Question about using cut on a polygon.

[tranngochungdevwannabe]

Im new to 3dsmx and have some confuse with using cut on a polygon of an Element.

Step I did:

1. Creat rectangle.

2. Use modify edit poly.

3. Choose polygon -> choose cut.

4. When I click on the surface, it alway auto generate edge that connect from the point I click to the vertex on the border of that polygon (in the pics they are edge x). Why is that? Can I just cut it like cutting a cake? Why extra edge have to appear?

5. When I switch to edge and choose (u can see which edge I mean in the pics) a or b or c or combination of any  of them and click 'remove', it remove all a,b,c, x. How to remove only the edges I choosed?

    Also if I choose edge x, then click 'remove', nothing happen. Can I remove edge x? How?

6. If I choose polygon Z, then click button 'delete' on keyboard (since there is no 'remove' function that I can choose for polygon. Why edge have this function but poly dont have?), then click on l or m or n or combination of them, then click 'remove', nothing happen. This behave differrent with a,b,c , was edge a,b,c deleted with polygon Z? 

    Still, now when I click edge x, and click 'remove', nothing happen. How can I remove this edge x? Why it have to appear in the first place?

7. Also, when u guys create new edge(s) for object using edit poly modify, did u use 'cut' or something else?

   I tried to use: in edge mode -> Edit Geometry: 'create', but it only can creat line from a pre-exist vertex to a pre-exist vertex. 

   I try 'insert vertex' (still edge mode) but it can only create vertex on a pre-exist edge, also after that I use: in edge mode -> Edit Geometry: 'create', resuilt is only from some vertex that I can create edge, some cant. 

   Also if I use vertex mode: -> Edit Geometry: 'create' to create vertex, then switch to edge mode to create edge, I cant click to those vertex at all. 

Im clearly using this app wrong :))) 

I use 3ds max 2021.

[ahmadhossain50]

Cut tool is sensitive tool. If there is no segment, it creates auto segment. If you draw triangle on a plane, for example you create a plane with 1 by 1 segment. Then, you draw triangle, you get automatic segment because the software is designed like that and without segment you cannot control the triangle in many cases. I just upload a photo. Actually, Segment controls the smoothness of a surface of a geometry and Segment also helps to an object to make real. If you look realistic model, Modeler controls segment properly. A Good modeler means who knows good segment control.  Cut tool also uses to control segment. If there is Segment, Cut tool will not create automatic segment. There are two photos.