When using 3DS Max, note that reflections are not exported in OBJ. Use the DAE format instead.
Open Compact Material Editor.
2. With the picker tool, click on the material that you wish to change (on the object) : it will be selected in the material editor.
3. Open the material’s “Maps” menu.
4. Tick the reflection box and adjust it to obtain the wanted reflection.
Ex: 0 the reflection is non-existant, the material will be matte.
At 100, the material is very reflective.