3D image of landmark

His guy’s, I’m new to this so hope you can help. I have been trying to get a 3D image of a local landmark but every time it gets processed it comes out either black or bury like wet paint.
Can someone shed some light on this please.

Are you using nadir (vertical) and/or oblique images?
It takes the proper application of the techniques to optimize the results. Some of that comes with experience.
This may be helpful.