multithread add operation in kernel 'renderCUDA_count'

[humphryey131]

Hi guys, I am wondering if the following accumulation in renderCUDA_count kernel shall use atomic operation :

As far as I know, the collected_id[j] in different parallel threads may run into idential value. Thanks.

[linwk20]

I also found this problem, did you try atomicAdd(&gaussian_count[collected_id[j]], 1);?
Will it be very slow?