DirectX is a beginner. I don't quite understand how to write the code here.

When reading some tutorials, you will often encounter the Rotation Angle problem, which is generally like this:

Float Theta = (2 * d3dx_pi * I)/(50-1 );

Float Theta = (I-1) * 12 * d3dx_pi/180;

.... This is similar to how the angle is calculated. The circumference is 2 * d3dx_pi. to divide a circumference n to an equal point, the angle is 2 * d3dx_pi/n, (2 * d3dx_pi * I)/(50-1) It is not hard to understand. It is gradually increased from the perspective of division. And (I-1) * 12 * d3dx_pi/180, not like, can be the denominator of the molecular divide by 6, then (I-1) * 2 * d3dx_pi/30, is not the same.