Animation Nodes : Use Previous output of a Loop in calculation of the next iteration

Question

What i am trying to achieve :

• Random floating floors (square plane)
• floating stairs connecting to each of them (Line generator with steps)
• all floating floors have another floor which is parallel to it so the stairs are straight and only going up or down

What i have achieved so far

• Object instances get vertical elevation from index of loop
• Random number to either or X or Y axis by using boolean switch

The problem :

all the planes are shifted from origin rather than using the location of the previous plane as starting point

So, is there a a way for the loop to get the location of the previous plane and offset the next plane in X or Y ?

For the stairs I'm planning to use line generator in start/end/step mode in loop to generate locations for the stair instances

Answer 1

You can do this by using 'reassign'.

This is an option accessible from the 'loop subprogram' and which allow to obtain a node from which you can reassign an input parameter from some calculated result inside the subprogram.

• Select the subprogram.
• Go into the properties on the right, in the node tab, then click 'reassign' for the input you want.
• That generates a reassign node, place it in the grid.

Now you can connect its input from the calculation you want (here probably the loop result).