[MaterialType] defnitions and serializations

[Hinageshi01]

What we have for now

MaterialImpl.h:

MaterialID m_id;

Each Mesh has a MaterialID, which can get a Material from SceneDatabase.

std::string m_name;

Name of Material.

TextureIDMap m_textureIDs;

Each Material has a std::map<MaterialTextureType, TextureID>, which can get TextureID by specified MaterialTextureType.
After that we can use TextureID to get a actural texture path from SceneDatabase.

What O3DE have

At the begining, we can refer to the BasePBR material type of O3DE.
BasePBR.materialtype

An explanation of the properties can be found here:
PBR Shading Model

Each PropertyGroup has several property and each property has several attribute including:

• id
• name
• description
• type
• default value
• a link to a variable in one of the shaders referenced by the .materialtype file.
• ...

The icon √ means that it's necessary for us to serialize this property.

BaseColor

BaseColorPropertyGroup.json

properties:

• color √
• factor √
• textureMap √
• useTexture √
• textureMapUv
• textureBlendMode

Metallic

MetallicPropertyGroup.json

properties:

• factor √
• textureMap √
• useTexture √
• textureMapUv

Roughness

RoughnessPropertyGroup.json

properties:

• textureMap √
• useTexture √
• textureMapUv
• lowerBound
• upperBound
• factor √

Specular

SpecularPropertyGroup.json

properties:

• factor
• textureMap
• useTexture
• textureMapUv
• enableMultiScatterCompensation

Normal

NormalPropertyGroup.json

properties:

• textureMap √
• useTexture √
• textureMapUv
• flipX
• flipY
• factor

Uv

UvPropertyGroup.json

properties:

• center
• tileU
• tileV
• offsetU
• offsetV
• rotateDegrees
• scale

Irradiance

IrradiancePropertyGroup.json

// Note: this property group is used in the DiffuseGlobalIllumination pass, it is not read by the shaders

We can ignore this PropertyGroup for now.

General Settings

GeneralCommonPropertyGroup.json

properties:

• doubleSided
• applySpecularAA
• enableShadows
• castShadows
• enableDirectionalLights √
• enablePunctualLights √
• enableAreaLights
• enableIBL √
• forwardPassIBLSpecular

How can we expand our Material Sysyem

#122