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Votes
0
Found in
5.5.1f1
Issue ID
910419
Regression
No
Flat animation curves with value of 0 do not update every frame
Steps to reproduce:
1. Open attached project
2. Open "scene" scene
3. Select "GameObject" in the Hierarchy
"GameObject/Cube" has a flat animation curve setting its local position to Vector3.zero
4. Select "FlatAt1" in the Hierarchy
"FlatAt1/Cube" has a flat animation curve setting its local position to Vector3.one
Both cubes local positions are altered in the LateUpdate in CubeMove.cs
5. Enter play mode
Expected result: both cubes stay at the local position set by their animations even though their position is altered in the LateUpdate
Actual result: cube with a flat curve setting its local position to Vector3.zero doesn't update everyframe, therefore it keeps moving when altered by the script
Cube animation behaves as expected if local position value is very close to zero, but not zero
Reproducible with: 5.5.3p3, 5.6.1f1, 2017.1.0b5
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Resolution Note (2017.1.0f3):
The animation system only evaluates constant curves once and then gameplay can modify the value afterwards. Thus, you'll get a change in behaviour depending on what curve (constant or non-constant) is used to animate a parameter. Constant curves that have the same values as the default scene values will not write to the scene every frame. This is been done to save the cost of writing to transforms.