I know that single vertex can be assigned to several map verticles and vice versa.
But, does the faces and map faces has 1:1 relationship?
I mean, assuming that mesh uses only map channel 1:
local facesCount = polyOp.getNumFaces ePoly
for f = 1 to facesCount do (
...
)
local mapFacesCount = (polyop.getNumMapFaces ePoly 1)
for u = 1 to mapFacesCount do (
...
)
Will f and u iterate over same range? I've tested it and it mapFacesCount was always equal facesCount, but I am not sure if it's true.
Also, do faces indices and map faces indices correspond with each other?
I mean, will (polyOp.getFaceVerts ePoly 10) return the vertices of face #10 and (polyOp.getMapFace ePoly 1 10) will give me map vertices for the same face #10?
Or I cannot say it's still face #10? If so, how to "connect" this data? I want to get vertices' positions and vertices' map coordinates for given face.
Yes and yes, the number and indices of faces stay the same. Although you can have invisible edges define map seams when using editable mesh, it's a different case with editable poly which is not defined by triangle faces and instead has polygons of arbitrary degree. Because you cannot split a polygon like this, the polygon count and the order do not change.
It's vertices that basically define the map seams and layout and there can be up to sum(face1VertCount..faceNVertCount) vertices – and there can also be just one vertex for all the faces.