How can I change default animation curve from ease in/out to linear?

Unfortunately ease in/out is a hard-coded default.

 

Bugs can upvoted in the issue tracker. (https://issuetracker.unity3d.com/), but since this can be considered a feature request, this the best place to post it. It gives the timeline the most visibility.

Can you provide your use case? No promises that it can or will be implemented anytime soon, but a clear reason why the feature is important always helps prioritize it.

 

Great! Thank you, that's excellent feedback.

 

Unfortunately there hasn't been any work to address this and there is nothing planned in the near term to address it.

Timeline 1.4 does have 'actions', which allows you add custom commands to the menu, including keyboard shortcuts. For example, here's a script for an action you can drop in that would change all blends to linear on selected clips and tracks, either via the menu, or using the a keypress of 'B'.

It's not exactly the fix you are looking for (changing defaults), but hopefully it helps.

Code (CSharp):

1. using System.Linq;
2. using UnityEditor.Timeline;
3. using UnityEngine;
4. using UnityEditor.Timeline.Actions;
5. using UnityEngine.Timeline;
6.  
7.  
8. [ApplyDefaultUndo]
9. [MenuEntry("Blends/Set To Linear", MenuPriority.TimelineActionSection.matchContent + 1)]
10. public class BlendsToLinearAction : TimelineAction
11. {
12.     public override ActionValidity Validate(ActionContext context)
13.     {
14.         if (context.clips.Any())
15.             return ActionValidity.Valid;
16.  
17.         // a selected track with a clip
18.         if (context.tracks.Any(t => t.GetClips().Any()))
19.             return ActionValidity.Valid;
20.  
21.         // grey out the menu
22.         return ActionValidity.Invalid;
23.     }
24.  
25.     public override bool Execute(ActionContext context)
26.     {
27.         foreach (var t in context.tracks)
28.         {
29.             foreach (var c in t.GetClips())
30.             {
31.                 c.blendInCurveMode = TimelineClip.BlendCurveMode.Manual;
32.                 c.blendOutCurveMode = TimelineClip.BlendCurveMode.Manual;
33.                 c.mixInCurve = AnimationCurve.Linear(0,0,1,1);
34.                 c.mixOutCurve = AnimationCurve.Linear(0, 1, 1, 0);
35.             }
36.         }
37.  
38.         foreach (var c in context.clips)
39.         {
40.             c.blendInCurveMode = TimelineClip.BlendCurveMode.Manual;
41.             c.blendOutCurveMode = TimelineClip.BlendCurveMode.Manual;
42.             c.mixInCurve = AnimationCurve.Linear(1,1, 0,0);
43.             c.mixOutCurve = AnimationCurve.Linear(0, 1, 1, 0);
44.         }
45.  
46.         TimelineEditor.Refresh(RefreshReason.ContentsModified);
47.  
48.         return true;
49.     }
50.  
51.     [TimelineShortcut("BlendsToLinearAction", KeyCode.B)]
52.     static void KeyPress()
53.     {
54.         Invoker.InvokeWithSelected<BlendsToLinearAction>();
55.     }
56. }
57.