GeometryModel3D model =
.;
string imgFile = @"C:\a.jpg";
Uri imgUri = new Uri( imgFile, UriKind.RelativeOrAbsolute );
ImageSource imgSrc = new BitmapImage( imgUri ); //load image
DiffuseMaterial mtr = new DiffuseMaterial();
mtr.Brush = new ImageBrush( imgSrc );
model.Material = mtr;
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