This could be quite complicated so I will try to explain as simply as possible. We have an object using a follow path constraint and key frames to speed up and slow down in certain places. The animation runs perfectly smooth in blender but once imported in to unreal it seems to jump up and down in places. Also the animation file is causing a lot of stability problems in Unreal for example when trying to export a matinee video the engine force closes. Additionally when the project is saved and then reopened the engine force closes, always with the following error:
[2016.02.25-15.36.41:460][467]MapCheck: Info Map check complete: 0 Error(s), 0 Warning(s), took 50.128ms to complete.
[2016.02.25-15.36.41:461][467]LogFileHelpers: Loading map ‘Tracktest’ took 0.112
[2016.02.25-15.36.41:475][468]Cmd: UpdateLandscapeEditorData -warnings
[2016.02.25-15.36.41:476][468]Cmd: UpdateLandscapeEditorData
[2016.02.25-15.36.43:719][673]LogPackageName:Error: DoesPackageExist: DoesPackageExist FAILED: ‘/Game/anim/Air_anim_air Object_Skeleton’ is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:
[2016.02.25-15.36.43:719][673]LogLinker:Warning: Can’t find file ‘/Game/anim/Air_anim_air Object_Skeleton’
[2016.02.25-15.36.43:719][673]LogPackageName:Error: DoesPackageExist: DoesPackageExist FAILED: ‘/Game/anim/Air_anim_air Object_Skeleton’ is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:
[2016.02.25-15.36.43:719][673]LogLinker:Warning: Can’t find file for asset ‘/Game/anim/Air_anim_air Object_Skeleton’ while loading C:/Users/djd711/Documents/Unreal Projects/tracktest/Content/anim/Air_anim.uasset.
[2016.02.25-15.36.43:719][673]LoadErrors:Error: Error /Game/anim/Air_anim : Can’t find file for asset. /Game/anim/Air_anim_air Object_Skeleton
[2016.02.25-15.36.43:719][673]LogPackageName:Error: DoesPackageExist: DoesPackageExist FAILED: ‘/Game/anim/Air_anim_air Object_Skeleton’ is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:
[2016.02.25-15.36.43:719][673]LogLinker:Warning: Can’t find file ‘/Game/anim/Air_anim_air Object_Skeleton’
[2016.02.25-15.36.43:719][673]LogPackageName:Error: DoesPackageExist: DoesPackageExist FAILED: ‘/Game/anim/Air_anim_air Object_Skeleton’ is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:
[2016.02.25-15.36.43:719][673]LogLinker:Warning: Can’t find file for asset ‘/Game/anim/Air_anim_air Object_Skeleton’ while loading C:/Users/djd711/Documents/Unreal Projects/tracktest/Content/anim/Air_anim.uasset.
[2016.02.25-15.36.43:826][673]LogPackageName:Error: DoesPackageExist: DoesPackageExist FAILED: ‘/Game/anim/Air_anim_air Object_Skeleton’ is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:
[2016.02.25-15.36.43:826][673]LogLinker:Warning: Can’t find file ‘/Game/anim/Air_anim_air Object_Skeleton’
[2016.02.25-15.36.43:826][673]LoadErrors: Info Failed to load /Game/anim/Air_anim_air Object_Skeleton.Air_anim_air Object_Skeleton Referenced by Air_anim_air Object
[2016.02.25-15.36.43:826][673]LogPackageName:Error: DoesPackageExist: DoesPackageExist FAILED: ‘/Game/anim/Air_anim_air Object_Skeleton’ is not a standard unreal filename or a long path name. Reason: Name may not contain the following characters:
[2016.02.25-15.36.43:826][673]LogLinker:Warning: Can’t find file for asset ‘/Game/anim/Air_anim_air Object_Skeleton’ while loading NULL.
[2016.02.25-15.36.43:826][673]LogWindows:Error: Windows GetLastError: The operation completed successfully. (0)
The only way I can get the level to load again is if I go in to the content folder and remove the animation files. This just makes no sense as the files are obviously there.
So just to recap, two major issues:
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Strange anomalies in the animation despite smooth results in blender
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When loading level back up the animation files cause the engine to force close. Trying to export matinee video also causes force close with the same error message.
Here is a video showing the animation problems: