How to get the rawData with a minMax value?

#### Description
Hello, I'm trying to get the bones of a CT, I know I can change the threshold and it will change the stack.minMax value and it will affect to the 2d render, but I want to change the 3d render in order to export that values a get just the bones.

This is the values I want to export:

However when I load the volume, it doesn´t have a threshold property and the only way to get the bones are changing the windowWidth and the windowCenter:


to this:


So my question is:

**How can I get just the bones in the volume and export that values?**

Because I want to transform that values into a mesh using marchingcubes.
Thank you.

#### Browsers Affected
- [x] All
- [ ] Chrome
- [ ] Firefox
- [ ] Edge
- [ ] Safari 9
- [ ] Safari 8
- [ ] IE 11

### Versions
- AMI: v0.32.0
- THREEJS: v107