Problem solved. I have returned my laptop to factory settings and updated to Windows 11.
Thanks

The problem is not in your program. Sh3D works perfectly. The problem is my laptop. Sh3D generates OPENGL code correctly but wrong transparency code arrives on the graphics card.
It is normal in windows, problem, problem, problem.

Not work. I have downloaded Sh3D source code to gradually discover what happens. Software is not my specialty because I design hardware (processors for communications). I will remember old times. I will notify you of the results.
Thanks

Unfortunately it hasn't worked. I use 64-bit version, but OPENGL Iris Xe graphics driver does not support 32-bit version of SweetHome3D.
Thanks for your try.

Thanks for your time. Very kind.

No. In this link is the original design. Yesterday the program worked OK. When opening it today it doesn't work well. Curious. It also works badly if I start a new design with only 4 walls.

https://drive.google.com/file/d/1CnykAe ... p=drivesdk

I have worked with SweetHome3d for several days without problems. Today I have opened the program and the 3D vision is semi-transparent in 70% of the design and out of orders. The "3D view", "Modify 3D view" "transparency" tab is opaque.
Attached link to see image of the 3D vision.
Could someone ...