Float UMaterial Parameter throws error in matinee when Exporting Movie

Development Cinematics & Media
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1

I’m using some float material Parameter tracks in matinee to control some materials. When Trying to render the clip out through clicking ‘Movie’ I get the following error:

Can't save /../ Nebula__sovereign_fires_back.umap: Graph is linked to private object(s) in an external package.
External Object(s):
InterpTrackFloatMaterialParam_1
InterpGroup_5
InterpTrackFloatMaterialParam_3
InterpGroup_7

Deleting the tracks (I have two in the project) with the float U material Parameters will allow the render to continue.

TO REPRODUCE:

-Create a material with a scalar paramater.

-In Matinee: New group (I’ve got the Decal actor selected when creating a new group) > Add Float Material Parameter Track.

-Try and Export a movie.

Thanks in advance for any suggestions. Please let me know if you need any more information.

2

Hi -

Following your reproduction steps I am not getting any error messages. I have attached my Test Project below, can you have a look and make adjustments to make it closer to your project?

Thank You -

Eric Ketchum

Test_Project_4.8.3

3

Hi Eric, Unfortunately (or fortunately) I cannot reproduce the error also.

In the project I initially created the Matinees by right clicking in the content browser and creating a matinee sequence there, before dragging it into my level and animating. I could not export the result. Deleting the Umaterial Paramater tracks allowed me to export.

In the same project I went ahed and created a matinee (By using the top toolbar, not the content browser) and everything worked fine. (I copied the animation data to the new matinee, Material Paramaters and all)

I’ve tried a couple things now and cannot bring up the error in any other project. The error is still showing in the original level however.

I’ve migrated a version of the scene and attached it. If there’s anything else I can help with please let me know.

4

Hi Lukewade2 -

Thank you for your test project that helped me narrow down the issue. I was able to reproduce it now and have entered a bug report as UE-20123. I will keep you informed here as we investigate a solution to this issue, though it might come back as designed. In the meantime, I would recommend keeping the created InterpData File that gets created when you add a Matinee Actor from the Viewport Matinee dropdown.

Thank You Again for your help -

Eric Ketchum