Using millimeters to move object

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Hey there,

I know that Unity uses units and not exact meters, centimeters or millimeters for measruement, or better said: the units might be what I want (as long as it doesn't get to physics), but for my prject I need to move different objects in an exact range of millimeters. So let's say my object has a size of 5m x 3m x 2m, I need to move another object exactly 5cm on the xAxis of the object. How can I manage this? Sounds ridiculous, but the issue is, that by importing the fbx, unity sets every value to 1 (so the size of the object is 1 x 1 x 1) or to the scale the object has in the 3d modeling tool (for example 10), so my measurements are lost... Maybe I'm just missing something? Would be thankful for every help! :)

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Answer by Andres-Fernandez · Jan 27, 2015 at 11:49 AM

Unity scales the object (actually scales the mesh when importing) differently depending on the format (for example .fbx has a 0.01 scale factor and .3ds has a 0.1 factor). Check the docs here.

What you need to figure out is your scale and then move the object according to that.

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CodingNoob · Jan 27, 2015 at 01:32 PM 0

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Thank you!

I found the option and set the scale to 1, but the movement still didn't work out as intended. I don't know what didn't work as I wanted, but the object's position wasn't changed in Relation to the world, but to the parent or something. But: The scale was right, so that 1 unit equals the unit I want (mm), so I just created an empty object and set it as parent of the object I wanted to move, and now it works...somehow o.O

Andres-Fernandez · Jan 27, 2015 at 02:21 PM 0

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You usually set the scale factor to fit Unity units (which is considered 1 meter). You can easily check that by adding a cube to the scene and comparing it to your model. If your model is 1 meter tall it should be 1 cube tall, 2 meter tall should be 2 cubes tall, 3 meters tall equals 3 cubes tall and so on. If your model fits that, then you can move a milimeter by moving 0,001 units.

CodingNoob · Jan 27, 2015 at 02:38 PM 0

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I'll check that! Thank you very much for your help! :)

Using millimeters to move object

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