计算公式在帮助里有。
对于2D网格
normalized:
AR = (4 * SQRT (3) * Area of triangle) / sum of squares of edge lengths
Range: 0.0 (straight line) to 1.0 (equilateral triangle)
Standard:
AR = longest side squared / (2 * triangle area)
Range: 1.16 (equilateral triangle) to infinity (straight line)