There are two of the same meshes there, one of them has an animated material and their visibility is toggled by an overlap event. You can see it all in that asset’s blueprint’s component and graph sections.
I am looking for the same answer. Been looking at it and it is somehow related to Post Processing outline, but I don’t know how If you find the PostProcessing volume on the level and disable it, you will see no outline
I’m trying to do this with the new 4.15, and am also having trouble finding the options. It appears as though the misc > blendables section has been removed entirely from the post process volume options. Sad times
Anybody have an update on how this effect can be achieved?