ENH: add a vtk.js backend for MNE's 3D renderer (JupyterLite split 3/5) - #14144
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ENH: add a vtk.js backend for MNE's 3D renderer (JupyterLite split 3/5)#14144natinew77-creator wants to merge 1 commit into
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VTK cannot load in WebAssembly, so the JupyterLite notebooks need a renderer that draws with vtk.js. MNE does its geometry in numpy and only hands the result to a renderer, so replacing that last step leaves the transform maths to MNE.
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Part 3 of the split of #13925. Parts 1 and 2 are #14128 and #14135.
Adds a drawing backend for MNE's 3D renderer that uses vtk.js, since VTK itself cannot load in WebAssembly. MNE's 3D functions do their geometry and coordinate-frame work in numpy and only hand the result to a renderer, so replacing that last step leaves the transform maths with MNE. That matters here, because a subtly wrong head or device transform still produces a plausible-looking picture.
Supported: meshes, surfaces, spheres, tubes and glyphs, which covers the static figures the docs render. Not supported: the interactive
Braintime viewer, which needs dock widgets, and scalar colormaps, which pyvista-js 0.15 does not have.It is a plain string constant, so nothing in the build touches it yet. The setup cell that appends it is #14150.