Finding the center of a Three.js Scene

I'm trying to find the center of a Scene that I've loaded using ColladaLoader in Three.js. Once I have the center, I want to set it as the target for the Camera.

Answer №1

@gaitat's solution may be effective if the model's origin coincides with its center, but this scenario is unlikely. The origin of a model could be located in various positions such as the bottom left corner or the middle of the top plane, which have no correlation to the actual "center" of the model.

To determine the center of a model, it is necessary to calculate it based on its geometry. Luckily, THREE.Geometry offers helpful methods for this task. By computing the "bounding sphere" of the geometry, you can find the smallest sphere that encloses all points of the geometry. The center of this bounding sphere will then represent the overall "center" of the geometry.

var mesh; // ideally referencing the mesh of your model
          // may be nested within the DAE object

mesh.geometry.computeBoundingSphere(); // remember to manually trigger this computation

mesh.geometry.boundingSphere.center; // Provides the center position as a THREE.Vector3

It is uncertain whether the world matrix transformation needs to be applied to the resulting boundingSphere.center, but this approach serves as a starting point.

Keep in mind that the bounding sphere calculation does not consider the dispersion of points within the geometry. A single outlier point positioned far from others can affect the center of the bounding sphere as it adjusts to encompass all points. Nonetheless, using the bounding sphere method is quick and straightforward, suitable for most scenarios.

Answer №2

To ensure the camera aligns with the scene, employ the command camera.lookAt(scene.position);

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