I am trying out some of the basic level edit features and I imported some assets.
When I place them in a simple empty level, they look like in the photo, any clue of what is happening and how to prevent it?
Hard to tell from just the photo but this could just be a problem due to lighting. One way you can check this is by changing to unlit and seeing if the black spots still appear.
You can click this button in the top left corner of the viewport or press f2 while playing.
If the spots go away, then this means its a lighting problem, so try changing the lights in your scene or changing some of their parameters.
Also it could be the normals map on your floor mesh, so maybe try disabling it in the material.
As I said, It could be something related with the dynamic lighting.
I’ll just learn to prototype, and then I’ll get deeper in the visual features and else.