b3dDebugTerrainHeight

Enables debug visualization of terrain height information. Takes no parameters. Returns nothing. Draws debug overlay showing terrain height data, typically as colored height map or wireframe visualization. Useful for debugging terrain collision, verifying terrain mesh data, and diagnosing terrain-related physics issues.

Debug visualization may include: height map colors (different colors for different elevations, visualize terrain topology), wireframe overlay (show terrain triangle mesh structure), collision mesh visualization (show physics collision triangles vs visual mesh), height probes (show raycasts testing terrain height at various points). Use during development only (disable in release builds for performance).

Use cases: (1) Verify terrain physics mesh (check if collision mesh matches visual), (2) Debug terrain raycasting (visualize where raycasts hit terrain), (3) Diagnose physics issues (check for holes or incorrect collision), (4) Terrain editing (visualize height changes during level design). Common pattern: call once during initialization for debug builds (if debugMode then b3dDebugTerrainHeight).

Performance: debug visualization has rendering cost (additional draw calls for visualization overlay, disable in release builds), minimal impact on physics (visualization only, doesn't affect simulation). Related: b3dCreateTerrainPhysicsMesh creates terrain collision (debug helps verify this mesh).