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Question by Dimitris · Nov 23, 2009 at 03:06 PM · shader

Flip normals of an object (or make material2-sided)

Very simple scenario: I want to map an image of my environment (sky etc) to a large sphere, inside which the camera will reside. However the material of the sphere only shows on the outside. How can I flip it so that it shows on the inside?

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Answer by robert · Nov 23, 2009 at 07:32 PM

Option 1: Edit the sphere mesh so that the normals point inwards. You can do that in your 3D application: if you're using Blender, go to edit mode, select all vertices and ctrl+f->flip normals. You can switch on drawing vertex normals in the mesh tools in Blender.

Option 2: Add/modify the Cull property of your material from Cull Back to either Cull Front or Cull Off.

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Answer by JoeStrout · Sep 08, 2014 at 07:22 PM

In case anybody finds this who uses Cheetah3d, the same operation there is done by selecting the faces (not edges or vertices) you want to invert, then using Tools -> Polygon -> Flip Normal.

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Answer by anileapen05 · Jun 26, 2019 at 07:17 PM

In 3dsmax u need to apply modifier Normals->Select Flip and export/save the model.

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