siftDetector calculates descriptors for only one orientation of keypoint？

[kakashidan]

thank you for sharing the code.

After reading the code , I doubt that there is something wrong with the line where angles always use idx 0 in the for loop.

I think i will be right instead of 0, right?

[kakashidan]

Addition, you'd better use j as for loop variable because i is used in the outer for loop :)