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Constraint: Geometry Attribute

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Add a new constraint called "Geometry Attribute", which directly
samples vector, quaternion, or 4x4 matrix attributes from geometry and
applies these to an object's or bone's transform.

This can be used to transfer data generated by geometry nodes to the
object or bone level. By default the constraint will sample a vector
on the vertex domain. The default attribute is `position` for
simplicity, but the attribute value does not have to have anything to
do with neither the transform of the geometry object nor the geometry
itself.

Pull Request: https://projects.blender.org/blender/blender/pulls/136477
This commit is contained in:
Cartesian Caramel
2025-10-07 15:14:22 +02:00
committed by Sybren A. Stüvel
parent e2872c0bfe
commit 8f41d46d74
11 changed files with 676 additions and 2 deletions
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39
tests/python/bl_constraints.py
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@@ -502,6 +502,45 @@ class ActionConstraintTest(AbstractConstraintTests):
)))
class GeometryAttributeConstraintTest(AbstractConstraintTests):
layer_collection = "Geometry Attribute"
def test_mix_modes(self):
owner = bpy.context.scene.objects["Geometry Attribute.owner"]
con = owner.constraints["Geometry Attribute"]
con.apply_target_transform = False
# This should produce the matrix as stored in the geometry attribute.
con.mix_mode = 'REPLACE'
self.matrix_test(owner.name, Matrix(
((0.32139378786087036, -0.41721203923225403, 0.8500824570655823, -1.0),
(0.5566704273223877, 0.809456467628479, 0.18681080639362335, -1.0),
(-0.7660444378852844, 0.41317591071128845, 0.49240389466285706, 0.0),
(0.0, 0.0, 0.0, 1.0))),
)
con.mix_mode = 'BEFORE_SPLIT'
self.matrix_test(owner.name, Matrix(
((0.32139378786087036, -0.41721203923225403, 0.8500824570655823, -0.8999999761581421),
(0.5566704273223877, 0.809456467628479, 0.18681080639362335, -0.800000011920929),
(-0.7660444378852844, 0.41317591071128845, 0.49240389466285706, 0.30000001192092896),
(0.0, 0.0, 0.0, 1.0))),
)
def test_apply_target_transform(self):
owner = bpy.context.scene.objects["Geometry Attribute.owner"]
con = owner.constraints["Geometry Attribute"]
con.apply_target_transform = True
con.mix_mode = 'REPLACE'
self.matrix_test(owner.name, Matrix(
((0.5681133270263672, -0.2360532432794571, 0.788369357585907, -0.923704206943512),
(0.3527687191963196, 0.9353533983230591, 0.02585163712501526, -0.5034461617469788),
(-0.7435062527656555, 0.26342537999153137, 0.6146588921546936, 0.012183472514152527),
(0.0, 0.0, 0.0, 1.0))),
)
def main():
global args
import argparse