0.8.12

0.8.11's ambient occlusion broke VR, and this takes it out of the headset. Also: headset popups can be dragged and closed, and a model no longer shields itself from a blast. The headset fixes were verified in an EMULATED headset (a fake WebXR device in headless Chrome), not yet on a device.

Fixed

• SSAO broke VR. With ssao="always" a headset drew one image stretched across both eyes, and on put the same chain on the headset camera for the moment of entry. A post-process chain on a WebXR camera does not render per eye. SSAO is now removed before the headset camera takes over and restored when the session ends.
• Popups in a headset could not be dragged or closed by their title bar. Three causes, all found by driving an emulated controller:
  • the press was re-cast along Babylon's XR pointer ray, which is cut to the exact distance of what it hit, so the re-cast stopped a rounding error short of the popup and missed;
  • a drag that did start was cancelled by the first pointer move, because Babylon's XR moves carry button: 0 and the drag behaviour reads that as "another button pressed";
  • a popup torn off a tilted panel (the headset settings panel is tilted) snapped upright, and the drag then threw it metres away. The settings panel's own occlusion re-pick had the same cut-ray fault.
• A model's own hull shielded it from every blast. Blast line of sight exempted only the node each destroyable registered, and a library model registers a root with the hull as a child, so the ray to it stopped on its own hull. An aircraft with destroyable="on" took no blast damage, its own bomb included. Anything beneath a destroyable is now not cover; a wall still is. From manta-recon (board #2906).

Changed

• SSAO is flat-only, and ssao="always" is deprecated. 0.8.11 said always ran in a headset. It is the setting that broke the frame. It is still accepted, means on, and warns once.