I hope y'all are doing good. Not sure if this was discussed before, but I can't find any page online about it. I noticed since Blender 4.3 (never downloaded 4.2), the vertex group for the lineart just doesn't work with the modifiers, and I'm not sure if I'm missing something or just a feature that got removed. The first image is from the latest version of blender 4.5, and the second one is from Goo Engine 4.1.1 
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3 This automatic transfer-weight from object to Grease Pencil (Lineart) , is a feature from Goo Engine.
But, you can replicate this in Blender 4.5 using Geomtry nodes.
This setup consist in transfer and store a Attribute with same name based on surface proximity, i imagine that Goo Engine use same approach but on "backstage"
Make it reusable:
Expose as inputs the Object and Name of vertex group, this make possible that you use same Geometry nodes setup in others GP objects.
For use with Collection
Switch your Object info node for Collection Info node, and add a Realize Instances node beetween this and Sample Nearest Surface.
- $\begingroup$ Thank so much for responding. I've used Goo Engine for so long that I forgot that wasn't a feature in Blender. I do struggle with Geometry nodes, but I managed to replicate what you showed me, and it works amazingly. My only question is, is there a way to use a collection, or combine object info. In Goo Engine for example, just with every separate object having the same name vertex group, they would automatically be affected by that thickness modifier with same vertex group. $\endgroup$Player 2– Player 22025-07-23 15:02:13 +00:00Commented Jul 23 at 15:02
- $\begingroup$ Yes, the Goo engine is amazing and has many features... I edited my answer with adaptations to work with Collection! $\endgroup$Igor Muniz– Igor Muniz2025-07-23 17:11:51 +00:00Commented Jul 23 at 17:11
- 1$\begingroup$ Thank you so much, and it works like charm! Now I feel comfortable using the latest versions of Blender $\endgroup$Player 2– Player 22025-07-23 17:50:25 +00:00Commented Jul 23 at 17:50