There are several ways to do this. (BTW you should share minimal complete code of your example for other's to be able to help you efficiently).
1. Publish in Wolfram Cloud
Method bottomline: very simple and fast, does not need any software, works in a web browser even on mobile, but requires internet
Interactivity you have in Wolfram notebooks, from 3D graphics to
Manipulate interfaces, etc. can be shared with other via publishing in Wolfram Cloud. Here is a simple example that you can check at https://wolfr.am/Sig1yEVu In this way not only your colleagues can get to rotate the cow, but also it is possible to add interactive interfaces.
You can also publish the whole notebook. Ultimately you can take advantage of Wolfram Notebook Embedder and use it on personal websites (like for instance Wolfram Community is already doing, see many posts in http://wolfr.am/StaffPicks ). Make sure you understand Wolfram Cloud Credits system. Also check PermissionsGroup and CloudDeploy for flexible options on sharing permissions and access.
2. Free Wolfram Player
Method bottomline: high level of interactivity, iOS compatible, no need for internet, but requires FREE software installation.
If your colleagues are OK to install FREE Wolfram Player, which is very simple too, then your problem is solved by simply sending them the notebook. They will not be able to evaluate the code, but all interactivity will be available to them. The notebook will even open and work on a mobile iOS device, which I use a lot btw when for example someone sends me an email with a notebook and I am traveling.
3. Export 3D object to external service or format
Study docs around function Printout3D and related functions HERE. It can help you to use external service or file format (like .STL) to share 3D-interactive objects, for example:
which you can check out here: https://bit.ly/388bpIs