Use Viewport -> Wireframe mode menu, or just hit Alt+Z shortcut, to toggle between viewing:

• Polygons,
• Wireframe or
• Polygons + Wireframe (internally known as weSolidWireframe).

At design-time, in “Fly” mode, mouse scroll wheel now does zoom (if you don’t have right mouse button pressed; when right mouse button is pressed, it changes moving speed, as before).

More details:

Zoom (by mouse scroll wheel) is now available for all navigation modes, including TCastleWalkNavigation. Although it is disabled on TCastleWalkNavigation by default, but you can just enable it by MyWalkNavigation.ZoomEnabled := true (or clicking on ZoomEnabled checkbox in editor).

Editor and view3dscene enable this zoom by default.

Also, zoom-in now honors collision detection. Though at design-time we disable collision detection.

We’ve done a few fixes to make TCastleWalkNavigation navigation, including mouse look, work even when the camera is a child of some other TCastleTransform with some transformation.

This gives you more flexibility where do you place TCastleCamera in the transformation hierarchy.