# Model

#### new Cesium.Model(options)
Scene/Model.js 373

A 3D model based on glTF, the runtime asset format for WebGL, OpenGL ES, and OpenGL.

Cesium includes support for geometry and materials, glTF animations, and glTF skinning. In addition, individual glTF nodes are pickable with `Scene#pick` and animatable with `Model#getNode`. glTF cameras and lights are not currently supported.

An external glTF asset is created with `Model.fromGltf`. glTF JSON can also be created at runtime and passed to this constructor function. In either case, the `Model#readyPromise` is resolved when the model is ready to render, i.e., when the external binary, image, and shader files are downloaded and the WebGL resources are created.

Cesium supports glTF assets with the following extensions:

- KHR_binary_glTF (glTF 1.0)
- KHR_materials_common (glTF 1.0)
- WEB3D_quantized_attributes (glTF 1.0)
- AGI_articulations
- KHR_blend (draft)
- KHR_draco_mesh_compression
- KHR_materials_pbrSpecularGlossiness
- KHR_materials_unlit
- KHR_techniques_webgl
- KHR_texture_transform

For high-precision rendering, Cesium supports the CESIUM_RTC extension, which introduces the CESIUM_RTC_MODELVIEW parameter semantic that says the node is in WGS84 coordinates translated relative to a local origin.

Name | Type | Description
--- | --- | ---

`options`

Object

optional Object with the following properties:

Name | Type | Default | Description
--- | --- | --- | ---
`gltf` | Object | ArrayBuffer | Uint8Array |  | optional A glTF JSON object, or a binary glTF buffer.
`basePath` | Resource | String | `''` | optional The base path that paths in the glTF JSON are relative to.
`show` | Boolean | `true` | optional Determines if the model primitive will be shown.
`modelMatrix` | Matrix4 | `Matrix4.IDENTITY` | optional The 4x4 transformation matrix that transforms the model from model to world coordinates.
`scale` | Number | `1.0` | optional A uniform scale applied to this model.
`minimumPixelSize` | Number | `0.0` | optional The approximate minimum pixel size of the model regardless of zoom.
`maximumScale` | Number |  | optional The maximum scale size of a model. An upper limit for minimumPixelSize.
`id` | Object |  | optional A user-defined object to return when the model is picked with `Scene#pick`.
`allowPicking` | Boolean | `true` | optional When `true`, each glTF mesh and primitive is pickable with `Scene#pick`.
`incrementallyLoadTextures` | Boolean | `true` | optional Determine if textures may continue to stream in after the model is loaded.
`asynchronous` | Boolean | `true` | optional Determines if model WebGL resource creation will be spread out over several frames or block until completion once all glTF files are loaded.
`clampAnimations` | Boolean | `true` | optional Determines if the model's animations should hold a pose over frames where no keyframes are specified.
`shadows` | ShadowMode | `ShadowMode.ENABLED` | optional Determines whether the model casts or receives shadows from each light source.
`debugShowBoundingVolume` | Boolean | `false` | optional For debugging only. Draws the bounding sphere for each draw command in the model.
`debugWireframe` | Boolean | `false` | optional For debugging only. Draws the model in wireframe.
`heightReference` | HeightReference |  | optional Determines how the model is drawn relative to terrain.
`scene` | Scene |  | optional Must be passed in for models that use the height reference property.
`distanceDisplayCondition` | DistanceDisplayCondition |  | optional The condition specifying at what distance from the camera that this model will be displayed.
`color` | Color | `Color.WHITE` | optional A color that blends with the model's rendered color.
`colorBlendMode` | ColorBlendMode | `ColorBlendMode.HIGHLIGHT` | optional Defines how the color blends with the model.
`colorBlendAmount` | Number | `0.5` | optional Value used to determine the color strength when the `colorBlendMode` is `MIX`. A value of 0.0 results in the model's rendered color while a value of 1.0 results in a solid color, with any value in-between resulting in a mix of the two.
`silhouetteColor` | Color | `Color.RED` | optional The silhouette color. If more than 256 models have silhouettes enabled, there is a small chance that overlapping models will have minor artifacts.
`silhouetteSize` | Number | `0.0` | optional The size of the silhouette in pixels.
`clippingPlanes` | ClippingPlaneCollection |  | optional The `ClippingPlaneCollection` used to selectively disable rendering the model.
`dequantizeInShader` | Boolean | `true` | optional Determines if a Draco encoded model is dequantized on the GPU. This decreases total memory usage for encoded models.
`imageBasedLightingFactor` | Cartesian2 | `Cartesian2(1.0, 1.0)` | optional Scales diffuse and specular image-based lighting from the earth, sky, atmosphere and star skybox.
`lightColor` | Cartesian3 |  | optional The color and intensity of the sunlight used to shade the model.
`luminanceAtZenith` | Number | `0.5` | optional The sun's luminance at the zenith in kilo candela per meter squared to use for this model's procedural environment map.
`sphericalHarmonicCoefficients` | Array.<Cartesian3> |  | optional The third order spherical harmonic coefficients used for the diffuse color of image-based lighting.
`specularEnvironmentMaps` | String |  | optional A URL to a KTX file that contains a cube map of the specular lighting and the convoluted specular mipmaps.

##### Demo:

- Cesium Sandcastle Models Demo

##### See:

- Model.fromGltf

### Members

#### activeAnimations : ModelAnimationCollection
Scene/Model.js 565

The currently playing glTF animations.

#### readonlyallowPicking : Boolean
Scene/Model.js 984

When `true`, each glTF mesh and primitive is pickable with `Scene#pick`. When `false`, GPU memory is saved.

Default Value: `true`

#### readonlyasynchronous : Boolean
Scene/Model.js 968

Determines if model WebGL resource creation will be spread out over several frames or block until completion once all glTF files are loaded.

Default Value: `true`

#### readonlybasePath : String
Scene/Model.js 858

The base path that paths in the glTF JSON are relative to. The base path is the same path as the path containing the .gltf file minus the .gltf file, when binary, image, and shader files are in the same directory as the .gltf. When this is `''`, the app's base path is used.

Default Value: `''`

#### readonlyboundingSphere : BoundingSphere
Scene/Model.js 881

The model's bounding sphere in its local coordinate system. This does not take into account glTF animations and skins nor does it take into account `Model#minimumPixelSize`.

Default Value: `undefined`

##### Example:

    // Center in WGS84 coordinates
    var center = Cesium.Matrix4.multiplyByPoint(model.modelMatrix, model.boundingSphere.center, new Cesium.Cartesian3());

#### clampAnimations : Boolean
Scene/Model.js 572

Determines if the model's animations should hold a pose over frames where no keyframes are specified.

#### clippingPlanes : ClippingPlaneCollection
Scene/Model.js 1176

The `ClippingPlaneCollection` used to selectively disable rendering the model.

#### color : Color
Scene/Model.js 595

A color that blends with the model's rendered color.

Default Value: `Color.WHITE`

#### colorBlendAmount : Number
Scene/Model.js 617

Value used to determine the color strength when the `colorBlendMode` is `MIX`. A value of 0.0 results in the model's rendered color while a value of 1.0 results in a solid color, with any value in-between resulting in a mix of the two.

Default Value: `0.5`

#### colorBlendMode : ColorBlendMode
Scene/Model.js 606

Defines how the color blends with the model.

Default Value: `ColorBlendMode.HIGHLIGHT`

#### debugShowBoundingVolume : Boolean
Scene/Model.js 641

This property is for debugging only; it is not for production use nor is it optimized.

Draws the bounding sphere for each draw command in the model. A glTF primitive corresponds to one draw command. A glTF mesh has an array of primitives, often of length one.

Default Value: `false`

#### debugWireframe : Boolean
Scene/Model.js 654

This property is for debugging only; it is not for production use nor is it optimized.

Draws the model in wireframe.

Default Value: `false`

#### distanceDisplayCondition : DistanceDisplayCondition
Scene/Model.js 1042

Gets or sets the condition specifying at what distance from the camera that this model will be displayed.

Default Value: `undefined`

#### readonlygltf : Object
Scene/Model.js 793

The object for the glTF JSON, including properties with default values omitted from the JSON provided to this model.

Default Value: `undefined`

#### heightReference : HeightReference
Scene/Model.js 537

Returns the height reference of the model

Default Value: `HeightReference.NONE`

#### id : Object
Scene/Model.js 527

User-defined object returned when the model is picked.

Default Value: `undefined`

##### See:

- Scene#pick

#### imageBasedLightingFactor : Cartesian2
Scene/Model.js 1207

Cesium adds lighting from the earth, sky, atmosphere, and star skybox. This cartesian is used to scale the final diffuse and specular lighting contribution from those sources to the final color. A value of 0.0 will disable those light sources.

Default Value: `Cartesian2(1.0, 1.0)`

#### readonlyincrementallyLoadTextures : Boolean
Scene/Model.js 1000

Determine if textures may continue to stream in after the model is loaded.

Default Value: `true`

#### lightColor : Cartesian3
Scene/Model.js 1243

The color and intensity of the sunlight used to shade the model.

For example, disabling additional light sources by setting `model.imageBasedLightingFactor = new Cesium.Cartesian2(0.0, 0.0)` will make the model much darker. Here, increasing the intensity of the light source will make the model brighter.

Default Value: `undefined`

#### luminanceAtZenith : Number
Scene/Model.js 1267

The sun's luminance at the zenith in kilo candela per meter squared to use for this model's procedural environment map. This is used when `Model#specularEnvironmentMaps` and `Model#sphericalHarmonicCoefficients` are not defined.

Default Value: `0.5`

##### Demo:

- Sandcastle Image Based Lighting Demo

#### maximumScale : Number
Scene/Model.js 515

The maximum scale size for a model. This can be used to give an upper limit to the `Model#minimumPixelSize`, ensuring that the model is never an unreasonable scale.

#### minimumPixelSize : Number
Scene/Model.js 505

The approximate minimum pixel size of the model regardless of zoom. This can be used to ensure that a model is visible even when the viewer zooms out. When `0.0`, no minimum size is enforced.

Default Value: `0.0`

#### modelMatrix : Matrix4
Scene/Model.js 480

The 4x4 transformation matrix that transforms the model from model to world coordinates. When this is the identity matrix, the model is drawn in world coordinates, i.e., Earth's WGS84 coordinates. Local reference frames can be used by providing a different transformation matrix, like that returned by `Transforms.eastNorthUpToFixedFrame`.

Default Value: ``Matrix4.IDENTITY``

##### Example:

    var origin = Cesium.Cartesian3.fromDegrees(-95.0, 40.0, 200000.0);
    m.modelMatrix = Cesium.Transforms.eastNorthUpToFixedFrame(origin);

#### readonlypendingTextureLoads : Number
Scene/Model.js 1014

Return the number of pending texture loads.

#### readonlyready : Boolean
Scene/Model.js 922

When `true`, this model is ready to render, i.e., the external binary, image, and shader files were downloaded and the WebGL resources were created. This is set to `true` right before `Model#readyPromise` is resolved.

Default Value: `false`

#### readonlyreadyPromise : Promise.<Model>
Scene/Model.js 951

Gets the promise that will be resolved when this model is ready to render, i.e., when the external binary, image, and shader files were downloaded and the WebGL resources were created.

This promise is resolved at the end of the frame before the first frame the model is rendered in.

##### Example:

    // Play all animations at half-speed when the model is ready to render
    Cesium.when(model.readyPromise).then(function(model) {
      model.activeAnimations.addAll({
        multiplier : 0.5
      });
    }).otherwise(function(error){
      window.alert(error);
    });

##### See:

- Model#ready

#### scale : Number
Scene/Model.js 493

A uniform scale applied to this model before the `Model#modelMatrix`. Values greater than `1.0` increase the size of the model; values less than `1.0` decrease.

Default Value: `1.0`

#### shadows : ShadowMode
Scene/Model.js 585

Determines whether the model casts or receives shadows from each light source.

Default Value: `ShadowMode.ENABLED`

#### show : Boolean
Scene/Model.js 443

Determines if the model primitive will be shown.

Default Value: `true`

#### silhouetteColor : Color
Scene/Model.js 452

The silhouette color.

Default Value: `Color.RED`

#### silhouetteSize : Number
Scene/Model.js 464

The size of the silhouette in pixels.

Default Value: `0.0`

#### specularEnvironmentMaps : String
Scene/Model.js 1325

A URL to a KTX file that contains a cube map of the specular lighting and the convoluted specular mipmaps.

##### Demo:

- Sandcastle Image Based Lighting Demo

##### See:

- Model#sphericalHarmonicCoefficients

#### sphericalHarmonicCoefficients : Array.<Cartesian3>
Scene/Model.js 1299

The third order spherical harmonic coefficients used for the diffuse color of image-based lighting. When `undefined`, a diffuse irradiance computed from the atmosphere color is used.

There are nine `Cartesian3` coefficients. The order of the coefficients is: L00, L1-1, L10, L11, L2-2, L2-1, L20, L21, L22

These values can be obtained by preprocessing the environment map using the `cmgen` tool of Google's Filament project. This will also generate a KTX file that can be supplied to `Model#specularEnvironmentMaps`.

##### Demo:

- Sandcastle Image Based Lighting Demo

##### See:

- An Efficient Representation for Irradiance Environment Maps

### Methods

#### staticCesium.Model.fromGltf(options) → Model
Scene/Model.js 1461

Creates a model from a glTF asset. When the model is ready to render, i.e., when the external binary, image, and shader files are downloaded and the WebGL resources are created, the `Model#readyPromise` is resolved.

The model can be a traditional glTF asset with a .gltf extension or a Binary glTF using the .glb extension.

Cesium supports glTF assets with the following extensions:

- KHR_binary_glTF (glTF 1.0)
- KHR_materials_common (glTF 1.0)
- WEB3D_quantized_attributes (glTF 1.0)
- AGI_articulations
- KHR_blend (draft)
- KHR_draco_mesh_compression
- KHR_materials_pbrSpecularGlossiness
- KHR_materials_unlit
- KHR_techniques_webgl
- KHR_texture_transform

For high-precision rendering, Cesium supports the CESIUM_RTC extension, which introduces the CESIUM_RTC_MODELVIEW parameter semantic that says the node is in WGS84 coordinates translated relative to a local origin.

Name | Type | Description
--- | --- | ---

`options`

Object

Object with the following properties:

Name | Type | Default | Description
--- | --- | --- | ---
`url` | Resource | String |  | The url to the .gltf file.
`basePath` | Resource | String |  | optional The base path that paths in the glTF JSON are relative to.
`show` | Boolean | `true` | optional Determines if the model primitive will be shown.
`modelMatrix` | Matrix4 | `Matrix4.IDENTITY` | optional The 4x4 transformation matrix that transforms the model from model to world coordinates.
`scale` | Number | `1.0` | optional A uniform scale applied to this model.
`minimumPixelSize` | Number | `0.0` | optional The approximate minimum pixel size of the model regardless of zoom.
`maximumScale` | Number |  | optional The maximum scale for the model.
`id` | Object |  | optional A user-defined object to return when the model is picked with `Scene#pick`.
`allowPicking` | Boolean | `true` | optional When `true`, each glTF mesh and primitive is pickable with `Scene#pick`.
`incrementallyLoadTextures` | Boolean | `true` | optional Determine if textures may continue to stream in after the model is loaded.
`asynchronous` | Boolean | `true` | optional Determines if model WebGL resource creation will be spread out over several frames or block until completion once all glTF files are loaded.
`clampAnimations` | Boolean | `true` | optional Determines if the model's animations should hold a pose over frames where no keyframes are specified.
`shadows` | ShadowMode | `ShadowMode.ENABLED` | optional Determines whether the model casts or receives shadows from each light source.
`debugShowBoundingVolume` | Boolean | `false` | optional For debugging only. Draws the bounding sphere for each `DrawCommand` in the model.
`debugWireframe` | Boolean | `false` | optional For debugging only. Draws the model in wireframe.
`heightReference` | HeightReference |  | optional Determines how the model is drawn relative to terrain.
`scene` | Scene |  | optional Must be passed in for models that use the height reference property.
`distanceDisplayCondition` | DistanceDisplayCondition |  | optional The condition specifying at what distance from the camera that this model will be displayed.
`color` | Color | `Color.WHITE` | optional A color that blends with the model's rendered color.
`colorBlendMode` | ColorBlendMode | `ColorBlendMode.HIGHLIGHT` | optional Defines how the color blends with the model.
`colorBlendAmount` | Number | `0.5` | optional Value used to determine the color strength when the `colorBlendMode` is `MIX`. A value of 0.0 results in the model's rendered color while a value of 1.0 results in a solid color, with any value in-between resulting in a mix of the two.
`silhouetteColor` | Color | `Color.RED` | optional The silhouette color. If more than 256 models have silhouettes enabled, there is a small chance that overlapping models will have minor artifacts.
`silhouetteSize` | Number | `0.0` | optional The size of the silhouette in pixels.
`clippingPlanes` | ClippingPlaneCollection |  | optional The `ClippingPlaneCollection` used to selectively disable rendering the model.
`dequantizeInShader` | Boolean | `true` | optional Determines if a Draco encoded model is dequantized on the GPU. This decreases total memory usage for encoded models.

##### Returns:

The newly created model.

##### Examples:

    // Example 1. Create a model from a glTF asset
    var model = scene.primitives.add(Cesium.Model.fromGltf({
      url : './duck/duck.gltf'
    }));

    // Example 2. Create model and provide all properties and events
    var origin = Cesium.Cartesian3.fromDegrees(-95.0, 40.0, 200000.0);
    var modelMatrix = Cesium.Transforms.eastNorthUpToFixedFrame(origin);

    var model = scene.primitives.add(Cesium.Model.fromGltf({
      url : './duck/duck.gltf',
      show : true,                     // default
      modelMatrix : modelMatrix,
      scale : 2.0,                     // double size
      minimumPixelSize : 128,          // never smaller than 128 pixels
      maximumScale: 20000,             // never larger than 20000 * model size (overrides minimumPixelSize)
      allowPicking : false,            // not pickable
      debugShowBoundingVolume : false, // default
      debugWireframe : false
    }));

    model.readyPromise.then(function(model) {
      // Play all animations when the model is ready to render
      model.activeAnimations.addAll();
    });

#### staticCesium.Model.silhouetteSupported(scene) → Boolean
Scene/Model.js 1355

Determines if silhouettes are supported.

Name | Type | Description
--- | --- | ---
`scene` | Scene | The scene.

##### Returns:

`true` if silhouettes are supported; otherwise, returns `false`

#### applyArticulations()
Scene/Model.js 1717

Applies any modified articulation stages to the matrix of each node that participates in any articulation. Note that this will overwrite any nodeTransformations on participating nodes.

##### Throws:

- DeveloperError : The model is not loaded. Use Model.readyPromise or wait for Model.ready to be true.

#### destroy()
Scene/Model.js 5180

Destroys the WebGL resources held by this object. Destroying an object allows for deterministic release of WebGL resources, instead of relying on the garbage collector to destroy this object.
Once an object is destroyed, it should not be used; calling any function other than `isDestroyed` will result in a `DeveloperError` exception. Therefore, assign the return value (`undefined`) to the object as done in the example.

##### Throws:

- DeveloperError : This object was destroyed, i.e., destroy() was called.

##### Example:

    model = model && model.destroy();

##### See:

- Model#isDestroyed

#### getMaterial(name) → ModelMaterial
Scene/Model.js 1596

Returns the glTF material with the given `name` property.

Name | Type | Description
--- | --- | ---
`name` | String | The glTF name of the material.

##### Returns:

The material or `undefined` if no material with `name` exists.

##### Throws:

- DeveloperError : The model is not loaded. Use Model.readyPromise or wait for Model.ready to be true.

#### getMesh(name) → ModelMesh
Scene/Model.js 1584

Returns the glTF mesh with the given `name` property.

Name | Type | Description
--- | --- | ---
`name` | String | The glTF name of the mesh.

##### Returns:

The mesh or `undefined` if no mesh with `name` exists.

##### Throws:

- DeveloperError : The model is not loaded. Use Model.readyPromise or wait for Model.ready to be true.

#### getNode(name) → ModelNode
Scene/Model.js 1570

Returns the glTF node with the given `name` property. This is used to modify a node's transform for animation outside of glTF animations.

Name | Type | Description
--- | --- | ---
`name` | String | The glTF name of the node.

##### Returns:

The node or `undefined` if no node with `name` exists.

##### Throws:

- DeveloperError : The model is not loaded. Use Model.readyPromise or wait for Model.ready to be true.

##### Example:

    // Apply non-uniform scale to node LOD3sp
    var node = model.getNode('LOD3sp');
    node.matrix = Cesium.Matrix4.fromScale(new Cesium.Cartesian3(5.0, 1.0, 1.0), node.matrix);

#### isDestroyed() → Boolean
Scene/Model.js 5160

Returns true if this object was destroyed; otherwise, false.
If this object was destroyed, it should not be used; calling any function other than `isDestroyed` will result in a `DeveloperError` exception.

##### Returns:

`true` if this object was destroyed; otherwise, `false`.

##### See:

- Model#destroy

#### setArticulationStage(articulationStageKey, value)
Scene/Model.js 1611

Sets the current value of an articulation stage. After setting one or multiple stage values, call Model.applyArticulations() to cause the node matrices to be recalculated.

Name | Type | Description
--- | --- | ---
`articulationStageKey` | String | The name of the articulation, a space, and the name of the stage.
`value` | Number | The numeric value of this stage of the articulation.

##### Throws:

- DeveloperError : The model is not loaded. Use Model.readyPromise or wait for Model.ready to be true.

##### See:

- Model#applyArticulations

#### update()
Scene/Model.js 4643

Called when `Viewer` or `CesiumWidget` render the scene to get the draw commands needed to render this primitive.

Do not call this function directly. This is documented just to list the exceptions that may be propagated when the scene is rendered:

##### Throws:

- RuntimeError : Failed to load external reference.