I am now using shaders in Godot to model the early version sails in Square Rigger. I noticed that when rendering the main scene, the mesh disappears when viewed from behind.

According to https://godotengine.org/qa/18211/blender-created-meshes-appear-transparent-when-viewed-inside this is because back facing polygons are culled.

Add the following to your Godot shader script.

shader_type spatial;
render_mode cull_disabled;

Solved. The mesh is now visible from all angles.

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