This study proposes a method of object shading and display of the object’s visible parts based on OpenGL, which is used to solve the problems of large calculation amount and low accuracy when the blanking process of a complex structure object is realized by a numerical method. By enabling depth buffers and depth testing, the computer graphics acceleration card is used in a hardware level to quickly achieve the goal of hidden and surface element distance information. The calculation efficiency and accuracy are improved. Moreover, the cosine of the angle between the target element and the detection line of sight is obtained by a single illumination. Subsequently, the target reflectivity distribution is obtained by a simulation considering the temporal and spatial distribution characteristics of the laser pulse. The convolution model is then used to calculate the laser echo waveform of the target. The effects of the laser pulse width and the target surface material on the quality of laser reflection tomography are analyzed using the presented method.