Summary
Morph targets fail to return to 0.0 in sequencer, skeletal mesh editor, and rendering. When in sequencer and rendering, this is very noticeable with eyes blinking. I set the first key frame to 0.0 (eyes open), next key frame is 1.0 (eyes closed), then the last key frame is back to 0.0. The character often shown about a 0.2 or 0.3 value even though the UI is set to 0.0. In the render, the first part looks normal.
After the eyes close, they won’t return to fully open. They look partially closed around a value of 0.2-0.3. In the skeletal mesh editor, I move the slider to 1, click the box to return it to 0, but the mesh retains the 1 value even though the value displays 0.0. This goes away when the slider is moved.
This was all normal for me in UE 5.6.
When in sequencer and rendering, this is very noticeable with eyes blinking.
I set the first key frame to 0.0 (eyes open), next key frame is 1.0 (eyes closed), then the last key frame is back to 0.0. The character often shown about a 0.2 or 0.3 value even though the UI is set to 0.0. In the render, the first part looks normal. After the eyes close, they won’t return to fully open. They look partially closed around a value of 0.2-0.3. In the skeletal mesh editor, I move the slider to 1, click the box to return it to 0, but the mesh retains the 1 value even though the value displays 0.0. This goes away when the slider is moved. This was all normal for me in UE 5.6.
Please select what you are reporting on:
Creative
What Type of Bug are you experiencing?
Character
Steps to Reproduce
-
Open a skeletal mesh with morph targets (example: eye blink) in UE 5.7 or 5.7.1.
-
In Sequencer, add a morph target track.
-
Set keyframes:
Frame 1: morph value = 0.0 (eyes open)
Frame 2: morph value = 1.0 (eyes closed)
Frame 3: morph value = 0.0 (eyes open)
-
Play the sequence in Sequencer.
-
Render the sequence.
-
Open the same skeletal mesh in the Skeletal Mesh Editor.
-
Move a morph slider to 1.0, then click the checkbox/reset to return it to 0.0.
Expected Result
Morph targets should fully return to 0.0 when keyed or reset.
Eyes should return to fully open after blinking.
Skeletal mesh appearance should match the displayed morph value.
Behavior should match UE 5.6, where morph targets reliably clear back to zero.
Observed Result
Morph targets often do not visually return to 0.0 even though the UI shows 0.0.
In Sequencer and renders, eyes remain partially closed, approximately 0.2–0.3.
In renders, the first blink looks correct, but after closing once, the eyes do not fully reopen.
In the Skeletal Mesh Editor, resetting a morph from 1.0 back to 0.0 leaves the mesh visually deformed until the slider is moved again.
This behavior does not occur in UE 5.6 using the same assets.
Platform(s)
Windows 11, UE 5.7.1
Video
