geometryFaceRange.cmn.md

geometryFaceRange

faceRange is an inclusive range of faces in this geometry that belongs to this feature.

For each feature, faceRange indicates its first and last triangles as a pair of integer indices in the face list.

Notes:

• featureID attribute is required
• This attributes is only supported when topology is triangle
• Vertices in the geometry buffer must be grouped by feature_id
• for un-indexed triangle meshes, vertex_index = face_index * 3

Example

Mesh with 2 features.

Grouped vertices in the geometry buffer.

Related:

cmn::geometryBuffer

Properties

Property	Type	Description
type	string	Data type for the index range Must be: UInt32
component	integer	Pair of indices marking first and last triangles for a feature.
encoding	string	Must be: none
binding	string	Must be: per-feature

Note: properties in bold are required

Examples

Example: FaceRange

 {
  "type": "UInt32",
  "component": 2
}