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Class: MeshMaterial ​

Defined in: libs/scene/src/material/meshmaterial.ts:126

Base class for mesh materials.

Key responsibilities:

  • Defines feature-based shader variants (alpha test, blending, alpha-to-coverage, TAA toggle, etc.).
  • Provides a material instancing mechanism (per-instance uniforms via a shared core material).
  • Implements the base shader scaffolding for multiple render passes (LIGHT, DEPTH, OBJECT_COLOR, SHADOWMAP).
  • Updates render states depending on pass and features (blending, depth, culling).
  • Submits material uniforms and cooperates with OIT/TAA/SSR/motion vectors.

Variant system:

  • Features are stored in _featureStates and hashed into _createHash().
  • Changing features calls useFeature(...) which triggers optionChanged(true) to rebuild programs.

Instancing:

  • defineInstanceUniform registers per-instance fields with packed layout.
  • createInstance() returns a lightweight instance that shares the core’s GPU programs and updates instance uniform buffer only. This improves batching/instancing support.

Shader hooks:

  • vertexShader(scope) and fragmentShader(scope) provide per-pass hook points to implement the material’s vertex/fragment logic. The base class wires up common I/O (skin, morph, instancing).
  • outputFragmentColor(...) centralizes final color output across passes, handling OIT and alpha ops.

Render states and queues:

  • updateRenderStates(...) sets depth/blend/cull states based on blending, alpha-to-coverage, depth equality optimizations, pass type, and optional OIT overrides.
  • getQueueType() chooses between opaque and transparent queues.

Extending:

  • Override vertexShader, fragmentShader, and optionally outputFragmentColor.
  • Override supportLighting, isTransparentPass, needFragmentColor, etc., as needed.
  • Use uniformChanged() when changing uniform-only values that do not alter shader variants.
  • Use useFeature() when toggling options that affect shader variants.

Extends ​

Extended by ​

Implements ​

  • Clonable<MeshMaterial>

Constructors ​

Constructor ​

new MeshMaterial(): MeshMaterial

Defined in: libs/scene/src/material/meshmaterial.ts:187

Create a MeshMaterial with default opaque settings.

Defaults:

  • blendMode = 'none'
  • cullMode = 'back'
  • opacity = 1
  • alphaCutoff = 0
  • taaStrength = 1 - 1/16

Returns ​

MeshMaterial

Overrides ​

Material.constructor

Accessors ​

disposed ​

Get Signature ​

get disposed(): boolean

Defined in: libs/base/dist/index.d.ts:6065

Returns ​

boolean

Inherited from ​

Material.disposed

changeTag ​

Get Signature ​

get changeTag(): number

Defined in: libs/scene/src/material/material.ts:164

Incremented when the material’s GPU-relevant state changes and render bundles may need to be rebuilt.

Returns ​

number

Inherited from ​

Material.changeTag

instanceId ​

Get Signature ​

get instanceId(): number

Defined in: libs/scene/src/material/material.ts:170

Runtime-unique numeric identifier for the material instance.

Returns ​

number

Inherited from ​

Material.instanceId

numPasses ​

Get Signature ​

get numPasses(): number

Defined in: libs/scene/src/material/material.ts:180

Number of rendering passes this material uses.

Increasing this will expand the per-pass hash cache; make sure to implement createHash(pass), _createProgram(pb, ctx, pass), and updateRenderStates(pass, ...) accordingly for each pass.

Returns ​

number

Set Signature ​

set numPasses(val): void

Defined in: libs/scene/src/material/material.ts:183

Parameters ​
val ​

number

Returns ​

void

Inherited from ​

Material.numPasses

coreMaterial ​

Get Signature ​

get coreMaterial(): this

Defined in: libs/scene/src/material/material.ts:264

Returns the core material that owns GPU state.

Instances may delegate to a shared core to reuse compiled programs and caches.

Returns ​

this

Inherited from ​

Material.coreMaterial

drawContext ​

Get Signature ​

get drawContext(): DrawContext

Defined in: libs/scene/src/material/meshmaterial.ts:508

Draw context captured during program creation, available inside shader hooks.

Returns ​

DrawContext

The last DrawContext used to build or apply this material.

pass ​

Get Signature ​

get pass(): number

Defined in: libs/scene/src/material/meshmaterial.ts:517

Current material pass index during program building. Typically used inside shader hooks to select per-pass logic.

Returns ​

number

The active pass index while building the program, or -1 when idle.

alphaCutoff ​

Get Signature ​

get alphaCutoff(): number

Defined in: libs/scene/src/material/meshmaterial.ts:526

Alpha test cutoff in [0, 1].

  • 0 disables alpha testing.
  • > 0 discards fragments with alpha < cutoff. Changing this marks uniforms dirty (no shader rebuild).
Returns ​

number

Set Signature ​

set alphaCutoff(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:529

Parameters ​
val ​

number

Returns ​

void

alphaDither ​

Get Signature ​

get alphaDither(): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:541

Whether alpha clipping uses frame-varying dither coverage.

  • Effective only when alpha cutoff is enabled.
  • Intended for masked materials (blendMode='none') to emulate soft transparency with TAA.
Returns ​

boolean

Set Signature ​

set alphaDither(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:544

Parameters ​
val ​

boolean

Returns ​

void

TAADisabled ​

Get Signature ​

get TAADisabled(): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:555

Whether TAA is disabled for this material.

  • When true, motion vectors encode a large sentinel to skip TAA accumulation.
  • Managed via an internal feature toggle.
Returns ​

boolean

Set Signature ​

set TAADisabled(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:558

Parameters ​
val ​

boolean

Returns ​

void

TAAStrength ​

Get Signature ​

get TAAStrength(): number

Defined in: libs/scene/src/material/meshmaterial.ts:566

TAA strength in [0, 1].

  • Higher values generally imply stronger accumulation.
  • The value is mapped when writing motion-vector outputs during depth pass.
Returns ​

number

Set Signature ​

set TAAStrength(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:569

Parameters ​
val ​

number

Returns ​

void

alphaToCoverage ​

Get Signature ​

get alphaToCoverage(): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:581

Alpha-to-coverage toggle.

  • Useful to approximate transparency for MSAA targets.
  • Managed as a shader feature; toggling rebuilds variants.
Returns ​

boolean

Set Signature ​

set alphaToCoverage(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:584

Parameters ​
val ​

boolean

Returns ​

void

blendMode ​

Get Signature ​

get blendMode(): BlendMode

Defined in: libs/scene/src/material/meshmaterial.ts:592

Blending mode of this material.

  • 'none' for opaque, 'blend' for standard alpha, 'additive' for emissive FX.
  • Changing the mode toggles an internal feature and rebuilds variants.
Returns ​

BlendMode

Set Signature ​

set blendMode(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:595

Parameters ​
val ​

BlendMode

Returns ​

void

transparentShadowCaster ​

Get Signature ​

get transparentShadowCaster(): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:606

Whether transparent visible materials cast shadow through a masked shadow-only path.

  • Visible rendering stays blended.
  • Shadow-map rendering is treated like a cutout material using shadowAlphaCutoff.
Returns ​

boolean

Set Signature ​

set transparentShadowCaster(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:609

Parameters ​
val ​

boolean

Returns ​

void

shadowAlphaCutoff ​

Get Signature ​

get shadowAlphaCutoff(): number

Defined in: libs/scene/src/material/meshmaterial.ts:618

Alpha cutoff used by the shadow-only masked caster path.

Returns ​

number

Set Signature ​

set shadowAlphaCutoff(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:621

Parameters ​
val ​

number

Returns ​

void

cullMode ​

Get Signature ​

get cullMode(): FaceMode

Defined in: libs/scene/src/material/meshmaterial.ts:632

Face culling mode: 'none' | 'front' | 'back'.

  • Does not force shader rebuild; affects rasterizer state.
Returns ​

FaceMode

Set Signature ​

set cullMode(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:635

Parameters ​
val ​

FaceMode

Returns ​

void

opacity ​

Get Signature ​

get opacity(): number

Defined in: libs/scene/src/material/meshmaterial.ts:645

Material opacity in [0, 1].

  • Used in transparent passes. Changing marks uniforms dirty only.
Returns ​

number

Set Signature ​

set opacity(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:648

Parameters ​
val ​

number

Returns ​

void

objectColor ​

Get Signature ​

get objectColor(): Immutable<Vector4>

Defined in: libs/scene/src/material/meshmaterial.ts:659

Per-object color used for GPU picking/object-ID pass.

  • Changing marks uniforms dirty only.
Returns ​

Immutable<Vector4>

Set Signature ​

set objectColor(val): void

Defined in: libs/scene/src/material/meshmaterial.ts:662

Parameters ​
val ​

Immutable<Vector4>

Returns ​

void

Methods ​

on() ​

on<K>(type, listener, context?): void

Defined in: libs/base/dist/index.d.ts:594

IEventTarget.on

Type Parameters ​

K ​

K extends "dispose"

Parameters ​

type ​

K

listener ​

EventListener<{ dispose: []; }, K>

context? ​

unknown

Returns ​

void

Inherited from ​

Material.on

once() ​

once<K>(type, listener, context?): void

Defined in: libs/base/dist/index.d.ts:598

IEventTarget.once

Type Parameters ​

K ​

K extends "dispose"

Parameters ​

type ​

K

listener ​

EventListener<{ dispose: []; }, K>

context? ​

unknown

Returns ​

void

Inherited from ​

Material.once

off() ​

off<K>(type, listener?, context?): void

Defined in: libs/base/dist/index.d.ts:602

IEventTarget.off

Type Parameters ​

K ​

K extends "dispose"

Parameters ​

type ​

K

listener? ​

EventListener<{ dispose: []; }>

context? ​

unknown

Returns ​

void

Inherited from ​

Material.off

dispatchEvent() ​

dispatchEvent<K>(type, ...args): void

Defined in: libs/base/dist/index.d.ts:606

IEventTarget.dispatchEvent

Type Parameters ​

K ​

K extends "dispose"

Parameters ​

type ​

K

args ​

...object[K]

Returns ​

void

Inherited from ​

Material.dispatchEvent

dispose() ​

dispose(): void

Defined in: libs/base/dist/index.d.ts:6066

Returns ​

void

Inherited from ​

Material.dispose

supportInstancing() ​

supportInstancing(): boolean

Defined in: libs/scene/src/material/material.ts:230

Whether this material supports hardware instancing.

Override and return false if per-instance data is not supported in the shader.

Returns ​

boolean

Inherited from ​

Material.supportInstancing

isBatchable() ​

isBatchable(): boolean

Defined in: libs/scene/src/material/material.ts:234

Returns true if this is a instance of material

Returns ​

boolean

Inherited from ​

Material.isBatchable

needSceneColor() ​

needSceneColor(): boolean

Defined in: libs/scene/src/material/material.ts:241

Whether this material requires the scene color texture (e.g., for refraction).

Returns ​

boolean

Inherited from ​

Material.needSceneColor

needSceneDepth() ​

needSceneDepth(): boolean

Defined in: libs/scene/src/material/material.ts:247

Whether this material requires the linear scene depth texture (e.g., for depth-aware effects).

Returns ​

boolean

Inherited from ​

Material.needSceneDepth

applyUniforms() ​

applyUniforms(bindGroup, ctx, needUpdate, pass): void

Defined in: libs/scene/src/material/material.ts:415

Conditionally update uniforms/resources into the material bind group.

Delegates to _applyUniforms() when needUpdate is true (based on _optionTag check).

Parameters ​

bindGroup ​

BindGroup

Material bind group at index 2 (may be null if program has no layout).

ctx ​

DrawContext

Draw context.

needUpdate ​

boolean

Whether uniforms need to be refreshed.

pass ​

number

Pass index.

Returns ​

void

Inherited from ​

Material.applyUniforms

clearCache() ​

clearCache(): void

Defined in: libs/scene/src/material/material.ts:440

Returns ​

void

Inherited from ​

Material.clearCache

passToHash() ​

passToHash(pass): string

Defined in: libs/scene/src/material/material.ts:456

Convert a pass index to a hash seed string.

Subclasses may override to encode per-pass role (e.g., "depth", "forward", "shadow").

Parameters ​

pass ​

number

Pass number.

Returns ​

string

String used when building full hash.

Inherited from ​

Material.passToHash

drawPrimitive() ​

drawPrimitive(pass, primitive, ctx, numInstances): void

Defined in: libs/scene/src/material/material.ts:484

Issue the actual draw call for a pass.

Override for custom per-pass draw behavior if necessary. The default implementation:

  • Draws instanced if numInstances > 0.
  • Else uses ctx.instanceData.numInstances if available.
  • Else issues a non-instanced draw.

Parameters ​

pass ​

number

Pass number.

primitive ​

Primitive

Primitive to draw.

ctx ​

DrawContext

Draw context.

numInstances ​

number

Explicit instance count (0 = auto).

Returns ​

void

Inherited from ​

Material.drawPrimitive

onDispose() ​

protected onDispose(): void

Defined in: libs/scene/src/material/material.ts:499

Dispose the material and release GPU-side resource references.

  • Unregisters from the global registry.
  • Disposes the per-material bind groups kept in _states.

Returns ​

void

Inherited from ​

Material.onDispose

clone() ​

clone(): MeshMaterial

Defined in: libs/scene/src/material/meshmaterial.ts:209

Create a shallow clone of this material. Subclasses should override to copy custom fields.

Returns ​

MeshMaterial

Implementation of ​

Clonable.clone

Overrides ​

Material.clone

copyFrom() ​

copyFrom(other): void

Defined in: libs/scene/src/material/meshmaterial.ts:220

Copy common MeshMaterial properties from another material. Call super.copyFrom(other) first when overriding in subclasses.

Parameters ​

other ​

this

Source material.

Returns ​

void

Overrides ​

Material.copyFrom

apply() ​

apply(ctx): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:241

Capture the active draw context for both cached and freshly-built program paths.

The shader-building hooks access this.drawContext, but uniform application may also consult it on subsequent frames when the GPU program is reused from cache. Updating it here keeps material mixins in sync even when createProgram() is skipped.

Parameters ​

ctx ​

DrawContext

Current draw context.

Returns ​

boolean

Whether material preparation succeeded.

Overrides ​

Material.apply

uniformChanged() ​

uniformChanged(): void

Defined in: libs/scene/src/material/meshmaterial.ts:250

Mark uniform-only changes so uniforms are re-uploaded on next apply, without rebuilding shader programs.

Returns ​

void

defineFeature() ​

static defineFeature(): number

Defined in: libs/scene/src/material/meshmaterial.ts:257

Define a new feature bit/index for shader variants. Subclasses may use this to add their own switches.

Returns ​

number

defineInstanceUniform() ​

static defineInstanceUniform(prop, type, name?): number

Defined in: libs/scene/src/material/meshmaterial.ts:290

Define a per-instance uniform for this class.

Returns a compact index encoding the vector index and component offset, which can be used in shader code via getInstancedUniform(...).

Parameters ​

prop ​

string

Property name exposed on instances.

type ​

InstanceUniformType

Uniform data type.

name? ​

string = ''

Returns ​

number

Encoded index for use in getInstancedUniform.

Throws ​

If the property is already defined or type is invalid.

getInstancedUniform() ​

getInstancedUniform(scope, uniformIndex): PBShaderExp

Defined in: libs/scene/src/material/meshmaterial.ts:331

Read an encoded per-instance uniform in shader code.

Encoded index packs: vector index, component offset, and component count.

Parameters ​

scope ​

PBInsideFunctionScope

Inside-function shader scope.

uniformIndex ​

number

Encoded index from defineInstanceUniform.

Returns ​

PBShaderExp

The shader expression reading the selected components.

getInstancedUniforms() ​

getInstancedUniforms(): object[]

Defined in: libs/scene/src/material/meshmaterial.ts:353

Get the list of per-instance uniforms for this material class.

Returns ​

object[]

createInstance() ​

createInstance(): this

Defined in: libs/scene/src/material/meshmaterial.ts:368

Create a material instance (preferred for GPU instancing).

  • On WebGL1 (or when instancing unsupported), falls back to cloning.
  • Otherwise, returns a proxy instance that shares GPU programs and stores per-instance uniforms in a compact Float32Array.

The returned instance:

  • Exposes properties defined by defineInstanceUniform with getter/setter that read/write the packed buffer and notify RenderBundleWrapper.
  • Delegates methods to the core material via prototype chain.

Returns ​

this

Overrides ​

Material.createInstance

supportLighting() ​

supportLighting(): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:674

Whether this material responds to scene lighting. Override to return false for unlit materials.

Returns ​

boolean

True if lighting affects this material; otherwise false.

Overrides ​

Material.supportLighting

getEffectiveBlendMode() ​

protected getEffectiveBlendMode(pass, ctx?): BlendMode

Defined in: libs/scene/src/material/meshmaterial.ts:681

Returns the effective blend mode for the current pass. Transparent-shadow-caster materials stay blended in visible passes, but become masked in shadow passes.

Parameters ​

pass ​

number

ctx? ​

DrawContext

Returns ​

BlendMode

getActiveAlphaCutoff() ​

protected getActiveAlphaCutoff(ctx?, pass?): number

Defined in: libs/scene/src/material/meshmaterial.ts:694

Returns the alpha cutoff that should be used for the current pass.

Parameters ​

ctx? ​

DrawContext

pass? ​

number = ...

Returns ​

number

useTransparentShadowCaster() ​

useTransparentShadowCaster(ctx?, _pass?): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:700

Whether the current pass should use the shadow-only masked caster path.

Parameters ​

ctx? ​

DrawContext

_pass? ​

number = ...

Returns ​

boolean

useTransparentShadowCasterForPass() ​

useTransparentShadowCasterForPass(renderPassType?): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:706

Whether the specified render pass type should reinterpret this transparent material as a masked shadow caster.

Parameters ​

renderPassType? ​

number

Returns ​

boolean

usesAlphaCutoff() ​

protected usesAlphaCutoff(ctx?, pass?): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:716

Whether this pass needs an alpha-cutoff uniform bound.

Parameters ​

ctx? ​

DrawContext

pass? ​

number = ...

Returns ​

boolean

needFragmentColorInput() ​

needFragmentColorInput(ctx?): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:724

Whether this pass needs fragment color inputs. This stays aligned with the historical meaning of needFragmentColor, but also allows shadow-only transparent casters to fetch alpha sources.

Parameters ​

ctx? ​

DrawContext

Returns ​

boolean

updateRenderStates() ​

protected updateRenderStates(pass, stateSet, ctx): void

Defined in: libs/scene/src/material/meshmaterial.ts:737

Update render states per pass and draw context. Sets blending, alpha-to-coverage, depth test/write, cull mode, color mask, and cooperates with OIT.

Parameters ​

pass ​

number

Current material pass index.

stateSet ​

RenderStateSet

Render state set to update.

ctx ​

DrawContext

Current draw context.

Returns ​

void

void

Overrides ​

Material.updateRenderStates

applyUniformValues() ​

applyUniformValues(bindGroup, ctx, pass): void

Defined in: libs/scene/src/material/meshmaterial.ts:806

Submit material uniforms/resources to the material bind group (set 2). Handles alpha cutoff, opacity (non-instanced transparent), OIT, object color, and TAA strength.

Parameters ​

bindGroup ​

BindGroup

The material bind group to write into.

ctx ​

DrawContext

Current draw context.

pass ​

number

Current material pass index.

Returns ​

void

void

getQueueType() ​

getQueueType(): number

Defined in: libs/scene/src/material/meshmaterial.ts:830

Determine the render queue for this material. Transparent materials are queued as QUEUE_TRANSPARENT, otherwise QUEUE_OPAQUE.

Returns ​

number

The queue type constant.

Overrides ​

Material.getQueueType

isTransparentPass() ​

isTransparentPass(pass, ctx?): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:840

Whether the given pass is transparent. Default returns true when blendMode !== 'none'.

Parameters ​

pass ​

number

Material pass index.

ctx? ​

DrawContext

Returns ​

boolean

True if the pass is transparent; otherwise false.

Overrides ​

Material.isTransparentPass

featureUsed() ​

featureUsed<T>(feature): T

Defined in: libs/scene/src/material/meshmaterial.ts:867

Query a feature flag’s current value.

Type Parameters ​

T ​

T = unknown

Expected value type.

Parameters ​

feature ​

number

The feature index.

Returns ​

T

The current value for the feature, typed as T.

useFeature() ​

useFeature(feature, use): void

Defined in: libs/scene/src/material/meshmaterial.ts:878

Enable or disable a feature and trigger variant rebuild when changed. Calls optionChanged(true) internally on change.

Parameters ​

feature ​

number

The feature index to set.

use ​

unknown

The new feature value (typed by convention).

Returns ​

void

void

needFragmentColor() ​

needFragmentColor(ctx?): boolean

Defined in: libs/scene/src/material/meshmaterial.ts:917

Whether the fragment shader needs to compute color. Returns true for LIGHT pass, or when alpha test or alpha-to-coverage is enabled. Override if the material writes color in other passes.

Parameters ​

ctx? ​

DrawContext

Optional draw context; defaults to the last captured drawContext.

Returns ​

boolean

True if fragment color computation is needed; otherwise false.

vertexShader() ​

vertexShader(scope): void

Defined in: libs/scene/src/material/meshmaterial.ts:934

Vertex shader hook. Prepares common inputs (skin/morph/instancing), varyings, and pass-dependent outputs. Override to implement per-vertex logic; use ShaderHelper as needed.

Parameters ​

scope ​

PBFunctionScope

Vertex shader function scope.

Returns ​

void

void

fragmentShader() ​

fragmentShader(scope): void

Defined in: libs/scene/src/material/meshmaterial.ts:969

Fragment shader hook. Declares pass-dependent uniforms (e.g., opacity, objectColor, alphaCutoff). Override to implement per-fragment logic, and call outputFragmentColor to finalize writes.

Parameters ​

scope ​

PBFunctionScope

Fragment shader function scope.

Returns ​

void

void

outputFragmentColor() ​

outputFragmentColor(scope, worldPos, color, ssrRoughness?, ssrNormal?, sssProfile?, sssParams?, sssDiffuse?, sssTransmission?, sssProfileEnabled?, skinSSS?): void

Defined in: libs/scene/src/material/meshmaterial.ts:1069

Centralized final color write and per-pass output composition.

Behavior by pass:

  • LIGHT: clipping, alpha handling, optional OIT integration, fog application, color output encoding.
  • DEPTH: encoded depth; optional motion vectors (TAA enabled/disabled handling).
  • OBJECT_COLOR: object color and distance output (linear depth or world-pos + distance).
  • SHADOWMAP: writes shadow depth via light’s shadow implementation.

Also writes SSR roughness/normal buffers when requested via material flags.

Parameters ​

scope ​

PBInsideFunctionScope

Inside-function shader scope.

worldPos ​

PBShaderExp

Fragment world-space position expression.

color ​

PBShaderExp

Lit fragment color expression; may be undefined for depth-only paths.

ssrRoughness? ​

PBShaderExp

Optional SSR roughness output expression.

ssrNormal? ​

PBShaderExp

Optional SSR normal output expression.

sssProfile? ​

PBShaderExp

Optional SSS profile output expression.

sssParams? ​

PBShaderExp

Optional SSS packed params output expression.

sssDiffuse? ​

PBShaderExp

Optional diffuse-only lighting color for SSS composition.

sssTransmission? ​

PBShaderExp

Optional thin-shell transmission lighting color for SSS composition.

sssProfileEnabled? ​

boolean = false

True only when this material should write SSS profile data.

skinSSS? ​

PBShaderExp

Returns ​

void

void

Released under the MIT License.

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