# Sidewall Angles¶

Learning targets

• Define 3D objects with non-rectangular sidewalls in z-direction

In the previous section we were only able to produce geometries with straight sidewalls in the vertical direction. This example shows how to define non-rectangular sidewalls for the cylinder geometry of the previous section:

As a simple concept we redefine the geometry parameters of the cross-section layout at an interface of two layers. This is done by adding a `LayerInterface` section between two layers containing a dictionary called `GeometryValues`:

```LayerInterface {
GeometryValues = [
`.jcm` Input File
 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62``` ```Layout3D { Name = "TutorialExample3D" UnitOfLength = 1e-06 MeshOptions { MaximumSideLength = 1.3 } BoundaryConditions { Boundary { Direction = Vertical Class = Transparent } Boundary { Direction = Horizontal Class = Periodic } } Extrusion { Objects { Polygon { Name = "ComputationalDomain/Background" DomainId = 1 Priority = -1 Points = [-2 -2, 2 -2, 2 2, -2 2] } Circle { Name = "Circle" DomainId = 2 Radius = 1 RefineAll = 2 } } MultiLayer { Layer { Thickness = 1.0 DomainId = 1 } Layer { Thickness = 0.1 DomainId = 2 } LayerInterface { GlobalZ = 0.0 } Layer { Thickness = 1.5 DomainIdMapping = [1 2 2 3] } LayerInterface { GeometryValues = [ Circle/Radius = 0.8 ] } Layer { Thickness = 2.0 DomainIdMapping = [1 3] } } } } ```