3Ds Max Help

[frozen]

for starters, once you finish your model, make sure you weld it together. this will take care of unjoined/unconnected vertices. as nighthawk pointed out, your problem is most probably that.

in order to do so, (this is the step i do), right click on the object in any viewport, go to the option "convert to", next expansion, there will be an option called "convert to editable poly". select that. this will allow you to edit your mesh. keeping your model selected, go in to vertex mode (on the right side, there will be a option called editable poly which can be extended, expand it and select vertex as the option, highlighting it), press control + a (select all) in viewport, selecting all your vertices, then press the button next to the weld button that looks like a tiny window. this opens a new window, allowing you to change the threshold value. leave it as default and hit apply, then ok. that should weld your vertices together. if you have floating vertices that are not connected to the model in anyway, you may have to remove them manually. pressing the "7" key in one of the viewports will give you a poly and vertex count, allowing you to work accordingly.

another key point. do not model both sides. do either 1 side, then mirror it onto the other side to maintain symmetry, unless your going for an asymmetric design.

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