I use this script http://www.scriptspot.com/3ds-max/scripts/instance-replace
I replace many objects with instanceReplace

The problem: A few objects flips (like mirror). Or the object rotate?

Here a test script:

The output is:

OK
DumpObjInfo()
ResetAll()
$Editable_Poly:oben @ [0.000000,-0.000011,3.360594]
$Editable_Poly:unten @ [0.000000,-0.000011,1.142553]
____________________________________________
DumpObjInfo for object: $Editable_Poly:oben @ [0.000000,-0.000011,3.360594]
transform: (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,3.36059])
rotation : (quat -0.5 -0.5 0.5 0.5)
pivot : [0,-1.10865e-005,3.36059]
objectoffsetpos : [0,0,0]
objectoffsetrot : (quat 0 0 0 1)
objectoffsetscale: [1,1,1]
objecttransform : (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,3.36059])
OK
____________________________________________
DumpObjInfo for object: $Editable_Poly:unten @ [0.000000,-0.000011,1.142553]
transform: (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,1.14255])
rotation : (quat -0.5 -0.5 0.5 0.5)
pivot : [0,-1.10865e-005,1.14255]
objectoffsetpos : [0,0,0]
objectoffsetrot : (quat 0 0 0 1)
objectoffsetscale: [1,1,1]
objecttransform : (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,1.14255])
OK
------------------------------------------------------OK
$Editable_Poly:oben @ [0.000000,-0.000011,3.360594]
------------------------------------------------------OK
____________________________________________
DumpObjInfo for object: $Editable_Poly:oben @ [0.000000,-0.000011,3.360594]
transform: (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,3.36059])
rotation : (quat -0.5 -0.5 0.5 0.5)
pivot : [0,-1.10865e-005,3.36059]
objectoffsetpos : [0,0,0]
objectoffsetrot : (quat 0 0 0 1)
objectoffsetscale: [1,1,1]
objecttransform : (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,3.36059])
OK
____________________________________________
DumpObjInfo for object: $Editable_Poly:unten @ [0.000000,-0.000011,1.142553]
transform: (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,1.14255])
rotation : (quat -0.5 -0.5 0.5 0.5)
pivot : [0,-1.10865e-005,1.14255]
objectoffsetpos : [0,0,0]
objectoffsetrot : (quat 0 0 0 1)
objectoffsetscale: [1,1,1]
objecttransform : (matrix3 [0,1,0] [1.62921e-007,0,-1] [-1,0,-1.62921e-007] [0,-1.10865e-005,1.14255])
OK

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It makes sense, notice the transforms for both objects is the same (except the vertical position). When you do instance replace it replaces the object. In this case the object is flipped in the object stack (base object or modifier), and not in the transformation.

-Eric

Eric Craft
“The Evil Monkey hiding in your closet.”

Yes. The Problem is, the object geometry is flipped “internal” and not the transformation of the object.

Is there is any changes to handle this in a script???

Yeah, I’m interested if you can replace only the mesh, but not affect the nodes transform.  So the mesh is instanced, but it would keep the pos/rot/scale intact.

Right now my make instance of tool sort of does this, but sometimes the object will move from where it was after making it an instance of another object.  Not sure why it only does it sometimes…