What is required to convert threejs perspective camera to orthographic

Questions
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1

I have code that converts a perspective camera to an orthographic camera. The problem is when i convert them the model become very tiny and hard to see.

I have calculated the zoom factor for the orthographic camera based on the distance and FOV. Are there any other properties i need to set on the orthographic camera. i.e clipping plane, etc… i believe the position remains the same. I’m not sure what else i need to calculate.

if (cameraType === "Perspective") {
  //calculate  zoom Factor by calculating distance of object from camera and perspective cameras FOV
  //create threejs orthographic camera
  // set camera on scene --- my model is shifted very far and becomes hard to see
}

I also tried setting the same camera properties i.e clipping planes etc of the perspective for the orthographic and i still had the same problem. I guess i am missing some property or calculation required to put the object in the same position as it was when it is in perspective camera view.

2

It would help if you shared your code. Also have a look at
https://threejs.org/examples/#webgl_camera

3

You can check out how CombinedCamera solved this problem:

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