Purpose: I want to produce a visualization of the Australian seafloor but I'm not having any luck converting the shapefile contours to a DEM.

I can convert landmass DEM into a Blender viz and the next stage is to get the seafloor into the viz.

enter image description here

I've tried followed the instructions from here and here but QGIS Processing's IDW and TIN tools either time out (15+ mins) or produce empty TIF files.

How should I proceed?

Here is the Australian coastline shapefile

Here are my TIN settings

enter image description here

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