UE5 Materials

Best practices for material creation and organization in Unreal Engine 5.

Naming Convention

Prefix	Asset Type
M_	Material
MI_	Material Instance
MF_	Material Function
MPC_	Material Parameter Collection

Examples: M_Rock_Master, MI_Rock_Mossy, MF_WorldAlignedTexture

Folder Organization

code

Content/
└── ProjectName/
    └── MaterialLibrary/        # Shared/global materials
        ├── Master/             # Master materials
        ├── Functions/          # Material functions
        ├── Instances/          # Common instances
        └── ParameterCollections/

Master Material Design

Create versatile master materials with static switches:

code

M_Environment_Master
├── [Switch] Use Normal Map
├── [Switch] Use Roughness Map
├── [Switch] Use Metallic Map
├── [Switch] Enable Parallax
├── [Switch] Enable Detail Textures
└── Parameters...

Static switches compile out unused features - no runtime cost.

Parameter Organization

Use numbered prefixes for consistent parameter ordering:

Prefix	Category
00	Base Color
01	Normal
02	Roughness
03	Metallic
04	Emissive
05	Tiling/UV
06	Detail
07	Special

Example parameter names:

•00_BaseColor
•01_NormalIntensity
•02_RoughnessMin
•02_RoughnessMax

Material Parameter Collections (MPCs)

Global parameters accessible by any material:

cpp

// In C++ or Blueprint
UMaterialParameterCollection* MPC = LoadObject<UMaterialParameterCollection>(...);
UKismetMaterialLibrary::SetScalarParameterValue(World, MPC, "GlobalWetness", 0.5f);

Rule	Details
Max 2 MPCs per material	Performance limit
Use for global effects	Weather, time of day, etc.
Avoid per-object data	Use Material Instances instead

Material Instances

Always use Material Instances, not material copies

code

M_Character_Master          # Master material
├── MI_Character_Player     # Player instance
├── MI_Character_Enemy_01   # Enemy variant
└── MI_Character_Enemy_02   # Enemy variant

Benefits:

•Shared shader compilation
•Easy parameter tweaking
•Reduced memory usage

Material Functions

Reusable node groups:

code

MF_WorldAlignedTexture     # Common triplanar projection
MF_HeightBlend             # Landscape layer blending
MF_Fresnel_Custom          # Custom fresnel calculation

Best Practices

Practice	Reason
Use Material Instances	Not duplicate materials
Static switches over dynamic	Compiles out unused code
Material Functions for reuse	Maintainable node graphs
Limit MPCs to 2 per material	GPU performance
Numbered parameter groups	Consistent UI ordering

Anti-Patterns

Avoid	Why
Over-featured master materials	Shader permutation bloat
Copying materials for variants	Memory waste
Too many dynamic switches	Runtime cost
Excessive texture samples	Performance

Performance Tips

•Use texture packing (ORM)
•Limit instruction count
•Use LOD for material complexity
•Profile with Shader Complexity view

Documentation: https://dev.epicgames.com/documentation/en-us/unreal-engine/instanced-materials-in-unreal-engine