image load in WPF with 3d models

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C#

WPF

Image i = new Image();
BitmapImage src = new BitmapImage();
src.BeginInit();
src.UriSource = new Uri("Truck.jpg", UriKind.Relative);
src.EndInit();
i.Source = src;
i.Stretch = Stretch.Uniform;
int q = src.PixelHeight; // Image loads here
stackPanel1.Children.Add(i);

above is the code i am trying to load in My WPF panel

my main window consist of som 3d model but i am unabel to do this please help me out..