BISTRA upgrade info

Version 2.0w

• Solar processor based on direct and diffuse solar radiation climate files.
  Solar irradiation on (slanted) edges of triangulated object geometry.
  Solar reflection factor based on angle of incidence.
  Solar transmission factor after subtraction of reflection.
• Definition of north orientation based on 3 rotation angles around 3D rotation axes.
• Sun obstacles as spherical rectangles on the sky hemiphere (defined by azimuth and altitude coordinates).
• Sun path visualisation (in animation video).
• Diffuse solar radiation redistributed using radiosity method.
• Output of absorbed solar fluxes.