Very hard balancing all the tech requirements with such a fluid game. Here is some imposter tech that may or may not end up being used.
This method makes the imposter functionally equivalent to a low lod model, although it is completely 2D like a billboard. Only efficient/worth it under very specific circumstances.
Functions by rendering the uv and normals into a billboard and then applying the original material. Does not handle texture seams well but that is relatively easy to avoid. Main benefit is that outside of shadows, it reacts properly to dynamic lighting.
This method makes the imposter functionally equivalent to a low lod model, although it is completely 2D like a billboard. Only efficient/worth it under very specific circumstances.
Functions by rendering the uv and normals into a billboard and then applying the original material. Does not handle texture seams well but that is relatively easy to avoid. Main benefit is that outside of shadows, it reacts properly to dynamic lighting.