Is there any chance the 3D Viewer will get "Perspective View Mode" back?


Follow the below mentioned steps
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Step 1:
Go to camera tab, be make sure Orthographic mode is not cheked
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Step 2:
If so, Check on Perspective option
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Step 3:
Later adjust the perspective as per your requirement ...By sliding the perspective bar, as shown in the figure...
0 means full perspective........200 means orthographic
A value ranging between 30-40 on perspective slider bar will give best result.