Looking for a photorealistic 3D house planner program

It is a misconception that you only need this professional software and it then guides you through the respective menus to produce ‘professional’ results. That is exactly what all these ‘hobby tools’ are for. You have to make compromises in the quality of the results, but thanks to their focus on amateurs, you can achieve partly decent results with just a few hours.

I see it the other way around: thanks to the focus on amateurs, the amateur tool is much more usable for the amateur than the professional tool, which, if you don’t take advantage of it, doesn’t even justify the learning curve, even if you got it for free and should thus actually be happy about the bargain.

??? I see exactly the same.

Regarding your photos,

That's what Photoshop does, not a home designer.
You are currently involved in product advertising

??? I completely agree.

Yes, that's how I interpreted it too – except for the conclusion

That's exactly what all these 'hobby tools' are for. You have to make compromises in the quality of the results,

where I would even say that the compromises are made rather with professional tools. Professional tools can do a lot, but they don't want to be geared toward the needs of amateurs; "can" is something that amateur tools can even do better. That's why I wouldn't call that compromises. You practically "miss out" only on what you don't need anyway and get gimmicks that professional tools are not focused on at all. From my point of view, professional tools are not just pareto-inefficient for amateurs here but downright less suitable.

Based on the Kampa picture, I would like to describe my wishes. On the front of the extension, some kind of cladding panels (made of ceramic?) are installed. But you can just as well work with horizontally running wooden panels, which gives the whole thing a completely different appearance. Or you take natural stone like gray slate ... Nowadays, so much is possible. But if the construction company doesn't point this out to me, I regret in the end not having known that such things exist. And even if... what does it look like in reality? That’s why I’m looking for THE program with which I can change everything as I like with a mouse click and also be inspired by various surfaces in the selection menus.

Sometimes the manufacturer offers application tools where you can try out different facades with a few clicks. Brillux has something like that for wall colors.

You are currently stuck in product advertising

please don't do nonsense, I didn't mean that!!!

Photoshop is also such a generic name for me. There is again a seemingly confusing number of products and modules, filters, etc... What would you need from it to create 3D images? First of all, a standard house design as a jpg image or an Acron file, meaning an acp format, to then virtualize it? How would that work, please describe a bit more precisely?
Surely my wish to have a virtual camera hovering around the house model under different lighting and weather conditions would not be possible with that—right?

I agree with you that professional tools belong in professional hands and vice versa.
However, I have a penchant for unusual extravagances. As far as I'm concerned, my beloved vacuum cleaner (no, I won't name the brand!) could also shave... even if I would only use that once or rarely. But I admit that's my personal quirk... I just have the function on board in case I might ever need it. Our washing machine, for example, has 1800 rpm and the missus was strictly against it. Well, I have used this speed several times and am glad to have it.

Back to the topic: I didn’t want to make suggestive statements here and had held back on my research. Now I would like to address concrete products.

Some time ago I researched in the direction of Vi2000 or Villa2000 (or also Vi Plan???) and thought that the chic renderings were rather created with such professional software. I always assumed that the house building companies worked with such software. The program is said to be incredibly powerful and, through different expansion levels, even enables virtual 3D images (with VR glasses) or even virtual sounds of the furnished house when using different building materials (wood, tiles, concrete ...) Apart from the surely ridiculously expensive price and perhaps cryptic usability... does anyone happen to be familiar with it?

Another very powerful program is apparently "3ds Max 2018," although the price of €2,000 per year (!) is extremely exclusive and thus does not fit into a budget.