BlzChangeMinimapTerrainTex issue

[HungryHusky]

I'm trying to use the function in the title in combination with setting the camera bounds. But when the new camera bounds are in different dimensions than the image, this happens:

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How can I change the image of the black box only in the minimap?

EDIT: Seven hells, I just forgot the in-game show terrain toggle. That's what happens when you forgot to think outside of the World Editor domain. Sorry for crap thread.