* Returns the hash cell index of the given world position and camera position. Does not resolve collisions. * The hash key for resolving collision is

From https://en.wikipedia.org/wiki/M%C3%B6ller%E2%80%93Trumbore_intersection_algorithm

* Joins all the threads that have been started so far except the threads * launch with a key in the 'execeptions' vector passed as parameter */

General kernels.

Convolve in x direction (1st and 2nd derivative for filter in x direction, Gaussian in y direction). For details on the convolution, see separatedConv

Convolve in y direction (1st and 2nd derivative for filter in y direction, Gaussian in x direction), then compute difference. For details on the convo

Performs spatial filtering in the x direction on both the reference and test image at the same time (for better performance). Filtering has been chang

Performs spatial filtering in the y direction (and clamps the results) on both the reference and test image at the same time (for better performance).