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Fix #120698: GPv3: Don't move the first stroke point #121011

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Lukas Tönne merged 1 commits from LukasTonne/blender:fix-gp3-point-first-point into main 2024-04-24 11:54:13 +02:00
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Lukas Tönne commented 2024-04-24 11:07:11 +02:00
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There are two ways the first stroke point is moved after initial
placement:

  • The process_extension_sample overwrites the initial values of the
    sample point after process_start_sample. It copies the new sample
    position, until a threshold (3 pixels) is reached and the 2nd point
    is created, and the 1st point remains stationary.
  • After initial placement the point may still get shifted due to the
    resampling and interpolation used. Long sections between stroke
    samples may get subdivided and the positions of the two samples are
    linearly interpolated. However, the interpolation starts at 1/n,
    meaning the first interpolated point never matches the first sample.
    This is correct for later samples where the last point should not be
    repeated, but it ends up moving the first curve point again when the
    2nd sample is processed.

This patch fixes both issues by keeping the first generated point
stationary and never touching its position again.

There are two ways the first stroke point is moved after initial placement: - The `process_extension_sample` overwrites the initial values of the sample point after `process_start_sample`. It copies the _new_ sample position, until a threshold (3 pixels) is reached and the 2nd point is created, and the 1st point remains stationary. - After initial placement the point may still get shifted due to the resampling and interpolation used. Long sections between stroke samples may get subdivided and the positions of the two samples are linearly interpolated. However, the interpolation starts at 1/n, meaning the first interpolated point never matches the first sample. This is correct for later samples where the last point should not be repeated, but it ends up moving the first curve point again when the 2nd sample is processed. This patch fixes both issues by keeping the first generated point stationary and never touching its position again.
Lukas Tönne added 1 commit 2024-04-24 11:07:20 +02:00
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7deb55a0a6 Fix #120698: Don't move the first stroke point. 
There are two ways the first stroke point is moved after initial
placement:
- The `process_extension_sample` overwrites the initial values of the
  sample point after `process_start_sample`. It copies the _new_ sample
  position, until a threshold (3 pixels) is reached and the 2nd point
  is created, and the 1st point remains stationary.
- After initial placement the point may still get shifted due to the
  resampling and interpolation used. Long sections between stroke
  samples may get subdivided and the positions of the two samples are
  linearly interpolated. However, the interpolation starts at 1/n,
  meaning the first interpolated point never matches the first sample.
  This is correct for later samples where the last point should not be
  repeated, but it ends up moving the first curve point again when the
  2nd sample is processed.

This patch fixes both issues by keeping the first generated point
stationary and never touching its position again.
Lukas Tönne added this to the Grease Pencil project 2024-04-24 11:07:24 +02:00
Falk David approved these changes 2024-04-24 11:14:08 +02:00
Falk David left a comment
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Thanks, looks good.

Thanks, looks good.
Falk David commented 2024-04-24 11:14:19 +02:00
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@blender-bot build

@blender-bot build
Lukas Tönne merged commit 11bfac7f11 into main 2024-04-24 11:54:13 +02:00
Lukas Tönne deleted branch fix-gp3-point-first-point 2024-04-24 11:54:15 +02:00
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