WIP

Depends on bevy 0.13

bevy_mod_taa addresses a few issues related to smearing over disoccluded areas, and also favors sharper blending overall.

It also has a mode TAABundle::sample2() that somewhat resembles the TAA method used in Horizon Zero Dawn (P. 29) that only uses the previous frame to minimize ghosting/smearing artifacts.

Example screenshots under heavy motion:

bevy_mod_taa

bevy 0.12

bevy_mod_taa sample2