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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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@ -162,9 +162,13 @@ UV maps and Color Attributes can be retrieved using their name.
Other attributes are listed below: Other attributes are listed below:
``geom:generated`` ``geom:generated``
Generated texture coordinates. Automatically generated texture coordinates, from undeformed mesh.
``geom:uv`` ``geom:uv``
Default render UV map. Default render UV map.
``geom:tangent``
Default tangent vector along surface, in object space.
``geom:undisplaced``
Position before displacement, in object space.
``geom:dupli_generated`` ``geom:dupli_generated``
For instances, generated coordinate from instancer object. For instances, generated coordinate from instancer object.
``geom:dupli_uv`` ``geom:dupli_uv``
@ -177,26 +181,38 @@ Other attributes are listed below:
Vertex coordinates array of the polygon (always three vertices currently). Vertex coordinates array of the polygon (always three vertices currently).
``geom:name`` ``geom:name``
Name of the object. Name of the object.
``geom:is_smooth``
Is mesh face smooth or flat shaded.
``geom:is_curve`` ``geom:is_curve``
Is object a strand or not. Is object a curve or not.
``geom:curve_intercept`` ``geom:curve_intercept``
Point along the strand, from root to tip. 0..1 coordinate for point along the curve, from root to tip.
``geom:curve_thickness`` ``geom:curve_thickness``
Thickness of the strand. Thickness of the curve in object space.
``geom:curve_length``
Length of the curve in object space.
``geom:curve_tangent_normal`` ``geom:curve_tangent_normal``
Tangent Normal of the strand. Tangent Normal of the strand.
``geom:is_point``
Is point in a point cloud or not.
``geom:point_radius``
Radius of point in point cloud.
``geom:point_position``
Center position of point in point cloud.
``geom:point_random``
Random number, different for every point in point cloud.
``path:ray_length`` ``path:ray_length``
Ray distance since last hit. Ray distance since last hit.
``object:random``
Random number, different for every object instance.
``object:index``
Object unique instance index.
``object:location`` ``object:location``
Object location. Object location.
``object:index``
Object index number.
``object:random``
Per object random number generated from object index and name.
``material:index`` ``material:index``
Material index number. Material unique index number.
``particle:index`` ``particle:index``
Particle instance number. Particle unique instance number.
``particle:age`` ``particle:age``
Particle age in frames. Particle age in frames.
``particle:lifetime`` ``particle:lifetime``