FPOM with RVT landscapes using RVT Displacement

FPOM RVT node allows you to achieve POM using a single RVT Displacement texture sample. This is useful for landscapes since you can write all the layers to a single virtual texture, and then at render time only read that one texture.

RVT Displacement - UE 5.4+

RVT Displacement feature was first added in 5.4, and is required for FPOM RVT to work.

Setup

1. Create a new Runtime Virtual Texture and set it to use Displacement
2. Add a new Runtime Virtual Texture Volume to your landscape and assign the RVT_Displacement asset
3. Add the RVT_Displacement to your landscape list Draw in Virtual Textures

Landscape Material - Output

1. Pipe the material Displacement and hook it up to the Runtime Virtual Texture Output Displacement channel

Landscape Material - Sample

1. Add a Runtime Virtual Texture Sample node, set it to use RVT_Displacement asset and set Virtual Texture Content to Displacement
2. Add a Constant3Vector node and add the Location of the Runtime Virtual Texture Volume to it
3. Add a Constant3Vector node and add the Scale of the Runtime Virtual Texture Volume to it
4. Add a Constant node and set it to 0.001 for now
5. Add a FPOM RVT node and connect the four nodes as shown in the image bellow
6. Add a Absolute World Position node and do a Add with it and FPOMs WorldPositionOffset output
7. Hook the output of this into the Runtime Virtual Texture Sample (BaseColor, etc) World Position input

Virtual Textures

RVT loads parts in a tiled page layout. Everything is not loaded the whole time like a normal Height Texture is. This can cause some loading popping when the RVT pages are loading. And is a side effect with RVT that can't be avoided.