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2026-06-03 09:00:11 +08:00
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openspec/changes/viewport-custom-camera/specs/maya-viewport-controls/spec.md
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## ADDED Requirements
### Requirement: Alt+LMB orbit navigation
The viewport SHALL orbit the camera around the focal point when the user holds Alt and drags with the left mouse button.
#### Scenario: Alt+LMB drag orbits the camera
- **WHEN** the user holds Alt and drags with the left mouse button inside the viewport
- **THEN** the camera orbits around the focal point based on the drag delta
#### Scenario: LMB without Alt does not orbit
- **WHEN** the user drags with the left mouse button without holding Alt
- **THEN** no orbit occurs and the click is forwarded for prim selection
### Requirement: Alt+MMB pan navigation
The viewport SHALL pan the camera when the user holds Alt and drags with the middle mouse button.
#### Scenario: Alt+MMB drag pans the camera
- **WHEN** the user holds Alt and drags with the middle mouse button inside the viewport
- **THEN** the camera pans horizontally and vertically based on the drag delta
### Requirement: Alt+RMB dolly navigation
The viewport SHALL dolly (zoom) the camera when the user holds Alt and drags with the right mouse button. Vertical drag upward moves the camera closer; downward moves it farther.
#### Scenario: Alt+RMB drag dollies the camera
- **WHEN** the user holds Alt and drags vertically with the right mouse button inside the viewport
- **THEN** the camera dollies in or out based on the vertical drag delta
### Requirement: Scroll zoom without Alt
The viewport SHALL zoom the camera when the user scrolls the mouse wheel, without requiring the Alt modifier.
#### Scenario: Scroll wheel zooms
- **WHEN** the user scrolls the mouse wheel while hovering over the viewport
- **THEN** the camera zooms in or out based on the scroll direction
### Requirement: Legacy input mappings removed
The previous input mappings (LMB for orbit, MMB for pan, Shift+LMB for pan) SHALL be replaced entirely by the Maya-style Alt+button scheme.
#### Scenario: MMB without Alt does not pan
- **WHEN** the user drags with the middle mouse button without holding Alt
- **THEN** no pan occurs
#### Scenario: Shift+LMB does not pan
- **WHEN** the user holds Shift and drags with the left mouse button
- **THEN** no pan occurs