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Geometry Nodes Grease Pencil integration design

This document summarizes the ideas for how to integrate Grease Pencil into geometry nodes.

The Grease Pencil data-block at a specific scene frame can be thought of as a tree of CurvesGeometry.

GreasePencil
Group1
Layer2
Layer3
Group2
Layer4
Layer5
Layer1
CurvesGeometry1
CurvesGeometry2
CurvesGeometry3
CurvesGeometry4
CurvesGeometry5

Idea #1

  • New Geometry Component for Grease Pencil
  • Two nodes
    • Convert Grease Pencil to Curves
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      • If the layer name is empty, will convert all the visible curves to a single CurvesGeometry
      • If there is a valid layer name, will only convert the CurvesGeometry of that layer.
    • Convert Curves to Grease Pencil
      • Problem: How to we reconstruct the layer tree?
        • Idea: Store a layer_id and a parent_layer_id attribute on each curve. Reconstruct the tree from this information. This will reconstruct the structure, but looses all information stored on the layers. E.g. visibility, name, etc
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Grease Pencil Rendering Meeting

Is there a good reason for having a separate renderer for Grease Pencil ? Is this to the question “how do we do NPR rendering in Blender” ?

Dec 4, 2023
Existing Nodes that should work with Grease Pencil geometry

Attribute Statistic

Sep 19, 2023
Grease Pencil Eraser

Go through all the curves and check each segment for intersections with the eraser (circle)

Jul 10, 2023
Grease Pencil Dopesheet Meeting

Mockup of keyframes in Grease Pencil 3.0 GP Keyframes are not a single point in time. They start, are held for 1 or more frames and then end. Is "Keyframe" even the right word? (Static? Block? Discrete?) Cel!Probably needs its own eAnim_KeyType. In general: how do we deal with animation channels that do not have (or cannot be represented by) an FCurve? What about Annotations? Plan is to keep using the current grease pencil data-block (bGPdata). Could be moved to their own Dopesheet maybe?

Jun 8, 2023
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