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3D Mesh plot creates "Wall" at the end


We got a problem with all our 3D Mesh plots having a wrong connection at an end, connecting the last points on the side, creating an extra surface, looking like a “wall” which shouldn’t be there.

An example is here

Any ideas how to fix this?

@bgx A mesh3d trace is based on a triangulation. x, y, z stores the coordinates of the vertices, and i, j, k the indices of points defining the triangles. In your definition the keys i, j, k are missing.

See the mes3d attributes here:,

Thanks, I’ll have a look at that.