I am trying to setup grain simulation. I have a flat grid that I deformed using mountain node and I extruded it. When I choose the mode 'solid', the grains don't appear in some areas. I am unable to understand why.

What do I do so that the entire volume gets filled?

the grain source node uses points from volume to scatter your points which scatters points by creating a 3dimensional grid. on your polyextrude you're using "transform extruded front" and extrude by 0.1 straight up on the y axis. since you have pretty steep and thin geometry it happens that the geometry falls in between the grid for scattering points resulting in no points being scattered there.

to solve that you can either decrease the point separation or set the polyextrude to extrude along normals

Thanks a lot! Now I understand. The extrusion was happening vertically, which is why the inclined areas were too thin. Extruding along the normals literally thickens the surface. The tutor suggested to avoid this method because the UVs get messed up like this.



Screenshot taken at 11mins 48 seconds.

https://youtu.be/rdm4tQLt-AA?t=708 [youtu.be]

Through trial and error, I increased the extrusion 'translate' in the 'front transform' option till the point the problem got solved . Is there a more accurate way to find the precise number so that I don't overload the grains with unnecessary high number? Similarly the grain

Now going back to the original 'problematic' less level of 'translate' values......

Didn't change the 'translate' factor in this.

Somewhat better but still there are vacant spaces


Problem solved but way too dense!