3ds max Polygon Modeling Reflecting objects with Mirror so I'm actually propagating those changes to the reflection. Alright, so I don't actually need to do any edits, it's fine as it is, so I'm going to undo that with the undo button up here and then exit out of sub-object mode, go up to the top level of the mirror, and we can just convert this to Editable Poly and then attach it to the other half of the chair leg. Right-click, Convert To, Convert to Editable Poly, and it's no longer a reference.
3ds max Polygon Modeling Reflecting objects with Mirror It has no connection to the other object, and now we can actually attach the two together. If they were instanced or referenced, we wouldn't be able to make that attachment. Select the original object, chair base leg. We want to find the attach button. Here it is on the modeling ribbon. Click Attach, and then click on the other object. Now they're both part of that same object. We can click Attach again to turn that tool off. And, we have an open border here between the two. We're going to weld that later to close up that seam, but for now they're two separate elements within this one object. And, if we go into element sub-object mode, we can select one or the other elements, just to show that they are not connected, they're not part of the same polygon shell. Exit out of sub-object element, and that's how to use the mirror tool to reflect geometry.
