Exclude certain hair particles from face instancing

Question

I want to relocate faces of a mesh to the spline's points, which are extracted from hair particles. Face should be placed only at the end of spline, except some strands, where I want to have another face in the middle.

For this I made a loop to apply mask to extracted points:

• Red outline - specific strands with 2 faces (defined by index)
• Green outline - compare logic

Problem is that I need to specify more strands (from bigger project), and don't want to replicate outlined parts of nodetree for each strand. Like excluding of 300 strands means 300 inputs. There should be more optimized way to do it

Answer 1

You can use a boolean list as an iterator to switch between a list with only the end point and a list with a center point appended:

Of course you can also define the condition by the index of the spline. To do so, you can generate the boolean list as follows:

You start with a boolean list of Trues and turn the elements at the input indices to Falses. The parameter boolean list should be reassigned and used as an output.

Answer 2

Using "Expression node" in Omar's answer helped me a lot (haven't used it before). But ended up with this tree:

Expression node in Left-bottom corner is a list of specific particles (just a line without many inputs). Next Expression nodes compare Initial ID list with Specific and turns every ID to 0 of those particles, which are not present in Specific list.