PrismGenerator.cs

using System.Linq;
using UnityEngine;

public class PrismGenerator : PlaneGenerator
{
    #region InspectorVariables
    [Header("Plane values")]
    [SerializeField]
    private Vector3 _offset;
    public Vector3 Offset
    {
        get => _offset;
        set
        {
            _offset = value;
            GenerateShapeForAll();
        }
    }
    #endregion InspectorVariables

    #region Implementation
    protected override (Vector3[] vertices, int[] triangles) GenerateTopology()
    {
        (Vector3[] vertices, int[] triangles) plane = CreatePlane(_vertices);
        Vector3 center = CreateMesh(plane).bounds.center;

        return CreatePrism(
                (plane.vertices.Select(v => v + _offset).ToArray()
                    , plane.triangles),
                (plane.vertices.Select(v => v).ToArray()
                    , plane.triangles.Reverse().ToArray()),
                null, null
            );
    }
    #endregion Implementation
}