Uv Operators

bpy.ops.uv.align(axis='ALIGN_AUTO')

Align selected UV vertices to an axis

Parameters

axis (enum in ['ALIGN_S', 'ALIGN_T', 'ALIGN_U', 'ALIGN_AUTO', 'ALIGN_X', 'ALIGN_Y'], (optional)) –

Axis, Axis to align UV locations on

ALIGN_S Straighten – Align UVs along the line defined by the endpoints.
ALIGN_T Straighten X – Align UVs along the line defined by the endpoints along the X axis.
ALIGN_U Straighten Y – Align UVs along the line defined by the endpoints along the Y axis.
ALIGN_AUTO Align Auto – Automatically choose the axis on which there is most alignment already.
ALIGN_X Align X – Align UVs on X axis.
ALIGN_Y Align Y – Align UVs on Y axis.

bpy.ops.uv.align_rotation(method='AUTO', axis='X')

Align the UV island’s rotation

Parameters

method (enum in ['AUTO', 'EDGE', 'GEOMETRY'], (optional)) –
Method, Method to calculate rotation angle
- AUTO Auto – Align from all edges.
- EDGE Edge – Only selected edges.
- GEOMETRY Geometry – Align to Geometry axis.
axis (enum in ['X', 'Y', 'Z'], (optional)) –
Axis, Axis to align to
- X X – X axis.
- Y Y – Y axis.
- Z Z – Z axis.

File

startup/bl_operators/uvcalc_transform.py:275

bpy.ops.uv.average_islands_scale(scale_uv=False, shear=False)

Average the size of separate UV islands, based on their area in 3D space

Parameters

scale_uv (boolean, (optional)) – Non-Uniform, Scale U and V independently
shear (boolean, (optional)) – Shear, Reduce shear within islands

bpy.ops.uv.copy(): Copy selected UV vertices

bpy.ops.uv.cube_project(cube_size=1.0, correct_aspect=True, clip_to_bounds=False, scale_to_bounds=False)

Project the UV vertices of the mesh over the six faces of a cube

Parameters

cube_size (float in [0, inf], (optional)) – Cube Size, Size of the cube to project on
correct_aspect (boolean, (optional)) – Correct Aspect, Map UVs taking image aspect ratio into account
clip_to_bounds (boolean, (optional)) – Clip to Bounds, Clip UV coordinates to bounds after unwrapping
scale_to_bounds (boolean, (optional)) – Scale to Bounds, Scale UV coordinates to bounds after unwrapping

bpy.ops.uv.cursor_set(location=(0.0, 0.0))

Set 2D cursor location

Parameters: location (mathutils.Vector of 2 items in [-inf, inf], (optional)) – Location, Cursor location in normalized (0.0 to 1.0) coordinates

bpy.ops.uv.cylinder_project(direction='VIEW_ON_EQUATOR', align='POLAR_ZX', pole='PINCH', radius=1.0, correct_aspect=True, clip_to_bounds=False, scale_to_bounds=False)

Project the UV vertices of the mesh over the curved wall of a cylinder

Parameters

direction (enum in ['VIEW_ON_EQUATOR', 'VIEW_ON_POLES', 'ALIGN_TO_OBJECT'], (optional)) –
Direction, Direction of the sphere or cylinder
- VIEW_ON_EQUATOR View on Equator – 3D view is on the equator.
- VIEW_ON_POLES View on Poles – 3D view is on the poles.
- ALIGN_TO_OBJECT Align to Object – Align according to object transform.
align (enum in ['POLAR_ZX', 'POLAR_ZY'], (optional)) –
Align, How to determine rotation around the pole
- POLAR_ZX Polar ZX – Polar 0 is X.
- POLAR_ZY Polar ZY – Polar 0 is Y.
pole (enum in ['PINCH', 'FAN'], (optional)) –
Pole, How to handle faces at the poles
- PINCH Pinch – UVs are pinched at the poles.
- FAN Fan – UVs are fanned at the poles.
radius (float in [0, inf], (optional)) – Radius, Radius of the sphere or cylinder
correct_aspect (boolean, (optional)) – Correct Aspect, Map UVs taking image aspect ratio into account
clip_to_bounds (boolean, (optional)) – Clip to Bounds, Clip UV coordinates to bounds after unwrapping
scale_to_bounds (boolean, (optional)) – Scale to Bounds, Scale UV coordinates to bounds after unwrapping

bpy.ops.uv.export_layout(filepath='', export_all=False, modified=False, mode='PNG', size=(1024, 1024), opacity=0.25, check_existing=True)

Export UV layout to file

Parameters

filepath (string, (optional, never None)) – filepath
export_all (boolean, (optional)) – All UVs, Export all UVs in this mesh (not just visible ones)
modified (boolean, (optional)) – Modified, Exports UVs from the modified mesh
mode (enum in ['SVG', 'EPS', 'PNG'], (optional)) –
Format, File format to export the UV layout to
- SVG Scalable Vector Graphic (.svg) – Export the UV layout to a vector SVG file.
- EPS Encapsulate PostScript (.eps) – Export the UV layout to a vector EPS file.
- PNG PNG Image (.png) – Export the UV layout to a bitmap image.
size (int array of 2 items in [8, 32768], (optional)) – size, Dimensions of the exported file
opacity (float in [0, 1], (optional)) – Fill Opacity, Set amount of opacity for exported UV layout
check_existing (boolean, (optional)) – check_existing

File

addons/io_mesh_uv_layout/__init__.py:118

bpy.ops.uv.follow_active_quads(mode='LENGTH_AVERAGE')

Follow UVs from active quads along continuous face loops

Parameters

mode (enum in ['EVEN', 'LENGTH', 'LENGTH_AVERAGE'], (optional)) –

Edge Length Mode, Method to space UV edge loops

EVEN Even – Space all UVs evenly.
LENGTH Length – Average space UVs edge length of each loop.
LENGTH_AVERAGE Length Average – Average space UVs edge length of each loop.

File

startup/bl_operators/uvcalc_follow_active.py:257

bpy.ops.uv.hide(unselected=False)

Hide (un)selected UV vertices

Parameters: unselected (boolean, (optional)) – Unselected, Hide unselected rather than selected

bpy.ops.uv.lightmap_pack(PREF_CONTEXT='SEL_FACES', PREF_PACK_IN_ONE=True, PREF_NEW_UVLAYER=False, PREF_APPLY_IMAGE=False, PREF_IMG_PX_SIZE=512, PREF_BOX_DIV=12, PREF_MARGIN_DIV=0.1)

Pack each face’s UVs into the UV bounds

Parameters

PREF_CONTEXT (enum in ['SEL_FACES', 'ALL_FACES'], (optional)) –
Selection
- SEL_FACES Selected Faces – Space all UVs evenly.
- ALL_FACES All Faces – Average space UVs edge length of each loop.
PREF_PACK_IN_ONE (boolean, (optional)) – Share Texture Space, Objects share texture space, map all objects into a single UV map
PREF_NEW_UVLAYER (boolean, (optional)) – New UV Map, Create a new UV map for every mesh packed
PREF_APPLY_IMAGE (boolean, (optional)) – New Image, Assign new images for every mesh (only one if Share Texture Space is enabled)
PREF_IMG_PX_SIZE (int in [64, 5000], (optional)) – Image Size, Width and height for the new image
PREF_BOX_DIV (int in [1, 48], (optional)) – Pack Quality, Quality of the packing. Higher values will be slower but waste less space
PREF_MARGIN_DIV (float in [0.001, 1], (optional)) – Margin, Size of the margin as a division of the UV

File

startup/bl_operators/uvcalc_lightmap.py:661

bpy.ops.uv.mark_seam(clear=False)

Mark selected UV edges as seams

Parameters: clear (boolean, (optional)) – Clear Seams, Clear instead of marking seams

bpy.ops.uv.minimize_stretch(fill_holes=True, blend=0.0, iterations=0)

Reduce UV stretching by relaxing angles

Parameters

fill_holes (boolean, (optional)) – Fill Holes, Virtually fill holes in mesh before unwrapping, to better avoid overlaps and preserve symmetry
blend (float in [0, 1], (optional)) – Blend, Blend factor between stretch minimized and original
iterations (int in [0, inf], (optional)) – Iterations, Number of iterations to run, 0 is unlimited when run interactively

bpy.ops.uv.pack_islands(udim_source='CLOSEST_UDIM', rotate=True, margin_method='SCALED', margin=0.001)

Transform all islands so that they fill up the UV/UDIM space as much as possible

Parameters

udim_source (enum in ['CLOSEST_UDIM', 'ACTIVE_UDIM'], (optional)) –
Pack to
- CLOSEST_UDIM Closest UDIM – Pack islands to closest UDIM.
- ACTIVE_UDIM Active UDIM – Pack islands to active UDIM image tile or UDIM grid tile where 2D cursor is located.
rotate (boolean, (optional)) – Rotate, Rotate islands for best fit
margin_method (enum in ['SCALED', 'ADD', 'FRACTION'], (optional)) –
Margin Method
- SCALED Scaled – Use scale of existing UVs to multiply margin.
- ADD Add – Just add the margin, ignoring any UV scale.
- FRACTION Fraction – Specify a precise fraction of final UV output.
margin (float in [0, 1], (optional)) – Margin, Space between islands

bpy.ops.uv.paste(): Paste selected UV vertices

bpy.ops.uv.pin(clear=False)

Set/clear selected UV vertices as anchored between multiple unwrap operations

Parameters: clear (boolean, (optional)) – Clear, Clear pinning for the selection instead of setting it

bpy.ops.uv.project_from_view(orthographic=False, camera_bounds=True, correct_aspect=True, clip_to_bounds=False, scale_to_bounds=False)

Project the UV vertices of the mesh as seen in current 3D view

Parameters

orthographic (boolean, (optional)) – Orthographic, Use orthographic projection
camera_bounds (boolean, (optional)) – Camera Bounds, Map UVs to the camera region taking resolution and aspect into account
correct_aspect (boolean, (optional)) – Correct Aspect, Map UVs taking image aspect ratio into account
clip_to_bounds (boolean, (optional)) – Clip to Bounds, Clip UV coordinates to bounds after unwrapping
scale_to_bounds (boolean, (optional)) – Scale to Bounds, Scale UV coordinates to bounds after unwrapping

bpy.ops.uv.randomize_uv_transform(random_seed=0, use_loc=True, loc=(0.0, 0.0), use_rot=True, rot=0.0, use_scale=True, scale_even=False, scale=(1.0, 1.0))

Randomize the UV island’s location, rotation, and scale

Parameters

random_seed (int in [0, 10000], (optional)) – Random Seed, Seed value for the random generator
use_loc (boolean, (optional)) – Randomize Location, Randomize the location values
loc (mathutils.Vector of 2 items in [-100, 100], (optional)) – Location, Maximum distance the objects can spread over each axis
use_rot (boolean, (optional)) – Randomize Rotation, Randomize the rotation value
rot (float in [-6.28319, 6.28319], (optional)) – Rotation, Maximum rotation
use_scale (boolean, (optional)) – Randomize Scale, Randomize the scale values
scale_even (boolean, (optional)) – Scale Even, Use the same scale value for both axes
scale (float array of 2 items in [-100, 100], (optional)) – Scale, Maximum scale randomization over each axis

File

startup/bl_operators/uvcalc_transform.py:449

bpy.ops.uv.remove_doubles(threshold=0.02, use_unselected=False)

Selected UV vertices that are within a radius of each other are welded together

Parameters

threshold (float in [0, 10], (optional)) – Merge Distance, Maximum distance between welded vertices
use_unselected (boolean, (optional)) – Unselected, Merge selected to other unselected vertices

bpy.ops.uv.reset(): Reset UV projection

bpy.ops.uv.reveal(select=True)

Reveal all hidden UV vertices

Parameters: select (boolean, (optional)) – Select

bpy.ops.uv.rip(mirror=False, release_confirm=False, use_accurate=False, location=(0.0, 0.0))

Rip selected vertices or a selected region

Parameters

mirror (boolean, (optional)) – Mirror Editing
release_confirm (boolean, (optional)) – Confirm on Release, Always confirm operation when releasing button
use_accurate (boolean, (optional)) – Accurate, Use accurate transformation
location (mathutils.Vector of 2 items in [-inf, inf], (optional)) – Location, Mouse location in normalized coordinates, 0.0 to 1.0 is within the image bounds

bpy.ops.uv.rip_move(UV_OT_rip=None, TRANSFORM_OT_translate=None)

Unstitch UVs and move the result

Parameters

UV_OT_rip (UV_OT_rip, (optional)) – UV Rip, Rip selected vertices or a selected region
TRANSFORM_OT_translate (TRANSFORM_OT_translate, (optional)) – Move, Move selected items

bpy.ops.uv.seams_from_islands(mark_seams=True, mark_sharp=False)

Set mesh seams according to island setup in the UV editor

Parameters

mark_seams (boolean, (optional)) – Mark Seams, Mark boundary edges as seams
mark_sharp (boolean, (optional)) – Mark Sharp, Mark boundary edges as sharp

bpy.ops.uv.select(extend=False, deselect=False, toggle=False, deselect_all=False, select_passthrough=False, location=(0.0, 0.0))

Select UV vertices

Parameters

extend (boolean, (optional)) – Extend, Extend selection instead of deselecting everything first
deselect (boolean, (optional)) – Deselect, Remove from selection
toggle (boolean, (optional)) – Toggle Selection, Toggle the selection
deselect_all (boolean, (optional)) – Deselect On Nothing, Deselect all when nothing under the cursor
select_passthrough (boolean, (optional)) – Only Select Unselected, Ignore the select action when the element is already selected
location (mathutils.Vector of 2 items in [-inf, inf], (optional)) – Location, Mouse location in normalized coordinates, 0.0 to 1.0 is within the image bounds

bpy.ops.uv.select_all(action='TOGGLE')

Change selection of all UV vertices

Parameters

action (enum in ['TOGGLE', 'SELECT', 'DESELECT', 'INVERT'], (optional)) –

Action, Selection action to execute

TOGGLE Toggle – Toggle selection for all elements.
SELECT Select – Select all elements.
DESELECT Deselect – Deselect all elements.
INVERT Invert – Invert selection of all elements.

bpy.ops.uv.select_box(pinned=False, xmin=0, xmax=0, ymin=0, ymax=0, wait_for_input=True, mode='SET')

Select UV vertices using box selection

Parameters

pinned (boolean, (optional)) – Pinned, Border select pinned UVs only
xmin (int in [-inf, inf], (optional)) – X Min
xmax (int in [-inf, inf], (optional)) – X Max
ymin (int in [-inf, inf], (optional)) – Y Min
ymax (int in [-inf, inf], (optional)) – Y Max
wait_for_input (boolean, (optional)) – Wait for Input
mode (enum in ['SET', 'ADD', 'SUB'], (optional)) –
Mode
- SET Set – Set a new selection.
- ADD Extend – Extend existing selection.
- SUB Subtract – Subtract existing selection.

bpy.ops.uv.select_circle(x=0, y=0, radius=25, wait_for_input=True, mode='SET')

Select UV vertices using circle selection

Parameters

x (int in [-inf, inf], (optional)) – X
y (int in [-inf, inf], (optional)) – Y
radius (int in [1, inf], (optional)) – Radius
wait_for_input (boolean, (optional)) – Wait for Input
mode (enum in ['SET', 'ADD', 'SUB'], (optional)) –
Mode
- SET Set – Set a new selection.
- ADD Extend – Extend existing selection.
- SUB Subtract – Subtract existing selection.

bpy.ops.uv.select_edge_ring(extend=False, location=(0.0, 0.0))

Select an edge ring of connected UV vertices

Parameters

extend (boolean, (optional)) – Extend, Extend selection rather than clearing the existing selection
location (mathutils.Vector of 2 items in [-inf, inf], (optional)) – Location, Mouse location in normalized coordinates, 0.0 to 1.0 is within the image bounds

bpy.ops.uv.select_lasso(path=None, mode='SET')

Select UVs using lasso selection

Parameters

path (bpy_prop_collection of OperatorMousePath, (optional)) – Path
mode (enum in ['SET', 'ADD', 'SUB'], (optional)) –
Mode
- SET Set – Set a new selection.
- ADD Extend – Extend existing selection.
- SUB Subtract – Subtract existing selection.

bpy.ops.uv.select_less(): Deselect UV vertices at the boundary of each selection region

bpy.ops.uv.select_linked(): Select all UV vertices linked to the active UV map

bpy.ops.uv.select_linked_pick(extend=False, deselect=False, location=(0.0, 0.0))

Select all UV vertices linked under the mouse

Parameters

extend (boolean, (optional)) – Extend, Extend selection rather than clearing the existing selection
deselect (boolean, (optional)) – Deselect, Deselect linked UV vertices rather than selecting them
location (mathutils.Vector of 2 items in [-inf, inf], (optional)) – Location, Mouse location in normalized coordinates, 0.0 to 1.0 is within the image bounds

bpy.ops.uv.select_loop(extend=False, location=(0.0, 0.0))

Select a loop of connected UV vertices

Parameters

extend (boolean, (optional)) – Extend, Extend selection rather than clearing the existing selection
location (mathutils.Vector of 2 items in [-inf, inf], (optional)) – Location, Mouse location in normalized coordinates, 0.0 to 1.0 is within the image bounds

bpy.ops.uv.select_mode(type='VERTEX')

Change UV selection mode

Parameters: type (enum in Mesh Select Mode Uv Items, (optional)) – Type

bpy.ops.uv.select_more(): Select more UV vertices connected to initial selection

bpy.ops.uv.select_overlap(extend=False)

Select all UV faces which overlap each other

Parameters: extend (boolean, (optional)) – Extend, Extend selection rather than clearing the existing selection

bpy.ops.uv.select_pinned(): Select all pinned UV vertices

bpy.ops.uv.select_similar(type='PIN', compare='EQUAL', threshold=0.0)

Select similar UVs by property types

Parameters

type (enum in ['PIN'], (optional)) – Type
compare (enum in ['EQUAL', 'GREATER', 'LESS'], (optional)) – Compare
threshold (float in [0, 1], (optional)) – Threshold

bpy.ops.uv.select_split(): Select only entirely selected faces

bpy.ops.uv.shortest_path_pick(use_face_step=False, use_topology_distance=False, use_fill=False, skip=0, nth=1, offset=0, object_index=-1, index=-1)

Select shortest path between two selections

Parameters

use_face_step (boolean, (optional)) – Face Stepping, Traverse connected faces (includes diagonals and edge-rings)
use_topology_distance (boolean, (optional)) – Topology Distance, Find the minimum number of steps, ignoring spatial distance
use_fill (boolean, (optional)) – Fill Region, Select all paths between the source/destination elements
skip (int in [0, inf], (optional)) – Deselected, Number of deselected elements in the repetitive sequence
nth (int in [1, inf], (optional)) – Selected, Number of selected elements in the repetitive sequence
offset (int in [-inf, inf], (optional)) – Offset, Offset from the starting point

bpy.ops.uv.shortest_path_select(use_face_step=False, use_topology_distance=False, use_fill=False, skip=0, nth=1, offset=0)

Selected shortest path between two vertices/edges/faces

Parameters

use_face_step (boolean, (optional)) – Face Stepping, Traverse connected faces (includes diagonals and edge-rings)
use_topology_distance (boolean, (optional)) – Topology Distance, Find the minimum number of steps, ignoring spatial distance
use_fill (boolean, (optional)) – Fill Region, Select all paths between the source/destination elements
skip (int in [0, inf], (optional)) – Deselected, Number of deselected elements in the repetitive sequence
nth (int in [1, inf], (optional)) – Selected, Number of selected elements in the repetitive sequence
offset (int in [-inf, inf], (optional)) – Offset, Offset from the starting point

bpy.ops.uv.smart_project(angle_limit=1.15192, margin_method='SCALED', island_margin=0.0, area_weight=0.0, correct_aspect=True, scale_to_bounds=False)

Projection unwraps the selected faces of mesh objects

Parameters

angle_limit (float in [0, 1.5708], (optional)) – Angle Limit, Lower for more projection groups, higher for less distortion
margin_method (enum in ['SCALED', 'ADD', 'FRACTION'], (optional)) –
Margin Method
- SCALED Scaled – Use scale of existing UVs to multiply margin.
- ADD Add – Just add the margin, ignoring any UV scale.
- FRACTION Fraction – Specify a precise fraction of final UV output.
island_margin (float in [0, 1], (optional)) – Island Margin, Margin to reduce bleed from adjacent islands
area_weight (float in [0, 1], (optional)) – Area Weight, Weight projection’s vector by faces with larger areas
correct_aspect (boolean, (optional)) – Correct Aspect, Map UVs taking image aspect ratio into account
scale_to_bounds (boolean, (optional)) – Scale to Bounds, Scale UV coordinates to bounds after unwrapping

bpy.ops.uv.snap_cursor(target='PIXELS')

Snap cursor to target type

Parameters: target (enum in ['PIXELS', 'SELECTED', 'ORIGIN'], (optional)) – Target, Target to snap the selected UVs to

bpy.ops.uv.snap_selected(target='PIXELS')

Snap selected UV vertices to target type

Parameters: target (enum in ['PIXELS', 'CURSOR', 'CURSOR_OFFSET', 'ADJACENT_UNSELECTED'], (optional)) – Target, Target to snap the selected UVs to

bpy.ops.uv.sphere_project(direction='VIEW_ON_EQUATOR', align='POLAR_ZX', pole='PINCH', correct_aspect=True, clip_to_bounds=False, scale_to_bounds=False)

Project the UV vertices of the mesh over the curved surface of a sphere

Parameters

direction (enum in ['VIEW_ON_EQUATOR', 'VIEW_ON_POLES', 'ALIGN_TO_OBJECT'], (optional)) –
Direction, Direction of the sphere or cylinder
- VIEW_ON_EQUATOR View on Equator – 3D view is on the equator.
- VIEW_ON_POLES View on Poles – 3D view is on the poles.
- ALIGN_TO_OBJECT Align to Object – Align according to object transform.
align (enum in ['POLAR_ZX', 'POLAR_ZY'], (optional)) –
Align, How to determine rotation around the pole
- POLAR_ZX Polar ZX – Polar 0 is X.
- POLAR_ZY Polar ZY – Polar 0 is Y.
pole (enum in ['PINCH', 'FAN'], (optional)) –
Pole, How to handle faces at the poles
- PINCH Pinch – UVs are pinched at the poles.
- FAN Fan – UVs are fanned at the poles.
correct_aspect (boolean, (optional)) – Correct Aspect, Map UVs taking image aspect ratio into account
clip_to_bounds (boolean, (optional)) – Clip to Bounds, Clip UV coordinates to bounds after unwrapping
scale_to_bounds (boolean, (optional)) – Scale to Bounds, Scale UV coordinates to bounds after unwrapping

bpy.ops.uv.stitch(use_limit=False, snap_islands=True, limit=0.01, static_island=0, active_object_index=0, midpoint_snap=False, clear_seams=True, mode='VERTEX', stored_mode='VERTEX', selection=None, objects_selection_count=(0, 0, 0, 0, 0, 0))

Stitch selected UV vertices by proximity

Parameters

use_limit (boolean, (optional)) – Use Limit, Stitch UVs within a specified limit distance
snap_islands (boolean, (optional)) – Snap Islands, Snap islands together (on edge stitch mode, rotates the islands too)
limit (float in [0, inf], (optional)) – Limit, Limit distance in normalized coordinates
static_island (int in [0, inf], (optional)) – Static Island, Island that stays in place when stitching islands
active_object_index (int in [0, inf], (optional)) – Active Object, Index of the active object
midpoint_snap (boolean, (optional)) – Snap at Midpoint, UVs are stitched at midpoint instead of at static island
clear_seams (boolean, (optional)) – Clear Seams, Clear seams of stitched edges
mode (enum in ['VERTEX', 'EDGE'], (optional)) – Operation Mode, Use vertex or edge stitching
stored_mode (enum in ['VERTEX', 'EDGE'], (optional)) – Stored Operation Mode, Use vertex or edge stitching
selection (bpy_prop_collection of SelectedUvElement, (optional)) – Selection
objects_selection_count (int array of 6 items in [0, inf], (optional)) – Objects Selection Count

bpy.ops.uv.unwrap(method='ANGLE_BASED', fill_holes=True, correct_aspect=True, use_subsurf_data=False, margin_method='SCALED', margin=0.001)

Unwrap the mesh of the object being edited

Parameters

method (enum in ['ANGLE_BASED', 'CONFORMAL'], (optional)) – Method, Unwrapping method (Angle Based usually gives better results than Conformal, while being somewhat slower)
fill_holes (boolean, (optional)) – Fill Holes, Virtually fill holes in mesh before unwrapping, to better avoid overlaps and preserve symmetry
correct_aspect (boolean, (optional)) – Correct Aspect, Map UVs taking image aspect ratio into account
use_subsurf_data (boolean, (optional)) – Use Subdivision Surface, Map UVs taking vertex position after Subdivision Surface modifier has been applied
margin_method (enum in ['SCALED', 'ADD', 'FRACTION'], (optional)) –
Margin Method
- SCALED Scaled – Use scale of existing UVs to multiply margin.
- ADD Add – Just add the margin, ignoring any UV scale.
- FRACTION Fraction – Specify a precise fraction of final UV output.
margin (float in [0, 1], (optional)) – Margin, Space between islands

bpy.ops.uv.weld(): Weld selected UV vertices together