Forum topic · General Scripting
By HP6830s · 2012-03-13
Hi!
I want to loop over all faces and collect those who have same normal into an array then append this one to an other array..
for exemple in the image I shawn it is a simple cube as you see face 1,2,3,4 have same normal 5,6,7,8 have same normal...Iwant to obtain 2D array like this...
((1,2,3,4),(5,6,7,8)....)
I couldn' fin a good algo to do this...since the face normal is unknow...before loop...especilally on a complex object...that have a lot of differents normals, any Ideas how to do this?
Swordslayer · 2012-03-15
I would use this method - i.e. collect string addresses of face normals as you go (or maybe names instead of strings, pick one). When that address already exists, use the corresponding subarray (although I'd suggest using bitarrays here), if not, store the address and a new subarray.
(
local decimalPrecision = 3 -- change this value to your liking
local formatString = "1." + decimalPrecision as string + "f"
local obj = selection[1]
local faces = obj.faces as bitArray
local normalAddresses = #()
local normalFaces = #()
local getPolyNormal = polyop.getFaceNormal
fn getAddress normal =
(
formattedPrint normal.x format:formatString + "|" +
formattedPrint normal.y format:formatString + "|" +
formattedPrint normal.z format:formatString
)
for face in faces do
(
local normalAddress = getAddress (normalize (getPolyNormal obj face))
if (local index = findItem normalAddresses normalAddress) > 0 then
append normalFaces[index] face
else
(
append normalAddresses normalAddress
append normalFaces #(face)
)
)
normalFaces
)