Scale factor in unity?

Unity Engine
1

Sorry for the noobish questions here but Im having some trouble getting my assets into unity.

First off, I am making a modular factory scene and I have about 12 reusable pieces.

  1. How would I go about UVWing a modular scene?
  2. What scale factor in Maya do I use? (and how do I change it?)
  3. How do I change the importing scale factor in unity? (my objects are either HUGE or TINY in unity)
  4. How do I snap align objects by the corners in unity? (it’s a modular scene…)

Thanks!

2

  1. You’ll probably want to UV Unwrap each reusable piece separately. This will totally depend on how you use your textures (tiled vs full textures, etc.).

  2. I’m not super familiar with Maya, but I believe it’s going to depend on what unit of measure you use. Try using Meters in Maya… if you’ve already created your models with a different unity of measure, use the FBX Exporter and set the units to Meters.

  3. When you import your model, you can set the scale factor. If you’ve done step 2 above, try setting it to “1” and see what happens. It’s really going to depend on how many units you used when you made your models. If you’ve already imported, just select your model in the project window and change the settings in the inspector I believe.

  4. Not sure on this one.

3

#2 Im using meters, and Im assuming each grid block is a meter in maya? If so, the building is realistically scaled, but in unity its almost 50 times larger.
#3 Where do I change the scale factor for importing?

I guess what Im asking is how tall is a character in Unity and how does that exact measurement translate into maya?

4

Try using Centimeters in Maya then.

See this screen… model is selected in project pane… Scale Factor is on the right in “Inspector”

1382200--70433--$scaleFactor.png
1382200--70433--$scaleFactor.png784×652 63.2 KB

5

I’m wading through this issue myself at the moment.

It seems to be slightly different depending on what format you export to.

I set mayas scale to 1 metre. This makes it easier to work with zbrush and maya, and nominally (for shadows/lod and stuff) Unity seems to think in meters although I’ve read elsewhere that it’s unitless.

For exporting objs this works fine, objs seem to import straight in.

However, for fbx files it gets more complicated, especially if the model is rigged. I posted a message about it here.

http://forum.unity3d.com/threads/204442-Rigged-fbx-from-Maya-corruption-when-units-set-to-one-metre

The method that seems to work is. When exporting via fbx with a rigged model. In the export dialogue, you must set units to centimetres, then when you get into Unity, as posted above, set the scale factor to 1.

edit. Oh and to set units in Maya its Window>Settings/Peferences>Preferences>Settings>Working units>linear

6

I generally use Blender which is also ‘unitless’. 1 Blender unit is 1 Unity unit and it seems to work well though I haven’t done anything too complex. I know there have been a lot of questions around Maya units and I believe you do have to use centimeters. You can also leave it at meters and import with a scale factor of 0.1 (the default), but I believe that may have an effect on physics and possibly animation as well.