Instead of adding each individual object as an Object3D derived entity to the three.js scene, we split and organize them into batches, which are then added to the three.js scene. The Batch is defined as an interface, and is implemented by several batch types based on the geometry type.

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Properties

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batchMaterial

batchMaterial: Material;
The batch’s default material. Batch objects have been grouped by this material. Returns: Material

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geometryType

geometryType: GeometryType;
The batch’s GeometryType. Returns: GeometryType

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id

id: string;
The UUID of the batch. Follows three.js uuid format. Returns: string

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renderObject

renderObject: Object3D;
The batch’s renderable object. Depending on the batch type, this can be either a Mesh, LineSegment2, Points, Text. Returns: Object3D

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renderViews

renderViews: NodeRenderView[]
The collection of render views that make up the batch. Returns: NodeRenderView[]

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subtreeId

subtreeId: number;
The id of the subtree the batch is part of. Returns: number

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Accessors

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bounds

get bounds(): Box3
Gets the bounds of the batch. Returns: Box3

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drawCalls

get drawCalls(): number
Gets the current of draw calls for the batch. Returns: number

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groups

get groups(): DrawGroup[]
Gets the current list of draw groups. A draw group is equivalent to a draw call. Returns: DrawGroup[]

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materials

get materials(): Material[]
Gets the current list of materials used for rendering the batch. Returns: Material[]

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minDrawCalls

get minDrawCalls(): number
Gets the implementation’s desired minimum draw calls. Ideally 1, but implementation dependant. Returns: number

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triCount

get triCount(): number
Gets the batch’s triangle count. Returns: number

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vertCount

get vertCount(): number
Gets the batch’s vertex count. Returns: number

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Methods

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buildBatch

buildBatch();
Build this batch. The implementation needs to make the batch renderable by:
  • Building the geometry
  • Creating appropriate [BatchObjects](if any) and their acceleration structures(if any)
  • Setting appropriate batch data to the render views
  • Initialising the batch’s renderObject
Returns: void

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getCount

getCount(): number
Gets the batch’s primitive count Returns: void

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getDepth

getDepth(): BatchUpdateRange
Gets the batch’s BatchUpdateRange required for the depth pass. Returns: BatchUpdateRange

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getMaterial

getMaterial(renderView: NodeRenderView): Material
Gets the current material of the provided render view. Parameters Returns: Material

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getMaterialAtIndex

getMaterialAtIndex(index: number): Material
Gets the current material of the provided primitive index. Batches that build acceleration structures do not need to implement this. Parameters
  • index: The primitive index to lookup
Returns: Material

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getOpaque

getOpaque(): BatchUpdateRange
Gets the batch’s opaque BatchUpdateRange. Returns: BatchUpdateRange

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getRenderView

getRenderView(index: number): NodeRenderView
Gets the render view at the specified index. Batches that build acceleration structures do not need to implement this. Parameters
  • index: The primitive index to lookup
Returns: NodeRenderView

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getStencil

getStencil(): BatchUpdateRange
Gets the batch’s stencil BatchUpdateRange. Returns: BatchUpdateRange

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getTransparent

getTransparent(): BatchUpdateRange
Gets the batch’s transparent BatchUpdateRange. Returns: BatchUpdateRange

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getVisibleRange

getVisibleRange(): BatchUpdateRange
Gets the batch’s visible BatchUpdateRange. Returns: [BatchUpdateRange](/developers/viewer/batch-api#batchupd

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onRender

onRender(renderer: WebGLRenderer): void
Callback for the viewer’s render loop. Parameters Returns: void

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onUpdate

onUpdate(deltaTime: number): void
Callback for the viewer’s update loop. Parameters
  • deltaTime: number
Returns: void

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purge

purge(): void
Purges the batch by disposing of the associated geometry data and materials. Returns: void

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resetDrawRanges

resetDrawRanges: void
Resets the batch to its default state where there is a single draw group rendered with the batchMaterial. Returns: void

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setBatchBuffers

setBatchBuffers(range: BatchUpdateRange[]): void
Updates relevant batch buffers based on the MaterialOptions from the provided BatchUpdateRange. Implementation specific. Parameters Returns: void

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setBatchMaterial

setBatchMaterial(material: Material): void
Sets the default batch material. Parameters Returns: void

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setDrawRanges

setDrawRanges(ranges: BatchUpdateRange[]): void
Sets materials to specific objects inside the batch by specifying their draw ranges.
Materials are assigned to objects inside batches by using this method. Normally, the viewer offers a higher level of assigning materials through SpeckleRenderer’s setMaterial which calls this method internally.
Parameters Returns: void

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setVisibleRange

setVisibleRange(range: BatchUpdateRange[]): void
Sets visibility of objects inside the batch. Implementation specific.
Mesh batches currently only allow for contiguous visibility between draw ranges. i.e no different visibility gaps. Line batches however are not restricted by this.
Parameters Returns: void

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Typedefs

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BatchUpdateRange

interface BatchUpdateRange {
  offset: number;
  count: number;
  material?: Material;
  materialOptions?: FilterMaterialOptions;
}
Represents a region of the batch. Multi purpose. It can represent either a specific object from the batch, or a specific index range in the batch spanning across multiple objects.

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DrawGroup

interface DrawGroup {
  start: number;
  count: number;
  materialIndex?: number;
}
Formalisation of three.js’s notion of draw group.
The viewer’s MeshBatch implementation of Batch uses three.js’s geometry groups as a means to render parts of the batch with different materials.

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LineBatch

class LineBatch implements Batch {}
Batch implementation for lines.

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MeshBatch

class MeshBatch implements Batch {}
Batch implementation for triangle meshes.

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InstancedMeshBatch

class InstancedMeshBatch implements Batch {}
Batch implementation for instances of triangle meshes with hardware instancing support.

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PointBatch

class PointBatch implements Batch {}
Batch implementation for points and point clouds.

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TextBatch

class TextBatch implements Batch {}
Batch implementation for text. Using troika-three-text internally.