selecting surface points

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Permalink Reply by Danny Boyes on March 11, 2011 at 5:58am

Is this the same thing?

http://www.grasshopper3d.com/forum/topics/surfacedivide-points-with...

Permalink Reply by Vishal Sawlani on March 11, 2011 at 6:22am

thanks a million...wrks perfect....bt 

on the R output of the containment component it says :

 

Point/Region Relationship (0=coincident; 1= inside ; 2= outside)..

 

i do not understand that how to switch between 0, 1 and 2...i cant find the "Set integer " menu...

Permalink Reply by Danny Boyes on March 11, 2011 at 7:04am

If a point is inside the boundary curve the output is 1. If the point lies on the boundary curve it is 0 and for all the points outside of the closed curve the output is 2. Therefore in this case you get a boolean pattern of 0's and 1's for the cull pattern component. If however you wanted to select a bunch of points in grid with a curve then you would get 2's and 1's with a possibility of 0's. In this case you need to manipulate the output to get a culling pattern. I usually do this by subtracting 1 from the output to get -1's (coincident) 0's (inside) and 1's (outside) and Inverting the pattern input. This gives you inside only, If you want both coincident and inside then I use an Fx component with the expression floor(x/2) and then inverted.