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UV: Document pack islands features and new ui #104468

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Chris Blackbourn wants to merge 63 commits from Chris_Blackbourn/blender-manual:uv_pack_islands into blender-v3.6-release
pull from: Chris_Blackbourn/blender-manual:uv_pack_islands
merge into: blender:blender-v3.6-release

When changing the target branch, be careful to rebase the branch in your fork to match. See documentation.
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manual/render/shader_nodes/osl.rst
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@ -157,9 +157,10 @@ Other
Attributes Attributes
========== ==========
Some object, particle and mesh attributes are available to the built-in ``getattribute()`` function. Geometry attributes can be read through the ``getattribute()`` function.
UV maps and Color Attributes can be retrieved using their name. This includes UV maps, color attributes and any attributes output from geometry nodes.
Other attributes are listed below:
The following built-in attributes are available through ``getattribute()`` as well.
``geom:generated`` ``geom:generated``
Automatically generated texture coordinates, from undeformed mesh. Automatically generated texture coordinates, from undeformed mesh.
@ -242,3 +243,16 @@ This function cannot be used instead of lighting;
the main purpose is to allow shaders to "probe" nearby geometry, the main purpose is to allow shaders to "probe" nearby geometry,
for example to apply a projected texture that can be blocked by geometry, for example to apply a projected texture that can be blocked by geometry,
apply more "wear" to exposed geometry, or make other ambient occlusion-like effects. apply more "wear" to exposed geometry, or make other ambient occlusion-like effects.
Metadata
========
Metadata on parameters controls their display in the user interface. The following
metadata is supported:
``[[ string label = "My Label" ]]``
Name of parameter in in the user interface
``[[ string widget = "null" ]]``
Hide parameter in the user interface.
``[[ string widget = "boolean" ]]`` and ``[[ string widget = "checkbox" ]]``
Display integer parameter as a boolean checkbox.