Method TrackLight

xyz/node.go:289–303

TrackLight moves node to position of light of given name. For SpotLight, copies entire Pose. Does not work for Ambient light which has no position information.

(lightName string)

// For SpotLight, copies entire Pose. Does not work for Ambient light
// which has no position information.
func (nb *NodeBase) TrackLight(lightName string) error {
	lt, ok := nb.Scene.Lights.ValueByKeyTry(lightName)
	if !ok {
		return fmt.Errorf("xyz Node: %v TrackLight named: %v not found", nb.Path(), lightName)
	}
	switch l := lt.(type) {
	case *DirLight:
		nb.Pose.Pos = l.Pos
	case *PointLight:
		nb.Pose.Pos = l.Pos
	case *SpotLight:
		nb.Pose.CopyFrom(&l.Pose)
	}
	return nil
}