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< h1 id = "attributes" > < a class = "header" href = "#attributes" > Attributes< / a > < / h1 >
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< p > An important concept in Geometry Nodes is attributes. Many trees capture attributes or transfer them from one domain to another.< / p >
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< p > When using these methods, the < code > data_type< / code > argument must be correctly specified for the transfer to work as intended.< / p >
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< pre > < code class = "language-python" > @tree(" Skin" )
def skin():
# Create a cube
c = cube()
# Create a sphere
sphere = uv_sphere()
# Transfer the position to the sphere
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transferred_position = c.transfer_attribute(
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data_type=TransferAttribute.DataType.FLOAT_VECTOR,
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attribute=position()
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)
# Make the sphere conform to the shape of the cube
return sphere.set_position(position=transferred_position)
< / code > < / pre >
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< p > To improve the usability of these nodes, < code > capture(...)< / code > and < code > transfer(...)< / code > methods are provided on < code > Geometry< / code > that simply take the attribute and any other optional arguments.< / p >
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< pre > < code class = "language-python" > @tree(" Skin" )
def skin():
# Create a cube
c = cube()
# Create a sphere
sphere = uv_sphere()
# Make the sphere conform to the shape of the cube
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return sphere.set_position(position=c.transfer(position()))
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< / code > < / pre >
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< p > The same is available for < code > capture(...)< / code > .< / p >
< pre > < code class = "language-python" > geometry_with_attribute, attribute = c.capture(position())
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< / code > < / pre >
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< blockquote >
< p > You must use the < code > Geometry< / code > returned from < code > capture(...)< / code > for the anonymous attribute it creates to be usable.< / p >
< / blockquote >
< p > Any additional keyword arguments can be passed as normal.< / p >
< pre > < code class = "language-python" > c.transfer(position(), mapping=TransferAttribute.Mapping.INDEX)
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< / code > < / pre >
< h2 id = "named-attributes" > < a class = "header" href = "#named-attributes" > Named Attributes< / a > < / h2 >
< p > Custom attributes can be created by name.
The safest way to use named attributes is with the < code > Attribute< / code > class.< / p >
< p > Create a named attribute with a data type and optional domain, then use the < code > store(...)< / code > , < code > exists()< / code > , and < code > __call__(...)< / code > methods to use it.< / p >
< pre > < code class = "language-python" > # Create the attribute
my_custom_attribute = Attribute(
" my_custom_attribute" ,
NamedAttribute.DataType.FLOAT, # declare the data type once
StoreNamedAttribute.Domain.INSTANCE # optional
)
# Store a value
geometry = my_custom_attribute.store(geometry, 0.5)
# Use the value by calling the attribute
geometry = geometry.set_position(offset=my_custom_attribute())
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< / code > < / pre >
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< h2 id = "attribute-sampling" > < a class = "header" href = "#attribute-sampling" > Attribute Sampling< / a > < / h2 >
< p > In Blender 3.4+, transfer attribute was replaced with a few separate nodes: < em > Sample Index< / em > , < em > Sample Nearest< / em > , and < em > Sample Nearest Surface< / em > .< / p >
< p > To avoid inputting data types and geometry manually, you can use the custom < code > Geometry< / code > subscript.< / p >
< p > The structure for these subscripts is:< / p >
< pre > < code class = "language-python" > geometry[value : index or sample position : domain, mode, domain]
< / code > < / pre >
< p > Only the value argument is required. Other arguments can be supplied as needed.< / p >
< pre > < code class = "language-python" > geometry[value]
geometry[value : sample_position, SampleMode.NEAREST]
geometry[value : index() + 1 : SampleIndex.Domain.EDGE]
< / code > < / pre >
< p > Try passing different arguments and see how the resulting nodes are created.< / p >
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