I'm working on an animation which has a lot of natural landscapes, and I'm using a particle system to generate grass (Models that come with the Graswald addon). These frames take a long time to render and the process pretty untenable for a longer animation. Is there anything for hair/particle system which works in the same way as adaptive subdivision works for displacement? That is, render the grass which is up close with more detail and gradually tone it down the further it gets away from the camera?
I think the best way would be to have very low poly grasses with very low Res textures. But it's not very evident. In my knowledge, at the moment, there is not the equivalent of adaptive subdivision for the hair particle.
On the other hand, I noticed that former versions of Grasswald used less graphic-card memory, than newer, in rendering but it uses still more memory than low poly particles you can model yourself. To go further, the last Grasswald version has an adaptive weight painting depending on the camera's fieldview. But it doesn't works with videos because, when you change the weight painting, the particle system will randomly change each time you change this weight-painting. That's to say if your camera make a travelling, the particle system would randomly change on each frame.
I will make my video but only with grass micro-displacement texture (with adaptive subdivision) instead of any particle system.