This will allow retrieving the instance groups from multiple geometry
sets and avoiding needing vectors of vectors to store the results.
This is useful when retrieving instances from a multi-input socket
of geometries.
Previously even if the input goemetry set had no point cloud or no mesh
instances, `geometry_set_realize_instances` would create empty data.
This isn't necessarily bad, but it can complicate things down the line if
there are a bunch of empty components getting passed around.
This exposes the `crease` attribute, that is used by the Subdivide Smooth node.
It is also the first attribute on the edge domain. Domain interpolations for the
edge domain have not been implemented yet.
Ref T86397.
Differential Revision: https://developer.blender.org/D10660
This commit adds a `normal` attribute on the polygon domain. Since
normal data is derived data purely based off of the location of each
face's vertices, it is exposed as a read-only attribute. After
rB80f7f1070f17, this attribute can be interpolated to the other domains.
Since this attribute is a special case compared to the others, the
implementation subclasses `BuiltinAttributeProvider`. It's possible
there is a better way to abstract this. Something else might also
become apparent if we add similar read-only attributes.
See rB2966871a7a891bf36 for why this is preferred over the previous
implementation.
Differential Revision: https://developer.blender.org/D10677
This patch exposes the "Shade Smooth" value as a boolean attribute.
This setting is exposed as a check-box in the mesh data properties,
but the value is actually stored for every face, allowing some faces
to be shaded smooth with a simple per-face control.
One bonus, this allows at least a workaround to the lack of control
of whether meshes created by nodes are shaded smooth or not: just use
an attribute fill node.
Differential Revision: https://developer.blender.org/D10538
This attribute exposes mesh vertex normals as a `vertex_normal`
attribute for use with nodes. Since the normal vector stored in
vertices is only a cache of data computable from the surrounding faces,
the attribute is read-only. A proper error message for attempting to
write this attribute is part of T85749. A write-only normal attribute
will likely come later, most likely called `corner_normal`.
The normals are recomputed before reading if they are marked dirty.
This involves const write-access to the mesh, protected by the mutex
stored in `Mesh_Runtime`. This is essential for correct behavior after
nodes like "Edge Split" or nodes that adjust the position attribute.
Ref T84297, T85880, T86206
Differential Revision: https://developer.blender.org/D10541
This allows accessing attribute meta data like domain and data type
without having to create a `ReadAttribute`. I kept the `attribute_names`
method for now to keep the patch more self contained.
Differential Revision: https://developer.blender.org/D10511
"Kind" is a bit less generic than "Info" for me. Especially, it implies
that the struct does not contain the name of a specific attribute
(for me anyway).
Previously, when a Geometry Nodes modifier outputs a point cloud
(e.g. generated using the Point Distribute node), other modifiers
could not use that data. Now, the point cloud data is converted to
mesh vertices for such modifiers.
Ref T85281.
Differential Revision: https://developer.blender.org/D10451
The `material_index` attribute can adjust which material in the list
will be applied to each face of the mesh. There are two new things
about this attribute that haven't been exposed by the attribute API yet.
Each comes with limitations:
1. Integer data type: Most attribute nodes are currently written to use
float data types. This means that they can't write to this attribute
because they can't change the type of a built-in attribute.
2. Polygon domain: This is our first attribute using the polygon domain,
meaning until some of the interpolations are implemented, some
operations may not work as expected.
Currently the two nodes that work with this attribute are Attribute Fill
and Attribute Randomize.
Differential Revision: https://developer.blender.org/D10444
In an upcoming commit I'll also move the make-instances-real functionality
to this file. This code is not essential to working with geometry sets in general,
so it makes sense to move it to a separate header.
