(Anti-aliasing is A4 extra feature)
A close ended cone and a double ended cylinder are created as extra primitives.   
Reflection is done by tracing a new reflected ray when primary ray hits an reflected surface. 
Refraction is done by tracing a new refracted ray when primary ray pass through a glass. 
Path tracing follows fresnel equation to properly select percentage of reflection and refraction. A little reflection of side walls (red and blue) can be seen in the glass sphere. 
Soft shadow is implemented throught distributed ray tracing. A spherical area light is implemented. 
Glossy reflection can be identified on the top left glass sphere. 
Glossy refraction is shown on the spherical glass. 
Perlin Noise is used to generate a marble like texture. Perlin noise is divided into octave. Octave with higher frequence has its magnitude decreased. 4 Octaves are summed up, then used as a phase shift to a sine function. 
  
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Texture Mapping & Transparent Cone 
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Multiprocessing is enabled to help with the speed of processing.