Adjust THREE.js Orthographic camera to perfectly match the scene dimensions

After scouring numerous questions on stack overflow, I have yet to find a solution to my current issue.

Within my scene, I have a large collection of Object3D's that are constantly changing, all being viewed by an orthographic camera head-on.

What I am in search of is a straightforward function that, upon invocation, will adjust the top/left/bottom/right/zoom properties of the Orthographic camera to perfectly fit the Object3D group.

I've experimented with different approaches, but none have proven successful enough to share. It seems like a fresh perspective is needed at this point. While I've come across suggestions about adjusting the camera's fov based on the distance from the object's bounding box face to the camera for perspective cameras, implementing this with an orthographic camera has been challenging as the fov property doesn't seem compatible. Though, it might actually work and I just haven't discovered how.

While I hesitate to request code directly, I am hopeful for a function that can automatically fine-tune the necessary properties of the Orthographic camera to suit the specified object parameter. For instance:

function fitOrthographicCameraToObject3DGroup(group) {
    // your implementation here
}
javascriptcamerathree.js

Answer №1

Find the bounding box dimensions of your 3D model and insert the following code snippet. I found success with this method

        var camera = new THREE.OrthographicCamera(container.offsetWidth / -2, container.offsetWidth / 2, container.offsetHeight / 2, container.offsetHeight / -2, 100, 100000);

        // Centering the meshGroup
            var box = new THREE.Box3().setFromObject(meshGroup);
            box.center(meshGroup.position);
            meshGroup.localToWorld(box);
            meshGroup.position.multiplyScalar(-1);

       // Ensuring the object fits the screen when using an orthographic camera
    
           camera.zoom = Math.min(container.offsetWidth / (box.max.x - box.min.x),
                container.offsetHeight / (box.max.y - box.min.y)) * 0.4;
           camera.updateProjectionMatrix();
           camera.updateMatrix();

Answer №2

Adjusting the position of the orthographic camera based on the bounding box dimensions is a simple task. Calculate the half lengths of the bounding box and use them to set the top, left, bottom, and right parameters.

The real challenge lies in managing the zoom level. To tackle this, you can constrain your scene within a unit cube by scaling it up or down according to the size of the bounding box. This approach eliminates the need to worry about zooming, resulting in standardized top, left, bottom, and right values of 0.5, 0.5, -0.5, and -0.5 respectively.

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