Quick answer: Pygame Rect.clamp_ip producing zero motion when the rect is bigger than the bound? clamp_ip moves the rect to fit; an over-large rect can’t fit and stays fixed.
Camera Rect clamped to world bounds; when player’s view is larger than the world (small test level), camera stops moving entirely.
clamp_ip Semantics
Moves the rect minimally so it fits inside the bound. If the rect’s dimensions exceed the bound’s, no in-position move can fit — the rect stays put.
Center vs Clamp
For oversized cameras, center the rect on the bound rather than clamping: rect.center = bound.center. Looks intentional rather than stuck.
Per-Axis Clamp
rect.left = max(rect.left, bound.left)
rect.right = min(rect.right, bound.right)Manual per-axis. Won’t produce the all-or-nothing clamp_ip behavior.
Letterbox
If world is smaller than camera, fix the rect and draw letterbox bars. Camera = world; UI fills the excess.
Verifying
Camera follows player correctly across world sizes. Small worlds center; large worlds clamp; ultra-small show letterbox.
“clamp_ip fails for oversized rects. Center or manual-clamp instead.”
Build a smart camera that detects world-vs-camera-size and picks center vs clamp automatically — one function, no per-level tuning.