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Spline mesh disappears when aligned on z axis

Using 4.18.1 I have found a very specific case where spline meshes appear to be failing when it has two points aligned on the z axis. First, let me detail what I was trying to achieve:

  • Create a new blueprint blank project with starter content

  • New default level

  • Create a new Actor blueprint

  • Add a scene to replace default root

  • Add a spline component

In the construction script (this also applies to the normal event graph as well), create the graph as shown in the following image: alt text

In the Add Spline Mesh Component, select the mesh SM_PillarFrame, and the forward axis as Z, then compile. In the viewport, you should see the mesh aligned along the x-axis as expected. Now translate key 1 of the spline to position [0, 0, 100] and the mesh will become hidden.

Product Version: UE 4.18
blueprint.jpg (129.7 kB)
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asked Nov 30 '17 at 04:33 PM in Bug Reports

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Dr. Widgit
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avatar image Dr. Widgit Nov 30 '17 at 04:34 PM


If you translate x or y even fractionally away from [0,0] (say, [0,0.00001] then the mesh will reappear.

Now more fundamentally, the issue appears to be just the spline mesh and there is no relation to the spline itself. The construction diagram can be reduced to just the Add Spline Mesh Component, and Set Start and End. Set the Start Pos at [0,0,0], Start Tangent [0,0,0], End Pos [0,0,100], and End Tangent [0,0,0]. Again the mesh will disappear. For more reasonable tangents, you can use [0,0,10], and [0,0,10], but again no change. If one of the tangents is set to a non-aligned axis, say [0,1,10], then again the mesh will appear.

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Hi Dr. Widget,

I was able to reproduce this behavior so I've created JIRA UE-52947. Our developers will be investigating further. Follow that link to monitor the status of the issue on our Public Tracker.

In the meantime, the workaround would be to use the offset that is like you described above (0.00001).

Thanks, -TJ

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answered Dec 01 '17 at 07:49 PM

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