(1) Begin
(2) Create a transparent border of virtual campus;
(3) Render a yellow ground;
(4) Render the buildings in the virtual campus;
(5) Set the attributes of dust particles, including their size, color and shape;
(6) Read the coordinates of dust particles from file Output, calculate NParts;
(7) If the particles are in the area of sampling points ,
calculate the accumulation amount of dust particles ;
(8) Render the particles according to the value of NParts;
(9) Output the accumulation amount of dust particles in five sampling points;
(10) End
Algorithm 5: The visualization algorithm of dust particles’ KMC evolution.