Exposed Material Parameters

PPG creates dynamic material instances for generated terrain and water chunks, then sets a fixed set of runtime parameters. You normally do not set these by hand, but material graphs need the matching parameter names when they consume runtime planet data.

Terrain Surface Parameters

These parameters are set on the Planet Material assigned in the Planet Data asset.

Name	Type	Purpose
BiomeMap	Texture	Per-chunk render target containing the three strongest biome IDs and strengths. Planet Biome Map Sample owns this fixed parameter; no separate parameter node is needed.
recursionLevel	Scalar	Chunk recursion distance from the Planet Data maximum recursion level.
PlanetRadius	Scalar	Planet radius from the Planet Data asset.
NoiseHeight	Scalar	Height scale from the Planet Data asset.
ChunkSize	Scalar	Current chunk size in Unreal units.
ComponentLocation	Vector	High part of the chunk origin. Kept for compatibility.
ComponentLocationHigh	Vector	High part of the chunk origin used by planet-position nodes.
ComponentLocationLow	Vector	Low part of the chunk origin.
ComponentLocationLWC	Double Vector	Large-world-coordinate chunk origin used by Planet Position LWC.
ChunkLocationHigh	Vector	High part of the chunk's planet-space location.
ChunkLocationLow	Vector	Low part of the chunk's planet-space location.
ChunkSizeHigh	Scalar	High part of chunk size used by Planet UVs.
ChunkSizeLow	Scalar	Low part of chunk size used by Planet UVs.
PlanetSpaceRotation	Vector	Integer cube-face rotation encoded as a vector.
PlanetPositionScale	Scalar	Planet Data Planet Position Scale, used by Planet Position nodes when enabled.
PPG_SurfaceBiomeEntryMap0	Vector	Internal remap for Planet Data biome indices 0-3 to surface material output entries.
PPG_SurfaceBiomeEntryMap1	Vector	Internal remap for Planet Data biome indices 4-7 to surface material output entries.
PPG_SurfaceBiomeEntryMap2	Vector	Internal remap for Planet Data biome indices 8-11 to surface material output entries.
PPG_SurfaceBiomeEntryMap3	Vector	Internal remap for Planet Data biome indices 12-15 to surface material output entries.
PPG_BiomeStrengthIndex_<expression>_<entry>	Scalar	Planet Data biome index bound to one named Planet Biome Strengths output. Unmatched names use -1.

The PPG_SurfaceBiomeEntryMap* parameters are generated from matching Planet Data biome names to Planet Biome Material Output entry names. The output node uses them to map raw Planet Data biome IDs to its own entry order.

The PPG_BiomeStrengthIndex_* parameters are generated from the stable expression and entry identities on Planet Biome Strengths. Every terrain chunk sets them from its own Planet Data asset, so multiple planets can share one parent surface material while using different biome lists or orders.

These are implementation parameters; do not set them manually or author gameplay logic against their generated names.

Water Parameters

These parameters are set on the active water material or far-water material.

Name	Type	Purpose
HeightMap	Texture	Per-chunk render target shared with terrain biome/height data for water displacement/material logic.
PlanetRadius	Scalar	Planet radius from the Planet Data asset.
ComponentLocation	Vector	High part of the chunk origin.
ComponentLocationHigh	Vector	High part of the chunk origin.
ComponentLocationLow	Vector	Low part of the chunk origin.
ComponentLocationLWC	Double Vector	Large-world-coordinate chunk origin.
ChunkLocationHigh	Vector	High part of the chunk's planet-space location.
ChunkLocationLow	Vector	Low part of the chunk's planet-space location.
ChunkSizeHigh	Scalar	High part of chunk size.
ChunkSizeLow	Scalar	Low part of chunk size.
PlanetSpaceRotation	Vector	Integer cube-face rotation encoded as a vector.
PlanetPositionScale	Scalar	Planet Data Planet Position Scale.

Cloud Parameters

When Update Volumetric Cloud Parameters runs, the spawner updates the cloud material:

Name	Type	Purpose
PlanetLocation	Vector	World location of the Planet Spawner actor.
PlanetRadius	Scalar	Planet radius from the Planet Data asset.

Parameters Created by PPG Material Nodes

Some PPG material nodes compile their own parameter references:

Name	Type	Used By
PlanetPositionScale	Scalar	Planet Position, Planet Position LWC
ComponentLocationHigh	Vector	Planet Position
ComponentLocationLWC	Double Vector	Planet Position LWC
ChunkLocationHigh / ChunkLocationLow	Vector	Planet UVs
ChunkSizeHigh / ChunkSizeLow	Scalar	Planet UVs
PlanetSpaceRotation	Vector	Planet UVs
BiomeMap	Texture	Planet Biome Map Sample
PPG_SurfaceBiomeEntryMap0..3	Vector	Planet Biome Material Output
PPG_BiomeStrengthIndex_<expression>_<entry>	Scalar	Planet Biome Strengths