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3d max object resizing
show user profile  john_000
hi all , i have a ready 3d max block i got it from the net , the unit scale for this object is in feet, i am already working on my project unit is in meter..the question is how can i change the unit of that object to meter so i can use it in my project......

thanks all
read 15553 times
3/8/2009 2:10:49 AM (last edit: 3/8/2009 2:10:49 AM)
show user profile  Dejitarujin
I believe this would be as simple as scaling the object to 30.48%, unless there's some reason scaling would be bad.
Specialty: Non-organic modelling and effects.
Setup: 3D Studio 2010 with finalRender.
Rig: No, no I can't.
read 15549 times
3/8/2009 3:23:42 AM (last edit: 3/8/2009 3:23:42 AM)
show user profile  markoid
If you mean change the Max settings to metric go to 'customise' > unit setup.

read 15545 times
3/8/2009 3:35:11 AM (last edit: 3/8/2009 3:35:11 AM)
show user profile  nm8r
Scaling and Units in 3ds max are very often misunderstood.
You don't need to do any scaling if you have matching Display and Sytem Units setups in the file you're merging.

Open the 3ds max file for the object and go to Customize - Units Setup and Select - Fractional or Decimal Inches in Display Unit Scale and make sure that under System Unit Setup, your System Unit Scale is 1 Unit = 1.0 Inches.
Save the file, Reset 3ds max and go to Customize - Unit Setup again and change your Display and Sytem units to match. If you're using millimeters in display units, use millimeters as well on your System Unit Scale. Now when you merge the object, it will be in the correct size and you don't have to scale the object.

The problem with scaling an object (instead of scaling the Sub-Object - Element) is that the modifier you place after that will also be scaled like a UVW map modifier for example. This could be a problem if you were doing precisely sized maps in architectural or interior work.

If you're importing an illustrator file for example into 3dsmax and you scale that up, when you add an extrude modifier and extrude it, the extrusion will also be scaled due to the linear nature of the modifier stack. On the other hand if you scale the sub-object - spline and later add an extrude modifier, the extrude modifier won't be scaled.

Note: This will only work on 3ds max 2008 or 2009 and not on 3ds max 9. I think that's also the reason for the confusion. Autodesk didn't really get this right until recently.

If you want to test what I mentioned above, create a box in 3dsmax at 39.37"x39.37"x39.37" and make sure that your Display Unit Scale and System Unit Scale are BOTH in inches. Save the file, Reset 3dsmax, change Display Unit Scale and System Units Scale both to millimeters and merge the file of the box you just saved. When you check the size of the box, it will be 999.998mm for Length Width and Height or approximately a 1 meter (LWH) sized cube.

This is another one of those 101 things you never knew in 3ds max even for some experienced max users. I remember a lecturer for Autodesk at Siggraph lecturing about Architectural Visualization (Gary - what's his name?) getting this wrong.

Dejitarjin: How did you arrive at 30.48%?
1 / 25.4 = .0393700787 which would make it 39.37%.
read 15508 times
3/8/2009 3:54:38 PM (last edit: 3/8/2009 6:38:28 PM)
show user profile  Dejitarujin
I calculated that 1 foot is 12 inches; one inch is 2.54 cm; 1 meter is 100cm.

1*12*2.54 = 30.48cm, so one foot should be 0.3048 meter-units, and 100 feet would be 30.48 meter-units. Going from 1 to 0.3048 is a scale of 30.48%.

Since one meter is around 39 inches, and one yard (three feet) is 36 inches, it has to be less than one third (33.3%).
Specialty: Non-organic modelling and effects.
Setup: 3D Studio 2010 with finalRender.
Rig: No, no I can't.
read 15440 times
3/8/2009 7:05:37 PM (last edit: 3/8/2009 7:08:12 PM)
show user profile  nm8r
Dejitarujin: What you're doing then is making what was used to be 1 meter (or 100cm or 1000mm) into an object that becomes .3048 m (or 30.48 cm or 304.8mm) instead and is equal to 1ft. That's not a conversion from one unit to another then but a resizing or rescaling of an object from 1meter to 1ft. What I believe john_000 wants to do is covert units of measurement. Something like a car for example that measures 196" into the equivalent in metric to 497.84cm. In that case, 196/497.85 = .3936928 or about 39.37%. It's a comparison between equal measurements but different units.

I'm not sure if I explained that well but like I said anyway, scaling screws up your model if you add modifiers afterwards.
read 15429 times
3/8/2009 7:42:40 PM (last edit: 3/8/2009 7:57:05 PM)
show user profile  Dejitarujin
He said he has a object that was made in feet, so one unit = 1 foot, that he now has in a scene, where 1 unit = 1 foot. It seems he needs to change the scale of the object so that shrinks to its appropriate size, where one foot is .3048 units instead of one unit, and thus fits in.

I have to deal with that kind of scaling myself sometimes, because when I create a character, it's around 280 generic units tall, and must be converted to real units to be used in a scene.
Specialty: Non-organic modelling and effects.
Setup: 3D Studio 2010 with finalRender.
Rig: No, no I can't.
read 15422 times
3/8/2009 7:53:21 PM (last edit: 3/8/2009 7:53:21 PM)
show user profile  nm8r
To convert inches to centimeters you would multiply by 2.54 so that would be 254% so the inverse of that would be 1/2.54 which would be .3937 and is 39.37%.
Can someone else chime in on this?

Your's is a ratio between 1ft/1meter or 30.48cm/ 100cm and mine is the percentage to multipy when converting centimeters to inches which is what needs to be done if someone wants to scale an object and convert units. Again, like I said that's a bad idea anyway unless scaling the sub-object or merging into another 3ds max file with the correct units.

read 15409 times
3/9/2009 12:08:23 AM (last edit: 3/9/2009 12:41:36 AM)
show user profile  jerome
thanks a lot for those informations.
but I'm still not sure of what i do when merging file.

for example, if you take that free tree sample from evermotion:
(the 1st tree of the vol.58)

Unit Scale is 1unit=1 inch and Display Unit Scale is centimeters.
So the tree is about 9 meters high. (seems over scaled)

If i want to merge it in a scene where Unit Scale is 1 unit = 10 cm, do I have to change something?

read 14257 times
1/25/2010 3:00:30 AM (last edit: 1/25/2010 3:00:30 AM)
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