Blender Python UV 学习

Blender Python UV 学习

1. bmesh面转换

bm = bmesh.from_edit_mesh(bpy.context.edit_object.data)
bm.faces.ensure_lookup_table()

2. 面选择

# Index of face to texture
face_ind = 0
bpy.ops.mesh.select_all(action='DESELECT')
bm.faces[face_ind].select = True

3. uv展开

# Unwrap to instantiate uv layer (对选择表面, 展开uv层)
bpy.ops.uv.unwrap()

4. 得到uv BMLayerItem

# Grab uv layer
uv_layer = bm.loops.layers.uv.active

bm.loops <bmesh.types.BMLoopSeq>

    This meshes loops (read-only).
    Note: Loops must be accessed via faces, this is only exposed for layer access.

bm.loops.layers <bmesh.types.BMLayerAccessLoop>

    custom-data layers (read-only).

bm.loops.layers.uv <bmesh.types.BMLayerCollection>

    Accessor for BMLoopUV UV (as a 2D Vector).

bm.loops.layers.uv.active <bmesh.types.BMLayerItem>

    The active layer of this type (read-only).

bmesh.types.BMLayerItem

    Exposes a single custom data layer, their main purpose is for use as item accessors to custom-data when used with vert/edge/face/loop data.

5. 开始uv映射

# Begin mapping...
loop_data = bm.faces[face_ind].loops

bm.faces <bmesh.types.BMFaceSeq>

    This meshes face sequence (read-only).

bm.faces[face_ind] <bmesh.types.BMFace>

bm.faces[face_ind].loops <bmesh.types.BMElemSeq of BMLoop>

bmesh.types.BMLoop

This is normally accessed from BMFace.loops where each face loop represents a corner of the face.

# bottom right
uv_data = loop_data[0][uv_layer].uv
uv_data.x = 1.0
uv_data.y = 0.0