Gun.Rotation = New Vec3f( -Mouse.Y, -Mouse.X,0)

[AmonParticipant]

I have my gun on screen. How do I clamp the values of Mouse.X/Y to only allow a certain amount of rotation? Also, How can I centre the mouse onscreen so that even if the mouse reaches the end of desktop width it still applies motion to the 3d world?

[EthernautParticipant]

You need to compare the current mouse coordinates with the coordinates in the previous frame (stored in a variable), and only apply that difference multiplied by a “mouseSensitivity” variable. If you’ve already reached the rotation you want to limit to, don’t rotate anymore! (something like: If Entity.Rotation.Y < limit Then RotateFunctionGoesHere() )

Not on my laptop, but you can specify the mouse coordinates using Mouse.Location = New Vec2f, I think.
My old code that handles first person mouse look is this (out of context):

Monkey

If firstPerson 'De-initializes mouselook if escape is pressed If Keyboard.KeyHit( Key.Escape ) _prevMouse = Null Mouse.PointerVisible = True End If _prevMouse 'Only starts updating if _prevMouse is initialized Local deltaX := ( Float(Mouse.Y) - _prevMouse.Y ) * mouseSensitivity Local deltaY := ( Float(Mouse.X) - _prevMouse.X ) * -mouseSensitivity Entity.RotateY( deltaY ) If firstPersonCamera firstPersonCamera.RotateX( deltaX ) End Else 'initializes _prevMouse only if mouse is clicked and _prevMouse is null If Mouse.ButtonHit( MouseButton.Left ) _prevMouse = New Vec2f( Float( Mouse.X ), Float( Mouse.Y ) ) Mouse.PointerVisible = False End End End

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If firstPerson 'De-initializes mouselook if escape is pressed If Keyboard.KeyHit( Key.Escape ) _prevMouse = Null Mouse.PointerVisible = True End If _prevMouse 'Only starts updating if _prevMouse is initialized Local deltaX := ( Float(Mouse.Y) - _prevMouse.Y ) * mouseSensitivity Local deltaY := ( Float(Mouse.X) - _prevMouse.X ) * -mouseSensitivity Entity.RotateY( deltaY ) If firstPersonCamera firstPersonCamera.RotateX( deltaX ) End Else 'initializes _prevMouse only if mouse is clicked and _prevMouse is null If Mouse.ButtonHit( MouseButton.Left ) _prevMouse = New Vec2f( Float( Mouse.X ), Float( Mouse.Y ) ) Mouse.PointerVisible = False End End End

And at the end of the update, it resets the mouse location like this:

Monkey

Method OnEndUpdate() Override If firstPerson 'Mouse centering. Does not run if _prevMouse is not initialized (first click hasn't happened) If _prevMouse Local threshold := App.ActiveWindow.Height / 10 Local center := New Vec2i( App.ActiveWindow.Width/2, App.ActiveWindow.Height/2 ) Local limit := New Recti( center.X - threshold, center.Y - threshold, center.X + threshold, center.Y + threshold ) If Mouse.X < limit.Left Or Mouse.X > limit.Right Or Mouse.Y < limit.Top Or Mouse.Y > limit.Bottom Mouse.Location = New Vec2i( center.X, center.Y ) End _prevMouse = New Vec2f( Float( Mouse.X ), Float( Mouse.Y ) ) End End End

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Method OnEndUpdate() Override If firstPerson 'Mouse centering. Does not run if _prevMouse is not initialized (first click hasn't happened) If _prevMouse Local threshold := App.ActiveWindow.Height / 10 Local center := New Vec2i( App.ActiveWindow.Width/2, App.ActiveWindow.Height/2 ) Local limit := New Recti( center.X - threshold, center.Y - threshold, center.X + threshold, center.Y + threshold ) If Mouse.X < limit.Left Or Mouse.X > limit.Right Or Mouse.Y < limit.Top Or Mouse.Y > limit.Bottom Mouse.Location = New Vec2i( center.X, center.Y ) End _prevMouse = New Vec2f( Float( Mouse.X ), Float( Mouse.Y ) ) End End End

I’m in the process of cleaning up and rewriting a CharacterController component that can be used in first person games, but the old version is here:
https://github.com/DoctorWhoof/FPSTest

Cheers.

[Author]

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