API Reference > geometry-core > CartesianGeometry > Vector3d > dotProductStartEnd dotProductStartEnd Method Returns the dot product of this vector with the with vector from pointA to pointB dotProductStartEnd(pointA: XYAndZ, pointB: XYAndZ): number Parameter Type Description pointA XYAndZ start point of second vector of dot product pointB XYAndZ end point of second vector of dot product Returns - number Defined in core/geometry/src/geometry3d/Point3dVector3d.ts Line 1042 Last Updated: 13 June, 2024