Camera: Blender-style middle-mouse navigation (MMB orbit, Shift+MMB pan) #652

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opened 2026-10-10 22:42:05 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-10 22:42:05 +00:00

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Port Blender's middle-mouse viewport navigation:

MMB drag: orbit the camera.
Shift + MMB drag: pan the camera parallel to the view plane.
Optionally, Ctrl + MMB drag dollies (zooms) like Blender. Scroll-wheel zoom stays as it is.

Design

Orbit centre. Use the surface point under the cursor at drag start, the same as an Alt-focus. This matches the right-drag orbit already ported in #140; share that code. If nothing is under the cursor, orbit the current focus point. (Blender's "orbit around selection" and "auto depth" correspond to these two cases.)
Pan speed. Scale pan by the distance to the focus point, so the grabbed point stays under the cursor.
Mode. Leave the camera in free (Alt-cam) mode afterwards, like an Alt-orbit. The usual reset applies (Esc or walking).
Preference. Add a toggle under Preferences > Move & View, and a sensitivity setting shared with the other camera controls (#130).

Conflicts

MMB is bound to voice_follow_key (push-to-talk) in every mode in key_bindings.xml. Proposed: a plain middle-click without a drag still triggers push-to-talk, and a drag past a small threshold becomes orbit/pan. Alternatively, voice moves off MMB when the option is on. Decide which.
Check that Build, mouselook, the third-person shooter camera, Pose Studio (IK handles and rings) and media prims, which take MMB in CEF, still work.

Port Blender's middle-mouse viewport navigation: - **MMB drag:** orbit the camera. - **Shift + MMB drag:** pan the camera parallel to the view plane. - Optionally, **Ctrl + MMB drag** dollies (zooms) like Blender. Scroll-wheel zoom stays as it is. ## Design - **Orbit centre.** Use the surface point under the cursor at drag start, the same as an Alt-focus. This matches the right-drag orbit already ported in #140; share that code. If nothing is under the cursor, orbit the current focus point. (Blender's "orbit around selection" and "auto depth" correspond to these two cases.) - **Pan speed.** Scale pan by the distance to the focus point, so the grabbed point stays under the cursor. - **Mode.** Leave the camera in free (Alt-cam) mode afterwards, like an Alt-orbit. The usual reset applies (Esc or walking). - **Preference.** Add a toggle under Preferences > Move & View, and a sensitivity setting shared with the other camera controls (#130). ## Conflicts - MMB is bound to `voice_follow_key` (push-to-talk) in every mode in `key_bindings.xml`. Proposed: a plain middle-click without a drag still triggers push-to-talk, and a drag past a small threshold becomes orbit/pan. Alternatively, voice moves off MMB when the option is on. Decide which. - Check that Build, mouselook, the third-person shooter camera, Pose Studio (IK handles and rings) and media prims, which take MMB in CEF, still work.

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2026-10-10 22:42:05 +00:00

sky_line added this to the Slipstream project

2026-10-10 22:42:05 +00:00

sky_line referenced this issue from a commit

2026-10-11 15:12:36 +00:00

#652: Blender-style middle-mouse camera navigation (off by default)

sky_line referenced this issue from a commit

2026-10-11 15:12:36 +00:00

#652: pick the orbit centre at the press (inside the rig-pick click scope); talking is sticky; getBaseView returns the clamped base