Activates the interpolation of render hairs between guide curves that have been previously split or shattered.
When guide curves are merged, an asterisk is displayed next to the interpolation group ID when Hair Interpolation Group IDs is on in the Objects.
To apply: Select at least one point on each of the guide curves you want to merge, and then choose Modify 
Interp Merge from the Hair panel.
To display: Select the hair object, click the Selection button on the Select panel, and then click the Hair Merge Operator icon.
For more information, see Working with Groups of Guide Hairs [ Hair ].
