The camera position according to the scale of the mesh

[Dad72]

Hello,

 

How to keep the camera or to a position sufficiently away so that an object is completely visible by its scale.

Some very large object that makes the camera is found on the inside of the object and I would like to reposition the camera so that the object is seen entirely.

 

How to do ? This is for a mesh explorer (a mesh viewer)

 

Thanks for your help.

[JCPalmer]

The only easy way I think is with an ortho camera,  where distance from camera has no meaning unless really close to 0 / negative, or way too far away.  Not sure this will work for you though.

[Dad72]

Thank you JC. I like to keep the rotating camera for rotation around the object. The ortho camera is fixed.

[JCPalmer]

Ortho is not fixed position / direction.  It is not even really a camera.  It is a mode.

cam.mode = BABYLON.Camera.ORTHOGRAPHIC_CAMERA;

I tried a playground with an ArcRotateCamera & ortho turned on.  The camera was set way back.  I do not know why, but it did rotate.  Maybe if you can find how to ortho is working here you might make it work.

 

Playground, ortho commented out

[Dad72]

I'm going to try. Thank you JC

[Dad72]

It does not work. whatever the size of the object, the camera still has the same radius.

If I put the sphere has a size of 20, the camera is in the interior of the sphere.

Also the prospect seems strange compared to the normal mode of the camera.

 

http://babylonjs-playground.com/#1UMSDF#1

[Convergence]

http://www.babylonjs-playground.com/#1IFIES#0

 

Little crude, to make it a bit more sleek you could do something with camera.fov and trigonometry

[Temechon]

Convergence's solution is good. I would do exactly the same.

[Dad72]

Convergence thank you, this is a good solution.

[Dad72]

I improve the stage in the event of a change of scale. And boundingSphere.radiusWorld and seems to work better

var size = sphere.getBoundingInfo().boundingSphere.radiusWorld;camera.radius = size * 3.6;camera.setTarget(new BABYLON.Vector3(0, size / 2, 0));

http://www.babylonjs-playground.com/#1IFIES#1