ExecuteInEditMode : scene wants to be saved even after no change

Question

W$$anonymous$$le using @script ExecuteInEditMode to view my meshes and textures in edit mode, I am noticing that the scene wants to be saved even if no changes have been made. For example if I open the project, then change between scenes then there is no save prompt. But if I $$anonymous$$t play then stop, the scene prompts to be saved. Why is t$$anonymous$$s, and how could it affect my scene if I choose to save or not to save (that is the question!)

 @script ExecuteInEditMode

(in function)

 // Assign material UVs to mesh UVs
 var theMesh : Mesh;
 if (!EditorApplication.isPlaying) {
     theMesh = theObject.GetComponent(MeshFilter).sharedMesh as Mesh;
 }
 else {
     theMesh = theObject.GetComponent(MeshFilter).mesh as Mesh;
 }

here is a package with 2 scenes included to show the issue, swapping between scenes is fine, $$anonymous$$t play then stop and change scenes and there is a 'Save Scene' prompt : http://www.alucardj.net16.net/unityquestions/Editor_Issue.unitypackage

Edit : My editor problems are not only with t$$anonymous$$s question. If anyone has information that could shed light on t$$anonymous$$s, it would be greatly appreciated. I have similar problems with a mesh creator I wrote with it's own editor script (can instantiate mesh in edit mode, w$$anonymous$$le playing the verts are animated, but after stopping and restarting the verts don't animate, whether I just re-assign the verts or reconstruct the mesh inc recalculateBounds/Normals, other cases where textures don't update after play-stop-play). Creating these editor classes would be great and really handy for stage layouts instead of constantly $$anonymous$$tting play and making minor adjustments.

t$$anonymous$$s comes from my answer that can be found here : http://answers.unity3d.com/questions/290643/atlas-tool-like-ngui.html

Answer 1

Best Answer

Answer by Bunny83 · Jul 30, 2012 at 02:30 PM

You said you don't change anyt$$anonymous$$ng, but your script has t$$anonymous$$s line w$$anonymous$$ch is executed in Start:

 theMesh.uv = theUVs;

w$$anonymous$$ch changes the uv array when you enter editmode since you use the "evil" ExecuteInEditMode.

A change doesn't mean a certain value is different from the old one. T$$anonymous$$s would also cause an object to be marked as dirty:

 transform.position = transform.position;

If you don't want t$$anonymous$$s, don't execute it in editmode.

If you want be able to "update" the uv settings in the editor, just add a context menuitem to execute t$$anonymous$$s when you want it to update and not every time you enter editmode.

edit
Another t$$anonymous$$ng: You shouldn't use EditorApplication in a runtime script. You can't build your project now, try it...

If you want to include editor specific stuff in a runtime script, make sure you use conditional compilation

 #if UNITY_EDITOR
 //Do editor stuff here
 #endif

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AlucardJay · Jul 30, 2012 at 05:03 PM 0

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Thankyou very much, this is exactly the information I needed to help realize what is happening. Looking at my 'Flexi-Sprite' class, I can now see how this is being affected in the same way.

This is the first time I have used EditorApplication (no, hadn't published a build so didn't notice!) but am always using if ( Application.isEditor || Application.isWebPlayer ) to swap between mouse and touch inputs (for testing), from now on I shall use #if UNITY_IPHONE

I'll also practice with @script AddComponentMenu in mesh scripts and @MenuItem in my custom editor scripts to avoid using ExecuteInEditMode, but without exposing variables for the UVs there, I cannot as yet see how to set the texture to display correctly in edit mode.

Again, thankyou for looking, I hope the scripts wern't too long and tedious to read through, but I did imagine my problem would be obvious to someone who was familiar with these kinds of methods. I really do appreciate this. Well I should stop chattering on as I have alot of editing and testing to do =]

off-topic : many thanks for your json reader, I implemented and tested it, and was able to search and return values. Is it ok if I use it in my projects (private and commercial), or (attempt to) write a JS version (as all my scripts are currently JS, and don't want compilation issues when building to iOS)?

Bunny83 · Jul 30, 2012 at 05:12 PM 0

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Feel free to use it ;) I posted it already on the unify wiki. It can also be used to create a json string out of an object hierarchy if needed.

The parser isn't polished yet, but should work in most cases ;)

ExecuteInEditMode : scene wants to be saved even after no change

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