The shading and blocking factor plays a significant role in the design of a heliostat field. It is the most computationally expensive task during the optimization process of a heliostat field. Over time, different methods have been developed to calculate the extent of the optical losses associated with shading and blocking. This paper focuses on the famous center point projection method and its implementation using Matlab. This work provides detailed procedures from the perspective of programming and simulation of central receiver systems. The underlying assumptions, the algorithm's strengths, and weaknesses are highlighted. The procedure and simulation parameters will help in developing optimization algorithms for designing high-efficiency heliostat fields. A dense radial staggered heliostat field is used for testing the performance of the algorithm. The field efficiency is calculated at different design points. The results show that the shading loss of the field changes with time, whereas there is negligible variation in the blocking loss. The instantaneous shading loss of a dense radial staggered field on December 21, noontime is 2.12%, whereas the blocking loss is 1.52%.

阴影和阻挡因子在定日镜场的设计中起着重要作用。这是定日镜场优化过程中计算量最大的任务。随着时间的推移，已经开发出不同的方法来计算与阴影和阻塞相关的光损失的程度。本文重点介绍著名的中心点投影方法及其使用Matlab的实现。这项工作从中央接收机系统的编程和仿真的角度提供了详细的程序。突出显示了基本假设、算法的优势和劣势。程序和模拟参数将有助于开发用于设计高效定日镜场的优化算法。密集的径向交错定日镜场用于测试算法的性能。在不同的设计点计算场效率。结果表明，场的阴影损失随时间变化，而阻塞损失的变化可以忽略不计。12 月 21 日中午一个密集的径向交错场的瞬时遮光损失为 2.12%，而阻塞损失为 1.52%。