In this work we suggest a precise calculation method for GOSAT program devoid of shortcomings of existing methods.
The algorithm was tested on the plain unidirectional source which already has an exact solution to compare with. In that
way the radiuses of mesh cylinders were a much larger than their height. Then we tested an algorithm on finite cylinders
mesh and compared the results with Monte-Carlo simulation to be sure of its appropriateness.
As a results of our work we got a fast and precise method for the calculation angular radiance with consideration of