Material

Abstract base class for material types.

This class is not intended to be used directly. Use one of the concrete material types such as PhongMaterial, UnlitMaterial, ShaderMaterial, or derive your own material implementation from this class.

Types

Material::Blending enum

Enumerates blending modes used for compositing this material.

Value	Description
None	No blending (default) fragments overwrite existing pixels.
Normal	Standard alpha blending.
Additive	Adds fragment color to the framebuffer color.
Subtractive	Subtracts fragment color from the framebuffer color.
Multiply	Multiplies fragment color by the framebuffer color.

Material::Depth enum

Enumerates depth comparison functions used for depth testing.

Value	Description
Less	Passes if the fragment depth is less than the stored depth.
Equal	Passes if the fragment depth is equal to the stored depth.
LessEqual	Passes if the fragment depth is less than or equal to the stored depth.
Greater	Passes if the fragment depth is greater than the stored depth.
GreaterEqual	Passes if the fragment depth is greater than or equal to the stored depth.
Always	Always passes regardless of depth value.
Never	Never passes regardless of depth value.

Material::Side enum

Enumerates which side of each polygon is rendered.

Value	Description
Front	Renders front faces only (default).
Back	Renders back faces only.
TwoSided	Renders both front and back faces.

Material::Type enum

Enumerates all supported material types.

Value	Description
BillboardMaterial	Specialized material for camera-facing billboards.
DepthMaterial	Renders depth only; used internally for shadow map passes.
PBRMaterial	Implements physically-based rendering with the metallic workflow.
PhongMaterial	Implements the Blinn–Phong lighting model.
ShaderMaterial	Uses a custom shader program for rendering.
UnlitMaterial	Renders without lighting; color appears as-is.
Length	Sentinel value representing the number of material types.

Properties

alpha_test float

Alpha threshold below which fragments are discarded.

Fragments whose final alpha (opacity combined with texture alpha) falls below this value are not rendered. Use for cutout surfaces such as foliage. Unlike transparent, discarded fragments write no depth and require no sorting. A value of 0 disables the test.

float alpha_test {0.0f};

blending Blending

Blending mode used when rendering this material.

Blending blending {Blending::Normal};

depth Depth

Depth function used for depth testing.

Depth depth {Depth::LessEqual};

depth_test bool

Enables depth testing.

bool depth_test {true};

flat_shaded bool

Enables flat shading.

bool flat_shaded {false};

fog bool

Enables scene fog for this material.

bool fog {true};

opacity float

Value in the range indicating how transparent the material is.

Blends the material with the framebuffer when transparency is enabled, and contributes to the alpha value tested against alpha_test. Has no effect when both are disabled.

float opacity {1.0f};

polygon_offset_factor float

Polygon offset factor used to mitigate z-fighting.

float polygon_offset_factor {0.0f};

polygon_offset_units float

Polygon offset units used to mitigate z-fighting.

float polygon_offset_units {0.0f};

side Side

Side of each polygon rendered by this material.

Side side {Side::Front};

transparent bool

Enables transparency for this material.

bool transparent {false};

visible bool

Controls whether this material is visible when rendering.

bool visible {true};

wireframe bool

Enables wireframe rendering.

bool wireframe {false};

Functions

GetType() Type pure virtual

Identifies the concrete Material::Type of this material.

virtual Type Material::GetType() const=0;

Material::TypeToString() std::string

Converts a material type value to a string.

Primarily intended for debugging and logging.

static std::string Material::TypeToString(Type type);

Parameter	Description
type	Material type enum value.