What version do you use ?

20260321-0707-37.6220604.mp4   it show of rotate view but can't rotate it something appear gizmo  

You can yes, but what exactly do you need to achieve ?

after use uv room -> export obj ? 

Yes, you can create seams manually or to use autoseams > unwrap or do it automatically using automap     This video series created by AlienMinefield is a good documentation to watch the whole process of UV creation on 3DC   Hope this help

here my language

Go to the Retopo Room create optimized mesh, use UV tools in retopo room to rough in UVs, apply UV set and bake for use in Paint Room. how to use auto map in retopo room ? i saw uv map can use auto map without click seam ? so uv tool - export item into retopo room ? am i correct ?

can uv mapping connect into retopo toom ? no, UV Room is specialized for advanced UV editing, packing, and managing UVs off any object located on Paint room, nothing more. Models created in the retopo room do not have any UVs applied initially it is raw geometry which is why it wont show up if you switch to the retopo room. The same applies to the sculpt room it is dense geometry with no UV's "general workflow in 3DCoat: Create a sculpt in the Sculpt room. Go to the Retopo Room create optimized mesh, use UV tools in retopo room to rough in UVs, apply UV set and bake for use in Paint Room. From Paint Roomg o to UV Room to adjust UVs as necessary. If you want to go directly to UV room from Retopo without applying UV's export your retopo mesh then switch to the UV room and import the mesh, select autotopo in the import setting to give you an initial UV Layout."   how to fix it retopo room's uv mapping ? retopo room have all the tools required to create/repair any UVmap    

i mean in maya easyly fix meanwhile i'm use 3d coat kinda difficult because many different system. can uv mapping connect into retopo toom ? how to fix it retopo room's uv mapping ?

Retopo room focuses on creating or editing low-poly geometry, with basic UV tools for immediate unwrapping.   The UV Room is specialized for advanced UV editing, packing, and managing UVs on existing "Paint Objects"   To see the retopo mesh on UV room you need to bake to Paint room first

i was confused uv room and retopo room have different uv mapping , how to fix retopo room ? 

this bug was solved on latest version

To change the Windows language,  go to Settings > Time & language > Language & region. Click "Add a language," select your preferred language, install it, and select it under the "Windows display language" menu. You must sign out and back in to apply changes

i use rectangle lasso and click alt + lmb , it show just make long height but not rotation 

i saw video 3dcoat 2024 it can show off rotation so it's strange  how to change English as default language

If the system is using English as default language and you had selected the rectangle lasso as stroke for Voxhide Press alt then drag * i am testing it on 3DC 2026.1

can u explain with picture or somethin gif ? i tried ctrl + alt it didn't rotation 

ctrl + alt to rotate the rectangle stroke at fixed amount of angle, release ctrl+alt and then release lmb to hide