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V2 Camera Mode Interpolation

durations, blend function, duration clamping, location, rotation, and FOV interpolation toggles, and whether the exported mode preserves target mode metadata.

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Camera mode interpolation blends between two FV2CameraModeSpec values over an explicit duration. It resolves smooth position, rotation, and FOV transitions for mode changes that need a designer-controlled duration instead of only using the target mode's stack blend time.

Runtime Surface#

  • FV2CameraModeInterpolationConfig configures default, minimum, and maximum durations, blend function, duration clamping, location, rotation, and FOV interpolation toggles, and whether the exported mode preserves target mode metadata.
  • FV2CameraModeInterpolationRequest carries source and target camera modes, requested duration, elapsed seconds, delta seconds, and force-cut state.
  • FV2CameraModeInterpolationEvaluation returns source and target ids, active mode type, blended pose, FOV, duration, elapsed time, raw and shaped alpha, remaining time, completion flags, exported mode spec, and validation issues.

Blend Rules#

  1. Invalid config, invalid modes, or invalid request timing is blocking.
  2. RequestedDurationSeconds uses DefaultDurationSeconds when it is zero.
  3. When duration clamping is enabled, requested duration is clamped between the configured minimum and maximum and reported as DurationClamped.
  4. Position, rotation, and FOV each honor their interpolation toggles.
  5. Rotation interpolation uses shortest-path pitch, yaw, and roll deltas.
  6. Force cut, cut blend function, zero duration, or same source and target mode immediately resolves to the target mode and reports CutApplied.
  7. Completion is based on raw elapsed alpha so eased blends still complete at the configured duration.

Camera Manager Export#

EvaluateCameraModeInterpolation fills ModeSpec with the target mode id, priority, active flag, and blended pose. When target metadata preservation is enabled, the exported mode keeps the target blend function, input, cinematic, and priority-blocking flags. BuildCameraModeInterpolationMode can also export a custom mode id, priority, and active flag.

Validation Commands#

Run these targeted checks when touching camera mode interpolation:

bash
python3 V2/ue/Tools/check-v2-camera-mode-interpolation.py
python3 V2/ue/Tools/check-v2-camera-manager.py
python3 V2/ue/Tools/check-v2-ci-workflow.py
python3 -m json.tool V2/ue/Content/V2/Gameplay/Camera/CameraModeInterpolation_V2_Contract.json
python3 -m py_compile V2/ue/Tools/check-v2-camera-mode-interpolation.py