I created a scene with Blender. This scene has been exported to obj and mtl files
and imported into three js with the OBL / MTL loader. So far so good, the scene is being integrated.
But, how do I set the Camera parameters in Three js, so that in Three js the scene is shown in the same sizes as in the Blender?
You can create a camera in blender, then either copy the parameters, such as position and rotation, into your camera in three.js. Or, you can export the camera and use it directly. However I don’t think that OBJ supports cameras, so you’ll need to use glTF format instead.