Sounds like either a black material or black texture on your object. But hard to say without the original files. You can share them confidentially using firstname.lastname@example.org so I can have a look
I sent the file of Rhino. Please tell me the cause.
I think this is because the obj mesh has imported with the material set to ‘use object parent’.
Click properties/material/ and apply a new material this way.
It looks like you sent the JPG, not the 3dm file. Please send the complete 3dm file with the imported OBJ mesh already inside it…so that we can repeat your problem by opening the 3dm file and pressing Render.