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Asked: 2026-06-18T03:30:38+00:00

At the moment I’m achieving a zoom effect in OpenGL by translating the camera

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At the moment I’m achieving a zoom effect in OpenGL by translating the camera position into z direction based on some user input (keyboard functions). Now I’ve looked at several other examples that use zooming and got a little bit confused whether there are different ways of doing this: for example by changing the FOV with glm::perspective. Is there a difference between changing The fov and my z-translation, and if so, which way is better? What I also don’t really understand is when to use glm::scale in the context of zooming, since I’m not using this either.

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  1. Editorial Team

    I’m achieving a zoom effect in OpenGL by translating the camera position into z direction

    That’s not Zoom, that’s Dolly. Zooming is the variation of the field of view, i.e. a change of the projection parameters.

    and if so, which way is better?

    Neither, they’re completely different movements. You can combine Dolly and Zoom to achieve that Dolly-Zoom Alfred Hitchcock got famous for. See this site for a list of camera movements:

    http://www.mediacollege.com/video/shots/movement.html

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