Problem
The surface of the object is now transparent.
The mesh is transparent.
Cause
・The normal direction of the mesh is reversed (flipped)
・[3Dビューのシューティング] [Hide back side] is turned on
This time, I will introduce how to fix when the object surface becomes transparent in Blender and the mesh is transparent.
Problem: The surface of the object becomes transparent, the mesh is transparent.
Blender 2.83, 2.90
 |
 |
|---|---|
| Normal | Problem |
The surface of the object becomes transparent.The mesh is transparent.
Some surfaces of the object are now transparent, as shown in the image.
Solution 1: Turn the mesh surface outward
If the orientation of the mesh is reversed, the surface will appear transparent.
- Check the orientation of the mesh.
[Object mode] or [Edit mode]
[Viewport Overlay] → [Geometry] → [Face Orientation] Off → On.
 |
 |
|---|---|
| Surface orientation OFF | Surface orientation ON |
- Blue indicates that the mesh faces are facing outward, and red indicates that the mesh faces are facing inward.
- Turn the red side outward.
[Edit mode], [Select surface] Select the red surface.
[Edit mode], [Mesh] → [Normal] → [Align faces outward] or [Flip]
 |
 |
|---|---|
| Surface direction: inside | Surface direction: outside |
This is OK.
Once you’re satisfied, turn Viewport Overlay → Geometry → Face Orientation back off.
Solution 2: Turn off Hide Back
- [Object mode] or [Edit mode], [3Dビューのシューティング] Turn [Hide back side] on → off.
 |
 |
|---|---|
| Hide back side ON | Hide back side OFF |
It is OK if the surface is not transparent.
Reference
Correcting the front and back sides of surfaces with Blender 2.8 – MR is fun
Operating Environment
- Windows 10 Pro 1909
- Blender 2.83 Maya Config Addon For Blender 2.8
- Blender 2.90