Partial rendering of an actors at multiple locations (for a portal system)

[e4c23ef5]

Thank you all for those initial answers!

@Kris

Two different actors.

When you begin touching the first portal, duplicate the actor at the second portal on the opposite side, offset as if to appear that it is just exiting.

In both cases, you will need to use materials to hide what ever parts are on the wrong side of the portal.
I am not great with materials, so while I know its possible, I can’t tell you how

I see what you mean.
However, I was hoping to avoid duplicating the actor: As a UE4 beginner, I find this solution particularly tricky to manage and rather error-prone, especially if the actor has some kind of dependency to or is somehow referenced by other actors.

@smelnick97

Based on a video I’ve seen for a similar project in Unity (https://www.youtube.com/watch?v=cWpFZbjtSQg) it seems like one way to cut off part of the mesh would be to adjust the clipping plane so that it is aligned with the door when you render. However… I’m not really sure how to do so in Unreal, and I can’t find much on the topic.

Another approach would be to add a custom clipping plane via the material shader. Basically, you would need to enable Opacity Mask on the material (https://docs.unrealengine.com/en-US/…1_8/index.html) and pass in white or black as the opacity depending on which side of the clipping plane the point lies on.

Here’s an older video showing a similar effect, albeit with a sphere: https://www.youtube.com/watch?v=CkEueafOvF.

After a bit of research, I found this tutorial https://www.youtube.com/watch?v=GO5zQ5tUUbM which shows how to do that.
While certainly useful, I think that this technique solves only half the problem – i.e. it allows partially masking the actor at the source portal and/or partially showing “another actor” at the target portal, but it doesn’t partially hide the actor at the source portal while simultaneously partially showing “the same actor” at the target portal.