Open World Map

For open world maps, it's a bit different steps. Let's take Epic's Open World template for example. Because the landscape is built from multiple landscape proxies, you CAN'T use the set bounds and choose a single object reference to bound to.

Auto Setup - Landscape Proxies

From V1.2 Only.

If you do use landscape proxies, you can set the bounds automaticaly by just checking the Use Landscape Proxies checkbox and press the SetBounds.

This will set the MinimapCreator bounds to you open world landscape proxies for you.

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Manual Setup

The manual setup is true for any open world map, if you're using landscape proxies or not.

NavMesh

First we drop a NavMesh to the level and set his size to be large enough to cover the whole map in all axis.

Debug Nav Mesh

Just to be sure, press "P" on the keyboard so the navigation data can be visible and verify that you do have that green field.

Very large map so it would look very detailed

MinimapCreator

Now, drop a MinimapCreator actor to the level and set his location to 0,0,0 with a Bounds Size of 200048 so it will cover the whole level. Do not forget to set your render texture also.

Important! Make sure that the SceneCaptureComponent location is higher than the DynamicMeshComponent, otherwise the camera could not capture anything. For this example here's the location I have X, Y, Z : SceneCaptureComponent2D location: 0, 0, 0 DynamicMeshComponent location: 0, 0, -99

Build and Capture

Finally, press the Build Mesh button (it will take a while though the navigation data is very large). Once it is done, you can press the Capture Scene button.

Hover you mouse over the render texture in the MinimapCreator's settings and you should see a white circle if you followed the steps correctly.