Pass forward the exact number of faces after split in z/x

Question

I need some help, I thought this would be straight forward 😉

I need to know how to pass the number of the faces after a split in the z and x direction. What my end goal should be is to create a recursion that will change the split distance until the number of faces equals a value. I want a grid of 9 faces (to make the test simple) and then I will need it to calculate the split size from that information.

So in case geometry.nFaces or split.total == 9 : do something else : go back and modify the split value + 1 or so.

If I try to print what is going on I can see that if I use nFaces I will get printed 1 nine times. If I use split.total I will get 3 nine times. How can I call the actual face number sum 9? If I report on this I wil get N = 9, Sum 27, Avg = 3.

I must forget something here!

Start-->

split(x) { scope.sx / 3 : split(z) {scope.sz / 3 : splitZ(split.total) }*}*

#split(z) { scope.sz / 8 : splitZ(split.total) }*

splitZ(N)-->

#case Z == 1 : color(1,0,0) else : color(1,0,1)

#case split.total == 2 : print(true) else : print(false)

print(N)

report("Grid", N)

#case Z == 7 : color (1,0,0) else :  color (1,1,0)

Anonymous User · Answer

Do the results have to be in a grid as you show? Your grid is really just rows. There is a "noAdjust" parameter for the split operation if you need to split into a grid which lines up in both x and z directions. If the grid is not necessary, there might be other recursion options.

Anonymous User · Answer

Write a python script that changes the rule attributes and runs the rule over and over. Write the total points and attribute values into the reports for the model. Keep doing this until you get what you want. Keep changing the values and running until you get many attribute settings that get the right result. Make a fitness test for these and compare these against each other to get the best fit. You can make the first genetic solver for CE. Read here:

Evolutionary algorithm - Wikipedia, the free encyclopedia

MatthiasBuehler · Answer

Hi Kenneth

Hehe, Chris was my Padavan .. hehe.. Hope he turns to the dark side too .. 😉

There is no way in CGA to get the information of how many shapes a split will produce 'before' you actually do the split. That is a well-known limitation of CGA.

E.g. if you have a zig-zagged shape and you cut off the 'spikes', CGA cannot 'foresee' the result. You only know if once the split was actually done.

Cheers,

Matt

Matthias Buehler

Head of 3D Technologies

twitter: @MattB3D

-------------------------------------

Garsdale Design Limited

matthias.buehler@garsdaledesign.co.uk

www.garsdaledesign.co.uk