This article makes me very, very strongly want Bryce 3D for iPad.
Everything about using that app was about trying to make you feel like you could reach out and touch the screen. Now you can. Its user interface was nonsenical at the time. Now a spherical marble is sensible. Tap an object, then tap and hold; use other hand to operate the three-axis arrow control bar that swells up out of the interface into easy to touch controls. When you let go, they pop with a little spray of tri-color paint and a few speckles get left on the user interface.
Seriously, we have done almost nothing with what’s possible because everything is either Word, Letterpress, Tabletop Simulator, or cross-platform port. Meanwhile there’s an engine in there powerful enough to run Bryce with realtime rendering, but everyone wants to emulate a sheet of paper rather than letting me do the most basic things.
We could have painting with a pen and controlling z-depth with a hand at the same time. Path snap to collision avoidance margins on a slider. Negative margins and a setting to define collision handling: do you materials simulate two oils colliding at their spline velocity? Do they intersperse and blend like translucent colored sand? How far after the intersection does the aftertint continue in the brush stream?
Instead, we have, courtesy of AI, U-turned the industry all the way back to text adventure games with sentient potatoes.
Sigh.
Moment of Inspiration seems the most promising 3D modeling option --- done by the former lead developer of Rhinoceros 3D it's probably what I'm going to break down and buy if crash-and-burn on my current attempt to learn Alibre Atom 3D.