You can use a 3D primitive model without a mouse by relying on keyboard shortcuts, touchscreen gestures, or gamepads mapped to core 3D tasks (e.g., moving, rotating, scaling).
Keyboard shortcuts (like Blender’s WASD for position or Ctrl+arrow keys for scaling) let you adjust primitives precisely. Touch gestures—pinch to scale, drag to rotate—work for tablets. Gamepads use sticks for smoother navigation.
For software like Blender, customize keyboard mappings in Preferences > Input to match your workflow; start with basic actions to get comfortable mouse-free.