meshUtils

Method Overview

Method Details

createElevationSampler(mesh, options){Promise<ElevationSampler>}

Since: ArcGIS Maps SDK for JavaScript 4.12

Creates an elevation sampler from a mesh. The sampler can be used to query elevation values on the surface of the mesh. The elevation sampler uses a snapshot of the Mesh geometry and will not update if the mesh changes after the sampler has been created.

Parameters

mesh Mesh The mesh geometry used to create the elevation sampler.

options Object optional Additional options. Specification noDataValue Number optional Default Value: 0 The value to use when there is no data available.

Returns

Type	Description
Promise<ElevationSampler>	An elevation sampler.

See also

• Sample - Low poly terrain using mesh geometry

createFromElevation(source, extent, options){Promise<Mesh>}

Creates a mesh geometry by sampling elevation data from an elevation service on a regular grid.

Parameters

source ElevationLayer|Ground|ElevationSampler The source from which to query the elevation data.

extent Extent The extent from which to create the mesh.

options Object optional Additional options.

params.material MeshMaterial optional The material to be used for the mesh.

options.demResolution Number|String optional Default Value: auto Controls the horizontal resolution (cell size) in meters from which elevation data is sampled (defaults to auto). See ElevationLayer.queryElevation for more details on the different settings.

options.signal AbortSignal optional Signal object that can be used to abort the asynchronous task.

Returns

Type	Description
Promise<Mesh>	A promise that resolves to a mesh geometry representing the elevation data at the specified extent.

Example

// Create a mesh by sampling the ground
meshUtils.createFromElevation(map.ground, extent)
    .then(function(mesh) {
      // Do something with the mesh
    });

// Create a mesh by sampling the ground surface currently in view
meshUtils.createFromElevation(view.groundView.elevationSampler, view.extent)
    .then(function(mesh) {
      // Do something with the mesh
    });

georeference(vertexAttributes, location, options){VertexAttributes}

Georeferences vertices specified in a Cartesian coordinate system. This is useful when converting general 3D model meshes not typically georeferenced. This method operates on mesh vertex attributes and will convert positions and normals (if specified) from a local (0, 0, 0) Cartesian system to the properly georeferenced coordinates at the specified location. The unit of the source data defaults to the unit of the location's spatial reference. If the coordinate system is WGS84, metric units are used as the default. The unit of the source data may be specified in the additional options in which case a linear unit scale will automatically be applied to bring the source data in the unit of the spatial reference.

Parameters

Specification

vertexAttributes VertexAttributes The position and normal buffers to georeference.

location Point The location at which to georeference the position and normal buffers.

options Object optional Additional options. Specification geographic Boolean optional Indicates whether to georeference relative to the globe or the projected coordinate system. unit String optional Indicates the unit of the source data. A linear scale will be applied to the position attributes to convert the source data to the unit of the spatial reference at which the mesh is being georeferenced. By default the unit of the source data is assumed to be the same as the target spatial reference. Possible Values:"millimeters"|"centimeters"|"decimeters"|"meters"|"kilometers"|"inches"|"feet"|"yards"|"miles"|"nautical-miles"|"us-feet"

Returns

Type	Description
VertexAttributes	The georeferenced position and normal buffers.

Example

let geoVertexAttributes = meshUtils.georeference(vertexAttributes, location);
let mesh = new Mesh({
  vertexAttributes: geoVertexAttributes,
  spatialReference: location.spatialReference
});

merge(geometries){Mesh}

Merges multiple meshes into a single mesh. All mesh geometries must be in the same spatial reference.

Parameter

geometries Mesh[] One or more meshes.

Returns

Type	Description
Mesh	The merged mesh geometry.

Example

let mergedMesh = meshUtils.merge([mesh1, mesh2]);

ungeoreference(vertexAttributes, location, options){VertexAttributes}

Projects georeferenced vertices to a Cartesian coordinate system. This is useful for converting existing scene geometry so that it can be used as source material for generating new 3D meshes. This method operates on mesh vertex attributes and will convert positions and normals (if specified) from georeferenced coordinates at the specified location to a local (0, 0, 0) Cartesian system. The unit of the resulting data defaults to the unit of the location's spatial reference. If the coordinate system is WGS84, metric units are used as the default. The unit of the resulting data may be specified in the additional options in which case a linear unit scale will automatically be applied.

Parameters

Specification

vertexAttributes VertexAttributes The georeferenced position and normal buffers.

location Point The location to which the position and normal buffers are georeferenced.

options Object optional Additional options. Specification geographic Boolean optional Indicates whether the coordinates are georeferenced relative to the globe or the projected coordinate system. unit String optional Indicates the unit of the resulting data. A linear scale will be applied to the position attributes to convert the source data to the specified unit. By default the unit of the resulting data will be the same as the source spatial reference. Possible Values:"millimeters"|"centimeters"|"decimeters"|"meters"|"kilometers"|"inches"|"feet"|"yards"|"miles"|"nautical-miles"|"us-feet"

Returns

Type	Description
VertexAttributes	The position and normal buffers in a local Cartesian coordinate system.

Example

let vertexAttributes = meshUtils.ungeoreference(geoVertexAttributes, location);

Type Definitions

VertexAttributes Object

Represents the position and normal vertex attribute buffers of a mesh.

Properties

position Float64Array The position buffer.

normal Float32Array optional The normal buffer.

tangent Float32Array optional The tangent buffer.