Object flipping direction when mirrored

[marius e]

Ok, I am having this problem yet again. Seems that when ever I do this it happens.

 

This is what happens, create geometry then use the mirror tool from drop down menu. The moment I ad a uv map and go to select vertices in the geometry, the direction flips.

 

One cant go and ad 'reset Xform' on every single thing. For example I am modeling one half of a building and then mirroring it, but then I have that problem?

 

 

See attached image for problem

[datacrasher]

I don't understand what problem your having! i have copied your image. The only reason why your UVW map moves is because your have the vertices selected if you do make model before you add a UVW map then your model should come out correctly. i think your trying to rust your model instead of taking it slowly

Edited November 1, 2011 by datacrasher

[marius e]

NO no, not the uv that flips its the geometry. The vertices are selected to illustrate the problem, that is where the geometry flips towards.

 

This happens when using the command from the menu bar - tools-mirror.

 

Create geometry-then mirror as a copy, then ad a uvw map to it, then try to select geomatry vertice. Doesnt work.

[erkutacar]

u probably somehow instanced the copy... coz it shouldnt affect the copy no matter what u do to the original model

[marius e]

I have recreated the problem now for many times, everytime I follow the procedure it happens.

[erkutacar]

ok then why dont u just shift+drag to copy the model then mirror it without making a copy? when u drag it to copy, make it a copy not instance! its a very wierd problem to have.. does it happen when u do it in a new file too?

[marius e]

Yes, it always happens, I want to get at the root of the problem once and for all. I have had the problem since max 2008.

 

Erkut, I understand what you mean, my problem is that even if you make a copy it still has the same proble. I recently modeled a building for someone, and only when he started ading uv's he saw that everything flipped. So I need to find what that problem is, if it is a max thing or my procedure. But what I am doing is strait forward!

[erkutacar]

did u check the normals of ur model? maybe its his fault maybe he is flipping when mapping

[marius e]

As mentioned I have recreated the problem here many times, its a max thing, at least in my max haha.

[Scott Dombrowski]

I tried to recreate the problem on my machine, but could not.

 

- Made several boxes.

- Converted one to a poly object, attached the rest.

- Tools/Mirror... copy.

- Apply UVW Map modifier to the mirrored poly object.

 

I'm not sure what your next step is. If I go back in the stack and open the Editable Poly and select some vertices, nothing unexpected happens. If I add an Edit Poly modifier on top of the UVW Map modifier, open it and select vertices, nothing unexpected happens. Can you do a screen recording and upload it to Youtube or something?

[marius e]

Hi Scott

 

Cant do a screen record.

 

I usually use MapScaler (wsm), and that always flips the model, in fact all of the 'world space modifiers' even when ading hair and fur flips the model(once you select vertices after). I started again from scratch with a test scene and the same happaned, except that uvw map did not do the same.

 

Also aded a MapScaler (OSM) modifier and that worked, the model now doesnt flip.

 

Can someone try recreate:

 

1. Make a poly mesh

2. Main menu - tools - mirror (copy)

3. Add to mirror object: Modify - world-space modifiers - Mapscaler (wsm)

4. now go select a vertex on the mirrored object

5. It flips right?

[marius e]

Anybody else wana give it a go?

[Scott Dombrowski]

So yeah, I used a WSM MapScaler and it causes the geometry to flip as you described. I don't know why, but it has something to do with world coordinates versus local coordinates. So the question is, do you specifically need a WSM type of modifier? Can you add just a UVW Map modifier?

[marius e]

Thanks for checking it out Scott. Yes sure, now that I know it is the problem, but up to now it has caused a lot of headaches just to find out that is the problem. Another problem is that using that mirror also flips al the faces around, which I did not even realise, only when I mirrored and attached the mirrored objects to the original, after I sent it of to a client. Will only use the modifier mirror from now on, dont know what is the use of that mirror command then.