Sprite2D in a UrhoSharp 3D Scene


I need to print flat png inside a sphere (it is a planetarium).
So I can make a square, facing the center, with a png texture but it is quite complicated. Moreover, how will I light all the squares facing the center?
In OpenGL, it is possible to print a png (this is called sprite in openGL).
Is that possible with UrhoSharp? With Particules?
The other solution would be to calculate myself the 2D coordinates of the sphere and print a png with SkiaSharp. But I won't take advantage of the graphic shipset to calculate the 2D projection of the 3D scene (instead with urhosharp I guess)...

What do you think?

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