All exmple images in the book were rendered using Angel except those noted here. These were rendered using PRMan.
Angels support for Opacity is poor. This is a fundamental limitation of its Z-buffer architecture. If you wish to render this image with Angel, then increasing PixelSamples improves the resulting image slightly. However there is no support for colored opacity.
Angel does not support varying parameters to surfaces, and hence the modified surface normals have no effect.
Angel supports simple transformation motion blur, but does not support motion paths or deformation blur. When rendering simple motion blur in Angel, the results can be improved by increasing the Y parameter of PixelSamples.
Angel does not support varying parameters.
Angel does not support light shaders.