[Blender] The surface of the object has become transparent. How to fix when the mesh is transparent

Problem

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.

1. Check the orientation of the mesh.
   [Object mode] or [Edit mode]
   [Viewport Overlay] → [Geometry] → [Face Orientation] Off → On.

Surface orientation OFF	Surface orientation ON

2. Blue indicates that the mesh faces are facing outward, and red indicates that the mesh faces are facing inward.
3. 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

1. [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