Add data transfer mapping with interpolation that preserves seams of face corner data #97070

New Issue

Simon Thommes · 2022-04-05T12:47:38+02:00

Simon Thommes commented

2022-04-05 12:47:38 +02:00

The existing mapping options for face corner data in Blender don't allow for preserving seams while still interpolating whenever it makes sense.

Here is a video comparing the available methods in Blender with the proposed prototype, implemented with python.
proximity_based_face_corner_transfer-2022-04-04_15.55.09.mp4
And the file:
loop_data_transfer.blend

The idea of the algorithm in pseudo code is the following:

find closest face on source mesh to target face center
find closest face on source mesh to target corner position

if those are the same face set this as the interpolation source face

else find the closest face to the target corner that is not separated by a seam
(by traversing on direct way from the target face center towards target corner until a seam edge is hit)
set that face as the interpolation source face

interpolate the data from the closest point on the interpolation source face to the target corner

There are some issues still to be improved in this:

faces with more than 2 face neighbors
target points that are outside of the bounds of the source mesh
my initial implementation uses only proximity, projection would also be a viable option here.

The existing mapping options for face corner data in Blender don't allow for preserving seams while still interpolating whenever it makes sense. Here is a video comparing the available methods in Blender with the proposed prototype, implemented with python. [proximity_based_face_corner_transfer-2022-04-04_15.55.09.mp4](https://archive.blender.org/developer/F12975179/proximity_based_face_corner_transfer-2022-04-04_15.55.09.mp4) And the file: [loop_data_transfer.blend](https://archive.blender.org/developer/F12975184/loop_data_transfer.blend) The idea of the algorithm in pseudo code is the following: ``` find closest face on source mesh to target face center find closest face on source mesh to target corner position if those are the same face set this as the interpolation source face else find the closest face to the target corner that is not separated by a seam (by traversing on direct way from the target face center towards target corner until a seam edge is hit) set that face as the interpolation source face interpolate the data from the closest point on the interpolation source face to the target corner ``` There are some issues still to be improved in this: - faces with more than 2 face neighbors - target points that are outside of the bounds of the source mesh - my initial implementation uses only proximity, projection would also be a viable option here.

Simon Thommes commented

2022-04-05 12:47:38 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Simon Thommes commented

2022-04-05 12:47:38 +02:00

Added subscribers: @SimonThommes, @mont29

Philipp Oeser removed the

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Add data transfer mapping with interpolation that preserves seams of face corner data #97070