Using OS Terrain50 with VectorMap District's water and woodland polygons I used Safe's FME Desktop to generate a landscape inspired by Owen Powell's work.
TIN Mesh
FME lets you export the triangular faces of the TIN as polygons.
View up Glen Clova
Using the FME Data Inspector to view the surface in 3D.
View over Cairngorms
Rendered in QthreeJS in QGIS - the Angus Glens
Using QThreeJS in QGIS
The Spittal of Glenshee - QthreeJS
Spittal of Glenshee
The rather untidy workbench processing the data.
The Workbench