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This is caused by the model. If you can find out which model it is, delete it and replace it with a sofa or other object with a large number of facets.
Usually it's good to find and change.
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Try to optimize the face of the model. Most of the problems are with your furniture model. You can optimize the number of faces in the model. Or adjust the material value of the model.
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If you have too many faces in your model and the calculated values are too large, you can delete the invisible faces, minimize the faces, and then install a vray renderer to look at them.
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Save a single model, then merge the two to open it, and render it directly, OK.
If you want to use VR, you have to adjust it slowly. Replicate to the instance for scaling.
Either the direction of the surface is wrong.
Then there is no indirect lighting. >>>More
One is the lighting problem.
The second is the normal problem. >>>More
It should be that the renderer is not set, in.
Rendering - Render settings. >>>More
According to the above meaning, you have this ray-traced material in your material, vray does not support this material, it is estimated that you rendered the problem, and the sentences in the middle are estimated to be some problems with the parameter settings in your rendering settings.