Custom vertex shader with lambert lights - Questions - three.js forum

I’m trying to reuse the fragment of MeshLambertMaterial in my custom vertex shader. Basically my shader is drawing a cylinder between 2 boxes. As you can see from the jsfiddle, the light is not updated correctly, the directional light follows the camera, and if you look from the side you can see the boxes are properly illuminated but the cylinder is not, it is only illuminated from the top. Do I somehow need to recalculate the normals in my vertex shader? How can i do that? https://jsfiddl

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