29c6e6c5b2
Implements the "Select Similar" operator for Grease Pencil v3. Several modes are available. Each mode has a dedicated "distance" metric: - layer, material: compared by index - radius, opacity: simple value difference - vertex color: euclidian float4 distance metric The implementation uses a `Set` to find selected values first, then compare each point attribute value to each value in the set until a distance below the threshold is found. This could be optimized by using a KD-Tree in the future. Layer comparison is a special case because points are already separated into drawings by layer, so any drawing in a "selected" layer is becomes fully selected. Co-authored-by: Lukas Tönne <lukas@blender.org> Pull Request: https://projects.blender.org/blender/blender/pulls/111410
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