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landscape-auto-material Create production-quality landscape materials with the master-material + material-function + material-instance paradigm, RVT, and auto-layering. Use when the user asks for an auto/procedural landscape material, slope/altitude/distance-based layer blending, Runtime Virtual Textures, biome configuration via instances, or layer material functions. For basic layer-blend materials load landscape-materials.
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8 archivos architecture-details.md 3.8 KB biomes-and-templates.md 4.4 KB material-functions.md 2.0 KB parameter-reference.md 4.4 KB reference-example.md 2.1 KB name landscape-auto-material display_name Landscape Auto-Material System description Create production-quality landscape materials with the master-material + material-function + material-instance paradigm, RVT, and auto-layering. Use when the user asks for an auto/procedural landscape material, slope/altitude/distance-based layer blending, Runtime Virtual Textures, biome configuration via instances, or layer material functions. For basic layer-blend materials load landscape-materials. vibeue_classes ["MaterialService","MaterialNodeService","LandscapeMaterialService","RuntimeVirtualTextureService"] unreal_classes ["MaterialExpressionMaterialFunctionCall","MaterialExpressionRuntimeVirtualTextureOutput","MaterialExpressionRuntimeVirtualTextureSample","RuntimeVirtualTexture","RuntimeVirtualTextureVolume","MaterialFunction","MaterialInstanceConstant","LandscapeLayerInfoObject","MaterialExpressionFunctionInput","MaterialExpressionFunctionOutput"] keywords ["auto material","auto layer","master material","material function","material instance","runtime virtual texture","RVT","altitude blend","slope blend","distance blend","biome","landscape material","layer function","production landscape workflow","parametric material","function input","function output","bulk parameters"]
Landscape Auto-Material System Skill
When to Use This Skill
Use this skill when you need production-quality landscape materials with:
A master material → material instance workflow (artists change parameters, not graphs)
Automatic layer blending by slope, altitude, or distance
Material functions for reusable logic (layer sampling, color correction, etc.)
Runtime Virtual Textures for scalable landscape rendering
Biome configuration through material instances (swap textures/thresholds, same master)
For simple prototyping with 2-5 painted layers, load the landscape-materials skill instead (the engine's AgentSkillToolset GetSkills exposes it).
Architecture Overview
The Master Material Paradigm
Master Material (M_Landscape_Master)
├── Material Functions (reusable logic blocks)
│ ├── MF_AutoLayer ── auto-selects layers by altitude/slope
│ ├── MF_Slope_Blend ── slope mask (0=flat, 1=steep)
│ ├── MF_Altitude_Blend ── height mask (0=below, 1=above)
│ ├── MF_Layer_Grass ── per-layer texture sampling
│ ├── MF_Layer_Rock ── per-layer texture sampling
│ ├── MF_RVT ── Runtime Virtual Texture output
│ └── MF_Distance_Blend ── LOD transitions
├── Exposed Parameters (50+ scalar/vector/texture/switch)
└── Material Outputs (BaseColor, Normal, Roughness, WPO, RVT)
Material Instance (MI_Landscape_Biome_01)
├── Inherits master material graph
├── Overrides parameters only (no graph editing)
└── Different biomes = different instances of same master
Why this is better than manual graph building:
Reusability : Material functions used across multiple mastersArtist-friendly : Biome artists edit parameters in instances, never touch the graphPerformance : Compiled once in master, instances are cheapMaintainability : Fix a function → all materials using it update
Critical Rules
🚨 Inspect Before Modifying Existing Materials or Functions
Before modifying an existing master material or material function, MUST export and review its current state:
import unreal, json
graph = json.loads(unreal.MaterialNodeService.export_material_graph("/Game/Materials/M_Landscape_Master" ))
print (f"Expressions: {len (graph['expressions' ])} , Connections: {len (graph['connections' ])} "
for
in
'expressions'
'parameter_name'
or
'function_path'
or
'class'
print
f" [{expr['id' ]} ] {expr['class' ]} - {name} "
"/Game/Functions/MF_AutoLayer"
"/Game/Functions/MF_AutoLayer"
Why: Auto-material master graphs can have 50+ expressions and complex function call chains. Adding nodes without reviewing first creates duplicates, broken connections, and compilation failures. Always export → review → plan → modify.
Four Services Work Together Service Role MaterialNodeService Material function creation/introspection, expression graphs MaterialService Material/instance creation, properties, bulk parameters LandscapeMaterialService CreateAutoMaterial, FindLandscapeTextures, layer infosRuntimeVirtualTextureService RVT assets, volumes, landscape assignment
⚠️ compile_material Is Slow — Use Separate Code Blocks Master materials with many function calls are very slow to compile. NEVER create + compile in the same block.
Block 1 : Create material, add functions, connect graph, saveBlock 2 : compile_material() alone (may take minutes)Block 3 : Create instances, set parameters, assign to landscape
⚠️ Enable Virtual Texturing on Material If using RVT, you MUST set bUsedWithVirtualTexturing = true on the master material:
unreal.MaterialService.set_property(mat_path, "bUsedWithVirtualTexturing" , "true" )
⚠️ Material Functions Must Be Saved Before Use After creating a material function and adding inputs/outputs, save it before calling it from a material:
unreal.EditorAssetLibrary.save_asset(func_path)
⚠️ Function Inputs/Outputs Need Sort Priority Set SortPriority to control pin ordering. Lower values appear first:
unreal.MaterialNodeService.add_function_input(func_path, "BaseColor" , "Vector3" , 0 )
unreal.MaterialNodeService.add_function_input(func_path, "Normal" , "Vector3" , 1 )
unreal.MaterialNodeService.add_function_input(func_path, "Roughness" , "Scalar" , 2 )
Sub-docs available Read these sibling files directly (the engine AgentSkillToolset GetSkills is the loader; this SKILL.md is the index, the deeper docs live alongside it):
Sub-doc What's inside reference-example.mdConcrete reference architecture: full master material function chain, biome instances, texture naming convention workflows.mdStep-by-step recipes: auto-material creation, biome instances, building/inspecting material functions, RVT setup material-functions.mdPatterns for common material functions (Slope_Blend, Altitude_Blend, Layer_*, RVT) + EFunctionInputType reference table architecture-details.mdDeep dive on the auto-layer function chain, mask combination math, slope/altitude function creation, extension points biomes-and-templates.mdBiome comparison table, static-switch feature toggles, naming conventions, standard layer function template (inputs/outputs/catalog) parameter-reference.mdFull parameter catalog: layer textures, auto-blend, distance/LOD, color correction, feature toggles, displacement, RVT, FindLandscapeTextures suffix matching rvt-setup.mdRVT material types, sizing guidelines, inspection code, common RVT issues with causes/fixes
Common Mistakes
1. Forgetting bUsedWithVirtualTexturing Material has RVT output node but rendering fails → set the property before compiling.
2. No RVT Volume Actor Material outputs to RVT but nothing reads it → create RuntimeVirtualTextureVolume covering the landscape.
3. RVT MaterialType Mismatch Volume expects BaseColor_Normal_Roughness but material only outputs BaseColor → types must match.
4. Not Saving Functions Before Referencing Create function → immediately create function call → fails because function not saved. Always save_asset() the function first.
5. Missing bExposeToLibrary Material function created but doesn't appear in the material editor's function library → set bExposeToLibrary=True.
6. Compiling in Same Block as Creation Master materials with many function calls take minutes to compile. Putting create + compile in one code block causes timeout.
7. Wrong Bulk Parameter Types set_instance_parameters_bulk requires exact type strings: "Scalar", "Vector", "Texture", "StaticSwitch". Typos silently skip parameters.
8. Static Switch Parameters Need UpdateStaticPermutation Static switches are compile-time. After setting via bulk set, the instance needs a static permutation update (handled internally by set_instance_parameters_bulk).
9. Auto Layer Has Zero Weights Landscape looks unpainted or auto-blend never appears when all layer weights are 0. Verify with get_weights_in_region and fill/paint the base auto layer at least once.
10. Layer Info/Material Family Mismatch If a landscape is switched to a different master/instance family, existing Layer Info assets may not match expected layer names/workflow. Recreate layer infos from the active material's layer list and reassign them.
11. RVT Volume Missing or Mis-sized RVT asset assignment alone is not enough. Ensure each landscape has an RVT volume covering its bounds; recreate volume per landscape after major transform/scale changes.
Related Skills Task Skills to Load Sculpt terrain only landscapeSimple painted material (2-5 layers) landscape + landscape-materialsAuto-blending material (production) landscape + landscape-auto-materialMaterial instances/biome configuration landscape-auto-materialMaterial functions (non-landscape) materialsFull pipeline (terrain + auto-material + RVT) landscape + landscape-auto-material
