What is important is the mesh, depending on it the dual mesh gives the size of the crystal.
So you need to remesh with triangles your surface.
Your mesh
The dual mesh it gives
Dual mesh of the surface remeshed (unsing remesher from Ngon plugin)
“Topology matters”
20201019_crystal growth on surface.gh (377.1 KB)
20201019_crystal growth perfect crystal.gh (382.1 KB)
Fast render
