thanks all.

I was simply surprised that it does not work as I expected, I just guessed some tricks are missing from the depth view...

and what do you think, would the same happen with a billboard model with an animated (shifted) skin?

I think I start with the simplest fastest version, i.e. using a one row animation per state (finally I figured out that I can export from Fragmotion an animation sequence corresponding to one angle fine in uniform arrangement, then a little script I just made can merge the 8 png/tga files), and I can set the entity->frame to desired animation and camera compensated angle easily. but I'm happy with that I could make this animation shader of the grid sprite anyway

that OVERRIDE flag also looks interesting to play with, but I'm not really familiar with material events...