[Interest] Qt3D point light intesity

[Megidd Git]

Hi!

I'm using point light <https://doc.qt.io/qt-5/qt3drender-qpointlight.html> in
a 3D scene with entities of Phong
<https://doc.qt.io/qt-5/qt3dextras-qmorphphongmaterial.html> material. I
just want to be able to increase/decrease point light *intensity*. Point
light has three properties:

- constantAttenuation : float
- linearAttenuation : float
- quadraticAttenuation : float

Documentation mentions that the exact meaning and use of those properties
is up to the material implementation. Now I wonder how can I simply
decrease/increase light intensity, considering that I'm using Phong
<https://doc.qt.io/qt-5/qt3dextras-qmorphphongmaterial.html> material.

Thanks
😃
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