Non-linear zoom scaling in Three.js OrbitControls.js

Let's dive into the world of this library I'm referring to: https://github.com/mrdoob/three.js/blob/dev/examples/js/controls/OrbitControls.js
I've encountered a question that is puzzling me: The zoom functionality seems elusive to me. It adjusts relative to the distance between the camera and a reference point, yet the exact definition remains hidden.
After ruling out lines 31-33 and the getZoomScale() function (line 276), along with various other sections dedicated to different events, I'm still at a loss.
Is there someone who has delved into this before and may have an inkling as to where the zoom logic resides?
Alternatively, is there a method to customize the zoom scale to a predetermined value rather than its current behavior?

javascriptthree.js

Answer №1

When working in 3D development, a camera plays a crucial role in defining the perspective of the scene. Through parameters like distance, angle, and field of view, the camera transforms the 3D environment into a 2D representation during rendering. It holds position and rotation data stored in vectors, matrices, or quaternions.

Controls, such as Orbit Control examples, facilitate user interaction by allowing movement around the camera based on events like mouse input. In the context of orbit controls, the camera acts as if tethered to a central point, enabling smooth movement along a projected sphere at a set radius.

In specific lines of code within the sample orbit control, you can observe how the camera is utilized and manipulated to accommodate various settings and behaviors. For instance, the concept of zooming is evident through assigned values that can be reset when needed. The update function dynamically repositions the camera based on user input, adjusting its orientation accordingly.

To establish an initial configuration for the camera, including its position and orientation, one can leverage functions like 'lookAt' to specify where the camera should focus within the scene. By setting up the camera object and applying appropriate controls, developers can enhance the overall visualization experience in their projects.

For further information and resources, the GitHub Wiki page serves as a valuable reference guide: Home

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