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GPv3: Drawing slow down when drawing a very long stroke #123317

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opened 2024-06-17 16:43:35 +02:00 by Antonio Vazquez · 7 comments
Antonio Vazquez commented 2024-06-17 16:43:35 +02:00
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When drawing a stroke very long without release the mouse, the drawing starts to slow down. This doesn't happen with short strokes.

To reproduce:

Just open default scene and start to draw a stroke with the mouse without releasing the mouse button.

When drawing a stroke very long without release the mouse, the drawing starts to slow down. This doesn't happen with short strokes. To reproduce: Just open default scene and start to draw a stroke with the mouse without releasing the mouse button.
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 labels 2024-06-17 16:43:36 +02:00
Antonio Vazquez added this to the Grease Pencil project 2024-06-17 16:43:36 +02:00
Hans Goudey commented 2024-06-17 19:42:32 +02:00
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Some observations:

  • 75% of the time is spent triangulating the stroke
  • 19% of the time is spent calculating the curve plane normals
  • Only 1 core is being used the whole time
Some observations: - 75% of the time is spent triangulating the stroke - 19% of the time is spent calculating the curve plane normals - Only 1 core is being used the whole time
YimingWu commented 2024-06-18 07:14:36 +02:00
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Ah I guess it's not just me 😅

Ah I guess it's not just me 😅
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Iliya Katushenock added the
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 label 2024-06-18 13:01:39 +02:00
Falk David commented 2024-06-21 10:51:25 +02:00
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Ideas for improving the performance:

  • The curve plane normals don't need to be recomputed, we know the normal of the drawing plane. In case where we draw on a surface or on other strokes, we can delay the computation until the stroke is done. We should also look at ways of improving the performance of the plane normal computation itself.
  • Unfortunately, we can't get a around the triangulation of the stroke (even if there is no fill to render). This will change in the future hopefully.
  • Since we're incrementally adding new points, it would be much better to also incrementally triangulate the fill. This would mean that with every new set of points added, we would only need to refine the triangulation instead of rebuilding it from scratch. See for example https://en.wikipedia.org/wiki/Delaunay_triangulation#Incremental.
Ideas for improving the performance: * The curve plane normals don't need to be recomputed, we know the normal of the drawing plane. In case where we draw on a surface or on other strokes, we can delay the computation until the stroke is done. We should also look at ways of improving the performance of the plane normal computation itself. * Unfortunately, we can't get a around the triangulation of the stroke (even if there is no fill to render). This will change in the future hopefully. * Since we're incrementally adding new points, it would be much better to also incrementally triangulate the fill. This would mean that with every new set of points added, we would only need to refine the triangulation instead of rebuilding it from scratch. See for example https://en.wikipedia.org/wiki/Delaunay_triangulation#Incremental.
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Dantti commented 2024-10-07 17:52:03 +02:00
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Tested this in beta again, same problem persists. If you zoom out the stoke get's wonky even faster.

Tested this in beta again, same problem persists. If you zoom out the stoke get's wonky even faster.
wonkystroke.png
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wonkystroke.png
YimingWu commented 2024-10-08 03:15:58 +02:00
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But if we need to have triangulation anyway why wouldn't old GPv2 slow down the same way 🤔

But if we need to have triangulation anyway why wouldn't old GPv2 slow down the same way 🤔
Falk David commented 2024-10-08 10:51:44 +02:00
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@ChengduLittleA GPv2 didn't do the triangulation because it didn't write the stroke to the frame, it wrote it to a temporary buffer that is rendered seperately (sbuffer). This added a lot of code, so in GPv3 we write to the drawing directly.

But like I mentioned above, we don't need to write to a temporary buffer if we improve the overall situation.

@ChengduLittleA GPv2 didn't do the triangulation because it didn't write the stroke to the frame, it wrote it to a temporary buffer that is rendered seperately (`sbuffer`). This added a lot of code, so in GPv3 we write to the drawing directly. But like I mentioned above, we don't need to write to a temporary buffer if we improve the overall situation.
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Maurits Valk commented 2024-10-09 15:23:18 +02:00
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sharing my video for reference here since my issue was a duplicate. Stroke performance drops in the first keyframe because there are more strokes than when a new keyframe with no GP Strokes

sharing my video for reference here since my issue was a duplicate. Stroke performance drops in the first keyframe because there are more strokes than when a new keyframe with no GP Strokes
GP3 Performance drop between keyframes.mp4
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Reference: blender/blender#123317
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