Using 2 versions of Unity, old project only wants to load in Unity 4

Unity Engine
1

Hi All,
I have 2 projects going on. One is in Unity 3.5 the other is in Unity 4. It’s important that I keep my Unity3 project in that version. Now, when i try to open the project it will, by default try and open in 4. Even when I browse to the scene file and try to tell it to open with the 3.5 exe it still tries to open it in Unity4. I’ve tried everything i can think of… But for now I cant open it. Anyone have any thoughts how I can just open unity3.5 but tell it which project to open? Any ideas would be helpful.

Thanks.

2

Open the Unity 3 directly (from the Unity.exe) not by clicking a scene file or something.

3

The problem is that unity 3 and 4 does use the same place to remember the last project.

You can for unity by giving a non existing project to ask for what to load.
Just make a copy of our unity Link and edit the target like this.

“C:\Program Files (x86)\Unity4\Editor\Unity.exe” -projectPath ~/UnityProjects/

4

Well, at least with ‘always show project wizard’ option it has different lists of projects on both version of Unity.

5

Hi Malzbier,
Thanks for the tip… Although, I’m not entirely sure what you’re suggesting… I’m not entirely sure what the “unity Link” is. Sorry… I’m an artist… haha. Are you referring to the link.xml in the tools directory? That was the only file named Link that I found.
The worst part is now Unity 3.5 only wants to open my 4.0 project… and 4 only wants to open my 3.5 project… stuck in a vicious loop…

6

If you are on OSX, just alt-click the Unity 3.5 icon and the open project dialog pops up first.

7

Nope… using Windows…

8

True… I managed to get 4 open without opening the 3.5 project. So for 4 I was able to turn the project wizard on… But 3.5 only wants to open my Unity 4 project, and I cant think of a way to change it… So, at the moment i can use 3.5 without risking the contents of the Unity4 project… Getting frustrated.

9

The trick is To force unity via the command line arguments to open a specific project. If the project that i force Unity to open does not exist, unity ask me with the project wizard what project to load.