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Nov 01, 2021 2:57 am
Hi guys,
I an amateur in maxscript, trying to write a script to make traffic cars using path constraint.
the script does 2 things. make all selected cars orientation “follow” the path, and randomize the car’s position by “percentage”. This is what I have :
arr = selection as array
lastpos = 0
for i in (arr) do
(
i.pos.controller.Path_Constraint.controller.follow = on
i.pos.controller.Path_Constraint.controller.percent = lastpos + (random 0.5 3)
lastpos = i.pos.controller.Path_Constraint.controller.percent
)
But there is a problem. the cars are in 7 colors but there is hundreds copy of them. my script makes a lot of the same color cars in a row. I think it is because of the selection array order. So I am looking for a way to randomize the selection array before doing the job.
Please help. Thanks.
3 Replies
Nov 01, 2021 2:57 am
fn shuffleIndexes count seedvalue: =
(
if seedvalue != unsupplied do seed seedvalue
list = #()
list.count = count
for k = 1 to count do
(
i = random 1 k
list[k] = list[i]
list[i] = k
)
list
)
arr = selection as array
shuffled_arr = for k in (shuffleIndexes arr.count seedvalue:1) collect arr[k]As far as I remember, the first person to show this MXS shuffle implementation was the biddle … so that’s his credit.
Nov 01, 2021 2:57 am
slight variation
(
fn random_shuffle arr seeding: =
(
if seeding != unsupplied do seed seeding;
for i = 1 to arr.count - 1 do
(
j = random (i+1) arr.count;
swap arr[i] arr[j];
)
)
arr = selection as array
random_shuffle arr
arr
)
or
fn random_shuffle arr seeding: =
(
if seeding != unsupplied do seed seeding;
for i = 1 to arr.count do
(
j = random 1 arr.count;
swap arr[i] arr[j];
)
)Nov 01, 2021 2:57 am
It works perfectly. Thank a lot KLVNK and denisT.