Mirror Object in GMAX

#1
I've been running into a problem with objects I clone using the Mirror function in GMAX when trying to create a "flipped" or reversed version of the original. Although the resulting object's normals appear correctly in the viewport, when it is placed in FS9, it appears "inside out" - the normals have been flipped in the final.

The behavior is consistant, even when used to flip a spline (athough the rollout spline mirror tool does not result in this behavior). I have tested this by flipping the normals on the model in the GMAX viewport so the faces of the object face inward and exporting it into FS9. As before, it comes out reversed in FS9 (the object appearing correctly).

Clearly, I would prefer building a complex model in GMAX with all the normals facing they way I expect it to appear in FS9.

My best guess is that there's some setting I've missed or messed up- but at this point, I'v exhausted my knowledge of GMAX. :banghead:

I would appreciate any help.

thanks

Brien
 
#2
Very funny, indeed....

Hi Brien, and everybody else of course.
It's very funny (indeed) that I've just registred to this forum 'cause I have the same problem as your and I was expecting to find an answer here, but it happens 'till now I've found only the question already made... :) . And it's much boring to be compelled to re-model something that would be easly done just by mirroring or flipping some other object, only because makemdl or bglcomp are probably unable to manage with mirrored or flipped surfaces. I really hope there is a solution for this :confused:
Thaks for any advice.

Ciao, Lib.
 
#4
Hi Guys

I take it you are using the 'Mirror Selected Objects' button on the tool bar, if so, this does indeed flip the normals when viewed in FS9. Instead of using this, select the object you want to mirror, then go into the modify tab and choose 'mirror' from the drop down menu, you can then tick copy, you also may need to change the mirror axis. Now set the Offset. I always use this and have never had any problems with flipped normals in FS9.

hope it helps

Stevo :)
 

connomar

Resource contributor
#8
Having mirrored an object, is there a way of splitting the object back into two? I want to create opening doors - think French Doors in a house - but once mirrored, it seems to become a single entity.
 
#9
Having mirrored an object, is there a way of splitting the object back into two? I want to create opening doors - think French Doors in a house - but once mirrored, it seems to become a single entity.
You can group the elements, mirror and then ungroup.
 

hairyspin

Resource contributor
#10
You can group the elements, mirror and then ungroup.
Um, Groups are best avoided. Having used a mirror modifier, add an Edit Mesh modifier or collapse the stack, then select the Element sub-object you want separated and Detach as an object.
 
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#12
I like to make a fuselage all in 'one side', then double it, weld it, and brake the doors and windows loose. Same for wings. Do one side, then mirror it, brake the parts loose and animate them then. Same for mapping. Get it all mapped, then duplicate and mirror. Half your work is done. At least for the wings and landing gear. The fuselage, you almost want to map it with the other half mirrored already.

I never animate doors before mapping, these days. I can, but I attach the doors and then map, then re-detach and animate (again) so that the mapping is extreme precision and not all messed up.
 
#13
I dont know if Gmax has it, but in Max, you have 'Symmetry' where you can view the other side of the fuselage as you make the first side. Gives you a better idea how its going. Mirror works also, I guess. With Symmetry, you can turn it on and off with the Space bar on the keyboard. Also, you can build the model in basic mesh and use NURMS or Mesh Smooth to 'auto smooth it' to see how its looking in proper smoothed mode. Just have to be careful with polygon counts.
 

hairyspin

Resource contributor
#14
Bill, you should know better, lol! That's why you saved so long for Max, to get these better tools. Even my old Max 2008 has Symmetry, but not Gmax.
 
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