get normal for pyro displacement

[wateryfield]

Hi, everyone.

I have a fog volume with pyro materia have to render, the defaut render looks not good enough, so i have to modify the materia by turn on the displacement . But the pyro displacement need the Normal field, how can i get the normal?

I just transfer the polygon normal to the fog volume simeply, it works,but looks not properly.

I get some tip in forum,but i can not set it to work.

Anyone who give a help will be great.

Thanks.

 

 

 

get_normal.hip

[Skybar]

You can't get normals in your volume that way. You want a field for that, specifically a vector field, which points in the right direction. With an SDF that is easy because it is negative inside and positive outside (or the other way around, i never remember). So you want to get the gradient of your density field, a gradient points to increasing values. Because it is an SDF then it will act as a normal for your volume.

 

Here is a hip for that, and since I cant remember how an SDF works you can disable/enable the Volume Mix SOP to invert the normal field. You then of course specify it in your shader to use for displacement.

 

get_normal_dv.hipnc