Determining projects to restore...
  Restored C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch.csproj (in 1.45 sec).
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Commands\RelayCommand.cs(17,21): warning CS8767: Nullability of reference types in type of parameter 'parameter' of 'bool RelayCommand.CanExecute(object parameter)' doesn't match implicitly implemented member 'bool ICommand.CanExecute(object? parameter)' (possibly because of nullability attributes). [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Commands\RelayCommand.cs(22,21): warning CS8767: Nullability of reference types in type of parameter 'parameter' of 'void RelayCommand.Execute(object parameter)' doesn't match implicitly implemented member 'void ICommand.Execute(object? parameter)' (possibly because of nullability attributes). [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Commands\RelayCommand.cs(27,35): warning CS8612: Nullability of reference types in type of 'event EventHandler RelayCommand.CanExecuteChanged' doesn't match implicitly implemented member 'event EventHandler? ICommand.CanExecuteChanged'. [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\ViewModels\ViewModelBase.cs(8,50): warning CS8612: Nullability of reference types in type of 'event PropertyChangedEventHandler ViewModelBase.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'. [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Rendering\SceneBinder.cs(334,32): error CS8121: An expression of type 'ModelVisual3D' cannot be handled by a pattern of type 'GeometryModel3D'. [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]

Build FAILED.

C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Commands\RelayCommand.cs(17,21): warning CS8767: Nullability of reference types in type of parameter 'parameter' of 'bool RelayCommand.CanExecute(object parameter)' doesn't match implicitly implemented member 'bool ICommand.CanExecute(object? parameter)' (possibly because of nullability attributes). [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Commands\RelayCommand.cs(22,21): warning CS8767: Nullability of reference types in type of parameter 'parameter' of 'void RelayCommand.Execute(object parameter)' doesn't match implicitly implemented member 'void ICommand.Execute(object? parameter)' (possibly because of nullability attributes). [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Commands\RelayCommand.cs(27,35): warning CS8612: Nullability of reference types in type of 'event EventHandler RelayCommand.CanExecuteChanged' doesn't match implicitly implemented member 'event EventHandler? ICommand.CanExecuteChanged'. [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\ViewModels\ViewModelBase.cs(8,50): warning CS8612: Nullability of reference types in type of 'event PropertyChangedEventHandler ViewModelBase.PropertyChanged' doesn't match implicitly implemented member 'event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged'. [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\Rendering\SceneBinder.cs(334,32): error CS8121: An expression of type 'ModelVisual3D' cannot be handled by a pattern of type 'GeometryModel3D'. [C:\Users\alask\.gemini\antigravity\scratch\hansen-sketch\WpfEngineeringSketch\WpfEngineeringSketch_4xxrlqqb_wpftmp.csproj]
    4 Warning(s)
    1 Error(s)

Time Elapsed 00:00:02.44