Thanks Keet! So far, I have found one face of the pyramid on which the texture fits correctly. I made the other faces invisible and combined them into a group. To get the long side of the roof, I applied several edges with a slight offset. And most importantly, for the texture, I used a PNG texture of a tiled roof, from which I cut out the upper part. I did this in Photoshop. Therefore, the result is not a pyramid with a vertex, but a cut-off vertex. It's on the roof of our esteemed Indigo Solo.
There's a hole on top, of course, if you take a picture from above, you need to insert the lid from the box.
