[Interest] Qt3D: A custom camera controller

[Volker Enderlein]

Am 29.01.2019 um 12:07 schrieb Volker Enderlein:
> Hi all,
>
> I implemented a custom camera controller (implementing the 
> ExaminerViewer camera handling from OpenInventor) and don't know how 
> to select the linearSpeed and the lookSpeed values dependent on the 
> size of the scene as my scenegraph can be changed at runtime. I came 
> up with a solution but it is not working as expected.
>
>     auto heightAngle = theCamera->fieldOfView() / 180.0f * 
> static_cast<float>(M_PI);
>     auto focalDist = theCamera->viewVector().length();
>     auto height = 2.0f * focalDist * std::tan(heightAngle / 2.0f);
>     height = height < 1.0f ? 1.0f : height;
>     auto width = height / theCamera->aspectRatio();
>     // NDC (left, right, bottom, top) (-1, 1, -1, 1)
>     // MagnificationFactor: max(height, width)/linearSpeed()
>     auto linearSpeedMagnificationFactor = std::max(height, 
> width)/linearSpeed();
>
> Are there any examples/experiences implementing custom camera 
> controllers?
>
> Thanks in advance,
>
> Cheers, Volker
>
Nevermind, I figured out how to do pixel exact displacement without 
using the linearSpeed or lookSpeed.


Cheers, Volker

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