Here’s a concise summary of an ideal free camera control scheme:
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WASD/Arrow keys for movement
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Mouse for looking/rotation
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Mouse wheel for zooming
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Right-click or middle mouse for panning
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Shift for speed boost
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Ctrl for slowing down
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Specific keys for toggling modes (free cam, chase cam, etc.)
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Specific keys for resetting, focusing, and collision detection
The key is to provide intuitive movement controls combined with easy access to camera speed adjustments, mode switching, and helpful utilities like panning, focusing, and collision toggling. Visual cues or an on-screen display can help communicate the available controls to the user.