In addition to appearance only in clear physics mode, I have implemented the following changes:
- New object markers for buttons ("BUTTON"), force fields ("FORCE" together with either a left or right arrow), splat pads ("SPLAT"), anti-splat pads ("SPLAT", but crossed out)
- Continuous traps read now "FIRE", single-use traps read "1TRAP" and usual triggered traps have an infinity symbol in front of "TRAP".
- I removed the object marker for disabled traps, because spent single-use traps and disabled traps aren't displayed in clear physics mode. Displaying an object marker for an invisible object felt weird.
- All object markers are now colored red, because this way they are well-readable even on the gray terrain in the clear physics mode.
- If an object marker would appear above the top edge of the level, it will be displayed below the object instead.
- The cursor position check does now align precisely with the object boundaries. Previously it was a few pixels off.

Comments? Suggestions? Rants?

(This post originally had its own topic, but forgot that it would make more sense if I posted it here).

It would also be nice to know the direction a blocker is facing when you hover over it in Clear Physics mode, much like how when you hover over a trapdoor it shows you which direction the lemmings are coming out.

This will especially be very useful in levels that use pre-placed blockers.

EDIT: Looking at the nx_sketches.dat, it will also be useful to show the blocker field in Clear Physics Mode.

Sounds good. The results could be misleading otherwise, since other lemming-specific features (such as shadows) only appear for the "selected" lemming, not all lemmings under the cursor.