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MayaAdvent Calendar 2023

Day 4

mayaでUVエリア毎のfaceを選択したい

Last updated at Posted at 2023-12-03

UVエリア毎のfaceを選択したい
そんな気分になりました。

さてどうしよう

1つのfaceに対して、そのfaceが持ってるUV情報を取得して
そのUV座標をみて範囲内に収まってるか否かを判別して・・・・
うーん
image.png

しばしAPIのリファレンスを眺める

おーなんかあった
https://help.autodesk.com/view/MAYAUL/2022/JPN/?guid=Maya_SDK_py_ref_class_open_maya_1_1_m_it_mesh_polygon_html

def OpenMaya.MItMeshPolygon.getUVArea()
getUVArea(uvSet=None) -> float
This method gets the UV area of the face

  • uvSet (string) - UV set to work with

ん~ とりあえずgetUVAreaを試してみますか

getUVArea 一旦君に決めた

import maya.api.OpenMaya as om
target = "pPlane1"
faceIds = []
mesh_dagPath = om.MGlobal.getSelectionListByName(target).getDagPath(0)
shape_Fn = om.MFnMesh(mesh_dagPath)
face_ids = range(0,shape_Fn.numPolygons)
it = om.MItMeshPolygon(mesh_dagPath)
for index in face_ids:
    it.setIndex(index)
    print(it.getUVArea())

0.08533608913421631
0.1096273809671402
0.08724434673786163
0.08724430203437805

(´A)?
あー・・・・・これは?
UVの?面積?かな?
うん 今回は使えない

別の方法を探す

def OpenMaya.MItMeshPolygon.getUVs()
getUVs(uvSet=None) -> [MFloatArray, MFloatArray]
Return the all the texture coordinates for the vertices of this face (in local vertex order).

  • uvSet (string) - UV set to work with

こいつで、faceが持ってるUV情報を全部引き出せるのかな?

import maya.api.OpenMaya as om
target = "pPlane1"
faceIds = []
faceIds = []
mesh_dagPath = om.MGlobal.getSelectionListByName(target).getDagPath(0)
shape_Fn = om.MFnMesh(mesh_dagPath)
face_ids = range(0,shape_Fn.numPolygons)
it = om.MItMeshPolygon(mesh_dagPath)

for index in face_ids:
    it.setIndex(index)
    uvs = it.getUVs()
    print(uvs)

[maya.api.OpenMaya.MFloatArray([0.1039382815361023, 0.3960617184638977, 0.3960617184638977, 0.1039382815361023]), maya.api.OpenMaya.MFloatArray([0.1039382815361023, 0.1039382815361023, 0.3960617184638977, 0.3960617184638977])]
[maya.api.OpenMaya.MFloatArray([0.5844498872756958, 0.9155501127243042, 0.9155501127243042, 0.5844498872756958]), maya.api.OpenMaya.MFloatArray([0.08444985747337341, 0.08444985747337341, 0.4155501425266266, 0.4155501425266266])]
[maya.api.OpenMaya.MFloatArray([0.10231424868106842, 0.3976857662200928, 0.3976857662200928, 0.10231424868106842]), maya.api.OpenMaya.MFloatArray([0.6023142337799072, 0.6023142337799072, 0.8976857662200928, 0.8976857662200928])]
[maya.api.OpenMaya.MFloatArray([0.6023142337799072, 0.8976857662200928, 0.8976857662200928, 0.6023142337799072]), maya.api.OpenMaya.MFloatArray([0.6023142337799072, 0.6023142337799072, 0.8976857662200928, 0.8976857662200928])]

うん っぽいな

雑に実装

import maya.api.OpenMaya as om

def findFaceUVRange(target,UVRange):
    faceIds = []
    mesh_dagPath = om.MGlobal.getSelectionListByName(target).getDagPath(0)
    shape_Fn = om.MFnMesh(mesh_dagPath)
    face_ids = range(0,shape_Fn.numPolygons)
    it = om.MItMeshPolygon(mesh_dagPath)

    for index in face_ids:
        #faceID をセット
        it.setIndex(index)
        
        #facenのUV情報を取得
        uvs = it.getUVs()

        #指定したエリア内に有るか否かステータス
        insideRange = True        

        #U 座標評価
        for uPoint in uvs[0]:
            if uPoint < UVRange[0] or  uPoint > UVRange[1]:
                insideRange = False
        #V 座標評価         
        for vPoint in uvs[1]:            
            if vPoint < UVRange[2] or  vPoint > UVRange[3]:
                insideRange = False
        
        #範囲内にあるならIDを追加
        if insideRange:
            faceIds.append(index)

    result = []
    for faceId in faceIds:
        result.append(target+".f["+str(faceId)+"]")
        
    return result
    
cmds.select(findFaceUVRange("pPlane1",[0.0,0.5,0.5,1.0]),r=True)

実行結果
image.png

ヤッター

何に使えるか?

経緯としてはUDIMを使用しているオブジェクトで、
faceアサインでも良いのでUDIMを使わない構成に変えたくなって、
その際にUDIM使ったオブジェクトとマテリアルが複数あって、
あぁもう面倒だなぁ
というのが発端でした。

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