[Closed] material ID script. how to?

You can try using my simple tool from this post. There you must select maually faces in UnwrapUVW window and assingn them proper material ID via tool. This way should by enough for couple ID.
Of course it not what you exactly need, but can by helpfull partially.

but I don’t want to select manually all the uvs etc etc, I just want to select the object, run the script, done. I have a big ammount of objects that need to tweak in this way, with lots of uv’s and I don’t want to go 1 by 1 doing it by hand…

thanks for the suggestion tho!

any other ideas on how to script that ?

cheers!

)
you don’t need to do it manually. i mean find faces in a loop)
i’ll give it a try.
But how compute UVs for the face? cause some of 3 certices of a face could be in differen coords (i mean one in 0-1 range, another in 1-2 for example)
maybe face center?

I have another rule, that many times I’ve break:
First try, show your code, then ask for orientation… not for answer…

But Anyway, next test averages the uvs of faceverts and calculates the matID ‘V only’
change: gradients | chn

(
o = selection[1]
chn = 1
gradients = 10

for f = 1 to polyop.getNumMapFaces o chn collect
(
	sum = 0.0
	face = polyop.getMapFace $ chn f
	count = face.count
	for v = 1 to count do sum += (polyop.getMapVert $ chn face[v]).y
	sum /= count
	sum = (sum*gradients+.5) as integer + 1
	polyop.setFaceMatID o f sum
)
/* test */
mat = multiSubMaterial numsubs:0
col = red
for n = 1 to gradients do
(
	mat.materialList[n] = standard diffuseColor:(col.hue = (255./gradients)*n;col)
	mat.materialIDlist[n] = n
)
o.material = mat
)

for g in selection do
(
	numfaces = getnumfaces g.mesh
	for i = 1 to numfaces do
	(
		vi = getTVface g.mesh i
		v1 = getTvert g.mesh vi.x
		v2 = getTvert g.mesh vi.y
		v3 = getTvert g.mesh vi.z
		averageUV = (v1+v2+v3)/3
		matid = (floor (averageUV.y+1)) as integer
		m1 = getfacematid g.mesh i
		polyop.setfacematid g i matid
		m2 = getfacematid g.mesh i
	)
	update g
)

…oops. i’m late. btw, does anybody know why SetFaceMatID doesn’t work? only one of polyop struct really set ID.

let’s understand that the OP is not a tech guy, he’s an artist,
Explaining things in a technical way its not usual or easy for those who are starting to learn mxs.

there are 3 options:

1. ignore the thread (something I tend to do alot)
2. explain your point of view, and give an example somehow like in post #10
3. play for fun, with the most logical meaning:

he says polygons = must be the center
99% of modelers use editable_poly
it’s rare to use world space

and indeed a good clear explanation is the ideal.
but forums like this tend to be very far from the ‘ideal’

Not even with a proper question, people on this forum should get the answer.

The answer should always come from them.
Otherwise there are professionals waiting for paid work…

But as i said, I break that rule… because I don’t really take the answer seriously in the sense of what is best for the person who ask. So I can easily criticize myself and everybody who is giving direct solutions for others to copy/paste.

all right here is an screenshot,
there’s a teapot and the uv’s of the teapot, all the poligons within the range from 0 to 1 in V should get ID material 1, all the polygons within the range from 1 to 2 in V should get ID mat =2 and so on when running the script, does that make any sense now?
thanks for the help, appreciated!

i like how you do it. almost everything is right. but there are some details…
all your calcs made in mesh space, but the face ID your apply is in poly space. you have to understand that mesh face index and poly face index are different.
another thing…
floor … blah … to integer works, but there is the mod function to do the same.