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> Imagine you're spinning a globe with your finger. Obviously not much would happen if you poked outside the globe. And this is why arcball is not a good solut
by nox101 2y ago
> Imagine you're spinning a globe with your finger. Obviously not much would happen if you poked outside the globe.
And this is why arcball is not a good solution. I'm not putting my finger on a global. I'm spinning a world, terrain, airplane, etc. There's no "ball" so arc"ball" doesn't fit.
It gets worse. What if there is a ball but it's say 4 cm across on my screen. When I rotate with "arcball" am I touch that ball or some imaginary ball much larger than the visible ball. This problem exists all over depending on the thing I'm trying to rotate, arcball won't match.
- romwell 2y ago> I'm spinning a world [...] there's no "ball" I don't think I understand you, unless you insist that the Earth is flat :) >It gets worse. What if there is a ball but it's say 4 cm across on my screen. Then you zoom in / adjust gizmo size / etc. Surely any interface can be made unusable if you shrink it down far enough. The arcball gizmo is usually visible; I was too lazy to paint a nice one in a bare-bones demo.