中文说明：模型顶点在irradiance_result中的像素坐标的计算，顶点间的欧式距离计算，并选取每个顶点附近12个点与该点的欧式距离。以及纹理图中像素点的颜色值的获取。
English Description：
The vertex of the model is in the infrared_ The calculation of pixel coordinates and Euclidean distance between vertices in result, and the Euclidean distance between 12 points near each vertex and the point. And the color value of the pixel in the texture image is obtained.