Hi guys,
I’m new to grasshopper and I’m doing a kind of project analysis. I tried myself to create a box (building volume) which has a constant number of sqm doenst matter the change of lenghth, width, either height. But probably my knowledge about grasshopper is not deep enough that’s why I come here for help and I really appreciate.
Thanks in advance !!! 
Have a nice weekend 
Welcome
Is it surface (m²) or volume ?
Do you want slider for all the values ? If so yes it could be difficult !
Parametric tool needs parameters and algorithm (area = length * width )
It could be more simple to define a ratio (length/width) for example going from 0.01 to 100 for example and a slider for area from 1 m² to 100000 m² and that’s all !!
Two problems:
Hi Laurent, it would be surface and height should be constaint within 3 number 4.5 , 9 and 13,5. I tried to look in grasshopper toolbar to find any thing like x belongs to (4.5,9,13.5) like I always do in math but couldnt find it.
But thank you very much for your reply
Thanks Joseph 
Aha! New constraints on the problem. Any others we should know about?
Wait a second… Height is irrelevant to surface area of the “ground floor”. This problem is getting more obscure, not less. And a now “block size”? I give up, sorry.
haha! that’s it and the block size is 4000 sqm which has to remain the same
