add a way for let the user au center and size the camera on the sdf.

[aiekick]

maybe a code to add by the user like with space3d.

can be used only if this is the camera who control the rendering of the sdf (so using space3d)

a renderpack for render the sdf in a shader with an estimate of the min/max distance to cam of the sdf, at any points in grids of the sreen.

with these infos we can get the center of the visible sdf, and then with perspective angle, we can tune the camera pos for engloble the sdf in screen