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Question by frank · Sep 07, 2010 at 02:14 PM · zoommousewheel

How to Zoom in/out using the mouse wheel?

Hi, all! I cant figure it out how to zoom in or out a perspective camera using the mouse wheel. Is there anyone could help?

THX!

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Answer by Jesse Anders · Sep 07, 2010 at 03:16 PM

Are you referring to an in-game camera?

For a perspective projection, zoom is usually effected by modifying the field of view. The camera field of view can be modified directly via scripting, so what you would most likely want to do here is increase or decrease the field of view as appropriate in response to mouse wheel events, while keeping it constrained to some reasonable range.

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avatar image frank · Sep 07, 2010 at 03:53 PM 0
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Hiis there any function or something could change the field of view in the script?

avatar image Jesse Anders · Sep 07, 2010 at 05:42 PM 0
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All you need to do is assign a new value to the camera's 'field of view' variable (e.g. 'camera.fieldOfView = 60f').

avatar image frank · Sep 08, 2010 at 12:39 AM 0
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THX, I've made it.

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Answer by Vimalakirti · Sep 07, 2010 at 03:12 PM

You'll need to set up your variables distance and zoomRate, and it depends on your specific camera script, but it will go something like this:

    // Middle ScrollWheel for Distance / Zoom
if(Input.GetAxis("Mouse ScrollWheel") != 0.0)
{
    distance -= (Input.GetAxis("Mouse ScrollWheel") * Time.deltaTime) * zoomRate * Mathf.Abs(distance);

}

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avatar image Eric5h5 · Sep 07, 2010 at 09:18 PM 0
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Scrollwheel movement is already framerate-independent, so multiplying by Time.deltaTime is a bad thing and does the opposite of what you intend.

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