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Existing Nodes that should work with Grease Pencil geometry

Attributes

  • Attribute Statistic
    • Only layer domain
  • Domain Size
    • Only layer domain -> output number of layers
  • Capture Attribute
    • Only layer domain
  • Remove/Store Named Attribure
    • On layer domaiAn

Geometry

  • Geometry to Instance
  • Join Geometry

Geometry Read

  • ID
  • Index
  • Named Attribute

Geometry Write

  • Set ID
  • Set Position

Geometry Operations

  • Bounding Box
  • Convex Hull
  • Delete Geometry
  • Duplicate Elements
    • Might be trickier because we need to add new layers
  • Merge by Distance
  • Transform
  • Seperate Geometry
    • Might be trickier because we need to split the grease pencil layer tree
  • Seperate Components

Curve Read

  • Curve Length
    • total length of all splines across all layers
  • Curve Tangent
  • Endpoint Selection
  • Is Spline Cyclic
  • Spline Length/Parameter/Resolution

Curve Sample

  • Sample Curve
    • Issue: We can't have a curve index field across layers

Curve Write

  • Set Curve Radius
    • Selection: propagate layer selection down to points
  • Set Spline Cyclic
  • Set Spline Resolution

Curve Operations

  • Curve to Mesh
  • Curve to Points
  • Deform Curves on Surface
    • ?
  • Fill Curve
  • Fillet Curve
  • Interpolate Curves
    • ?
  • Resample Curve
  • Reverse Curve
  • Subdivide Curve
  • Trim Curve

Material

  • Replace Material
  • Material Index
  • Material Selection
  • Set Material
  • Set Material Index
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Falk
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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
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
Geometry Nodes Grease Pencil Integration Proposal

A grease pencil layer is represented as a curve instance.Layer data is stored on the instance domain. The output of the modifier is a InstancesComponent from which the (flat) list of layers is reconstructed. Some data like the visibility is important because it needs to be read for rendering. Others are not so important (like a layer being locked, which is only important for editing). All the curve nodes like "Trim Curve" should still work for instances. So they could also work for the GP layers. We can add a subtype for grease pencil layer (-group)s. Internally it is an integer reffering to the instance ID. Can be exposed as a dropdown list in the modifier UI. That way it is easy to select a particular layer to run the nodes on.

Jun 5, 2023
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