Thank you! I used Twixtor which is an AfterEffects plugin that does use optical flow. I do it all in a pre-processing workflow which takes the 189 source panora

Thank you! I used Twixtor which is an AfterEffects plugin that does use optical flow. I do it all in a pre-processing workflow which takes the 189 source panoramic images and generates 756 interpolated images which are about 90gb in size. I then encode them into a WEBM video for distribution which brings the size down to 92mb (lores or 224mb hires). This video is extracted into memory at runtime and the images are then mapped to the background sphere based on where the player moves. Memory intensive but very fast.