feat: flatten uv backward search mode
- support backward successive face searching to resolve some failed flatten uv in floor mode.
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@ -16,6 +16,23 @@ class FlattenMethod(enum.IntEnum):
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# Not only V axis, but also U axis' continuity will been make sure.
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Wood = enum.auto()
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class NeighborType(enum.IntEnum):
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"""
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NeighborType is used by special flatten uv to describe the direction of neighbor.
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Normally we find neighbor by +V, +U direction (in UV world), these neighbors are "forward" neighbors and marked as Forward.
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But if we try finding neighbor by -V, -U direction, we call these neighbors are "backward" neighbors,
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and marked as VerticalBackward or HorizontalBackward by its direction.
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The UV of Backward neighbor need to be processed specially so we need distinguish them with Forward neighbors.
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"""
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# +V, +U direction neighbor.
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Forward = enum.auto()
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# -V direction neighbor.
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VerticalBackward = enum.auto()
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# -U direction neighbor.
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HorizontalBackward = enum.auto()
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class FlattenParam():
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mReferenceEdge: int
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mUseRefPoint: bool
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@ -283,21 +300,20 @@ def _specific_flatten_uv(bm: bmesh.types.BMesh, uv_layer: bmesh.types.BMLayerIte
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# prepare a function to check whether face is valid
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def face_validator(f: bmesh.types.BMFace) -> bool:
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# specify use external failed counter
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# specify using external failed counter
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nonlocal failed
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# a valid face must be
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# selected, not processed, and should be rectangle
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# we check selection first
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if not f.select or f.tag: return False
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# then check tag. if tag == True, it mean this face has been processed.
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if f.tag: return False
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if not f.select or f.tag: return False
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# now this face can be processed, we need check whether it is rectangle
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if len(f.loops) == 4:
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# yes it is rectangle
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return True
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else:
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# no, it is not rectangle
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# we need mark it tag as True to prevent any possible recursive checking
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# we need mark its tag as True to prevent any possible recursive checking
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# because it definately can not be processed in future.
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f.tag = True
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# then we report this face failed
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@ -339,7 +355,7 @@ def _specific_flatten_uv(bm: bmesh.types.BMesh, uv_layer: bmesh.types.BMLayerIte
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return neighbor_f
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# prepare face stack.
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# NOTE: all face inserted into this stack should be marked as processed first.
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face_stack: collections.deque[tuple[bmesh.types.BMFace, mathutils.Vector]] = collections.deque()
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face_stack: collections.deque[tuple[bmesh.types.BMFace, mathutils.Vector, NeighborType]] = collections.deque()
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# start process faces
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while True:
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# if no item in face stack, pick one from face getter and mark it as processed
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@ -348,12 +364,12 @@ def _specific_flatten_uv(bm: bmesh.types.BMesh, uv_layer: bmesh.types.BMLayerIte
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try:
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f = next(face_getter)
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f.tag = True
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face_stack.append((f, mathutils.Vector((0, 0))))
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face_stack.append((f, mathutils.Vector((0, 0)), NeighborType.Forward))
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except StopIteration:
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break
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# pick one face from stack and process it
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(face, face_offset) = face_stack.pop()
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(face, face_offset, face_backward) = face_stack.pop()
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_flatten_face_uv(face, uv_layer, flatten_param, face_offset)
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# get 4 point uv because we need use them later
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@ -380,9 +396,9 @@ def _specific_flatten_uv(bm: bmesh.types.BMesh, uv_layer: bmesh.types.BMLayerIte
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uv2 = _get_face_vertex_uv(face, uv_layer, ind2)
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uv3 = _get_face_vertex_uv(face, uv_layer, ind3)
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# insert horizontal neighbor if we are wood flatten uv
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# correct rectangle shape when in wood mode
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if flatten_param.mFlattenMethod == FlattenMethod.Wood:
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# first, make its uv geometry to rectangle from a trapezium.
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# make its uv geometry to rectangle from a trapezium.
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# get the average U factor from its right edge.
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# and make top + bottom uv edge be parallel with U axis by using left edge V factor.
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average_u = (uv2[0] + uv3[0]) / 2
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@ -390,22 +406,67 @@ def _specific_flatten_uv(bm: bmesh.types.BMesh, uv_layer: bmesh.types.BMLayerIte
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uv3 = (average_u, uv0[1])
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_set_face_vertex_uv(face, uv_layer, ind2, uv2)
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_set_face_vertex_uv(face, uv_layer, ind3, uv3)
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# then, try getting its right neighbor
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# do backward correction
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# in backward mode, we can not know how many space backward one will occupied,
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# thus we can not pass it by offset because we don't know the offset,
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# so we only can patch it after computing its real size.
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if face_backward != NeighborType.Forward:
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if face_backward == NeighborType.VerticalBackward:
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# in vertical backward patch,
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# minus self height for all uv.
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self_height: float = uv1[1] - uv0[1]
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uv0 = (uv0[0], uv0[1] - self_height)
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uv1 = (uv1[0], uv1[1] - self_height)
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uv2 = (uv2[0], uv2[1] - self_height)
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uv3 = (uv3[0], uv3[1] - self_height)
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if face_backward == NeighborType.HorizontalBackward:
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# in horizontal backward patch, minus self width for all uv.
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# because we have process rectangle shape issue before this,
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# so we can pick uv2 or uv3 to get width directly.
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self_width: float = uv3[0] - uv0[0]
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uv0 = (uv0[0] - self_width, uv0[1])
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uv1 = (uv1[0] - self_width, uv1[1])
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uv2 = (uv2[0] - self_width, uv2[1])
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uv3 = (uv3[0] - self_width, uv3[1])
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# set modified uv to geometry
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_set_face_vertex_uv(face, uv_layer, ind0, uv0)
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_set_face_vertex_uv(face, uv_layer, ind1, uv1)
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_set_face_vertex_uv(face, uv_layer, ind2, uv2)
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_set_face_vertex_uv(face, uv_layer, ind3, uv3)
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# insert horizontal neighbor only in wood mode.
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if flatten_param.mFlattenMethod == FlattenMethod.Wood:
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# insert right neighbor (forward)
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r_face: bmesh.types.BMFace | None = face_neighbor_getter(face, ind2, ind0)
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if r_face is not None:
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# mark it as processed
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r_face.tag = True
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# insert face with extra horizontal offset.
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face_stack.append((r_face, mathutils.Vector((uv3[0], uv3[1]))))
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face_stack.append((r_face, mathutils.Vector((uv3[0], uv3[1])), NeighborType.Forward))
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# insert left neighbor (backward)
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# swap the index param of neighbor getter
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l_face: bmesh.types.BMFace | None = face_neighbor_getter(face, ind0, ind2)
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if l_face is not None:
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l_face.tag = True
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# pass origin pos, and order backward correction
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face_stack.append((l_face, mathutils.Vector((uv0[0], uv0[1])), NeighborType.HorizontalBackward))
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# insert vertical neighbor
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# insert top neighbor (forward)
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t_face: bmesh.types.BMFace | None = face_neighbor_getter(face, ind1, ind3)
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if t_face is not None:
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# mark it as processed
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t_face.tag = True
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# insert face with extra vertical offset.
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face_stack.append((t_face, mathutils.Vector((uv1[0], uv1[1]))))
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face_stack.append((t_face, mathutils.Vector((uv1[0], uv1[1])), NeighborType.Forward))
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# insert bottom neighbor (backward)
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# swap the index param of neighbor getter
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b_face: bmesh.types.BMFace | None = face_neighbor_getter(face, ind3, ind1)
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if b_face is not None:
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b_face.tag = True
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# pass origin pos, and order backward correction
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face_stack.append((b_face, mathutils.Vector((uv0[0], uv0[1])), NeighborType.VerticalBackward))
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return failed
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