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Can't change spline curve in real-time

Hi, I'm trying to modify a spline component in real-time within its actor's blueprint during its tick function. I can change the position of the spline points, but not those points' tangents or up vectors. The calls to "Set Tangent at Spline Point" and "Set Up Vector at Spline Point" seem to do nothing to change the shape of the spline curve. The spline curve stays as a straight line regardless of what its point tangents are. Here is my blueprint logic: alt text

Proximal End and Distal End are two static meshes that I'm repositioning and spinning randomly. I'm trying to draw my spline between the two meshes and using the meshes' rotations to update the spline points' rotations. My spline has only two points.

Here's a video of the behavior: https://www.youtube.com/watch?v=IJULN-uK438 The cone along the spline is being driven based on the location, up vector, and tangent at 60% of the length along the spline.

How can I get the spline curve shape to update in real-time?

Product Version: UE 4.12
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asked Nov 18 '16 at 07:47 PM in Using UE4

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