 3D lines is greatly accelerated and does not require costly geometry build on the CPU - you can render millions of 3D lines and still have high FPS (on a modern GPU).
To avoid calling LinesUpdater.Instance.Refresh method, you can also call camera.GetFitIntoViewDistanceOrCameraWidth (this is also called inside FitIntoView method) and the set the camera's Distance / CameraWidth based on the result of this method. But this will just postone the regeneration of lines.
Andrej Benedik