MeshJointInfluence

struct · iOS 18.0+ · SDK 27.1

struct MeshJointInfluence

A binding to a joint, which consists of the joint's index and the weight of that joint's influence on a vertex. A vertex may be influenced by one or more joints. The skinned position of that vertex is defined by a set of MeshJointInfluence values whose weights sum to 1. The skinned position is given by: ```swift position = vertexPosition(transformedByJoint: influences[0].jointIndex) * influences[0].weight + vertexPosition(transformedByJoint: influences[1].jointIndex) * influences[1].weight + ... ``` The skinned position of a vertex is a linear combination of the vertex's position transformed by each joint, with weights given by the MeshJointInfluence values. To transform a vertex position by a joint, the initial vertex position is first transformed by the joint's inverse bind pose matrix, then by the local-to-parent transform of the joint, and finally by the local-to-parent transform of each of the joint's parents.

Members (6)

static initJointIndexWeight(jointIndex: number, weight: number): MeshJointInfluence

init(jointIndex: Int, weight: Float)

get jointIndex(): number

var jointIndex: Int { get set }

set jointIndex(value: number)

var jointIndex: Int { get set }

get weight(): number

var weight: Float { get set }

set weight(value: number)

var weight: Float { get set }

static init(): MeshJointInfluence

init()

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