Previously, the data-block dependencies were always detected in
`update_depsgraph` in `MOD_nodes.cc`. This would only be called when something
called `DEG_relations_tag_update` before. We don't want to trigger a depsgraph
rebuild after each operation in the node editor, as that would be expensive.
However, that also meant that we often had to add data-block dependencies that
are not actually used, but might be used if the user changed e.g. a link. A
typical example for that is a object socket that has a default value, but the
socket is also linked.
Now, the dependencies referenced by the node tree are collected by the node tree
update code which runs after all changes. This way we can detect whether the
dependencies have changed. Only if they have changed, a depsgraph rebuild is
triggered. This now allows also taking into account the mute status of nodes and
whether an input is linked.
There are still more things that could be taken into account. Most obviously
whether a node is connected to an output. This can be done later. The most
tricky aspect here is probably that we also have to consider all viewer nodes as
output, because at the time the node runs, it's not known which viewer will
actually be used (which depends on other editors).
This also cleans up some special cases we had for e.g. the scene time node where
we always had to trigger a depsgraph rebuild when it was added/removed because
of its time dependence. This is now part of a more general system.
This fixes#109219.
Pull Request: https://projects.blender.org/blender/blender/pulls/131446
Use StringRefNull for all function arguments and return types.
Not a StringRef but StringRefNull since there is still large
interaction with C api so null-termination usually necessary.
If string is expected to be not only empty but also a null then
optional is used. This change depends on #130935.
Pull Request: https://projects.blender.org/blender/blender/pulls/131204
We weren't handling the failure case of `IDP_AddToGroup` when the
property already exists. Arguably this is a bit bad because we're not
recording the type of the second socket with the same name, but we
don't really have the tools to solve that with IDProperties.
NOTE: This also required some changes to Cycles code itself, who is now
directly including `BKE_image.hh` instead of declaring a few prototypes
of these functions in its `blender/utils.h` header (due to C++ functions
names mangling, this was not working anymore).
Pull Request: https://projects.blender.org/blender/blender/pulls/130174
This refactors the lifetime analysis of anonymous attributes in geometry nodes.
The refactor has a couple of goals:
* Use a better and simpler abstraction that can be used when building the
lazy-function graph. We currently have a bunch of duplicate code to handle
"field source" and "caller propagation" attributes. This is now unified so
that one only has to worry about one kind of "reference sets".
* Make the abstraction compatible with handling bundles and closures in case we
want to support them in the future. Both types can contain geometries and
fields so they need to be taken into account when determining lifetimes.
* Make more parts independent of the concept of "anonymous attributes". In
theory, there could be more kinds of referenced data whose lifetimes need to
be managed. I don't have any concrete plans for adding any though.
At its core, deterministic anonymous attributes still work the same they have
been since they became deterministic [0]. Even the generated lazy-function graph
is still pretty much or even exactly the same as before.
The patch renames `AnonymousAttributeSet` to the more general
`GeometryNodesReferenceSet` which is more. This also makes more places
independent of the concept of anonymous attributes. Functionally, this still the
same though. It's only used in the internals of geometry nodes nowadays. Most
code just gets an `AttributeFilter` that is based on it.
[0]: https://archive.blender.org/developer/D16858
Pull Request: https://projects.blender.org/blender/blender/pulls/128667
This adds a new type of zone to Geometry Nodes that allows executing some nodes
for each element in a geometry.
## Features
* The `Selection` input allows iterating over a subset of elements on the set
domain.
* Fields passed into the input node are available as single values inside of the
zone.
* The input geometry can be split up into separate (completely independent)
geometries for each element (on all domains except face corner).
* New attributes can be created on the input geometry by outputting a single
value from each iteration.
* New geometries can be generated in each iteration.
* All of these geometries are joined to form the final output.
* Attributes from the input geometry are propagated to the output
geometries.
## Evaluation
The evaluation strategy is similar to the one used for repeat zones. Namely, it
dynamically builds a `lazy_function::Graph` once it knows how many iterations
are necessary. It contains a separate node for each iteration. The inputs for
each iteration are hardcoded into the graph. The outputs of each iteration a
passed to a separate lazy-function that reduces all the values down to the final
outputs. This final output can have a huge number of inputs and that is not
ideal for multi-threading yet, but that can still be improved in the future.
## Performance
There is a non-neglilible amount of overhead for each iteration. The overhead is
way larger than the per-element overhead when just doing field evaluation.
Therefore, normal field evaluation should be preferred when possible. That can
partially still be optimized if there is only some number crunching going on in
the zone but that optimization is not implemented yet.
However, processing many small geometries (e.g. each hair of a character
separately) will likely **always be slower** than working on fewer larger
geoemtries. The additional flexibility you get by processing each element
separately comes at the cost that Blender can't optimize the operation as well.
For node groups that need to handle lots of geometry elements, we recommend
trying to design the node setup so that iteration over tiny sub-geometries is
not required.
An opposite point is true as well though. It can be faster to process more
medium sized geometries in parallel than fewer very large geometries because of
more multi-threading opportunities. The exact threshold between tiny, medium and
large geometries depends on a lot of factors though.
Overall, this initial version of the new zone does not implement all
optimization opportunities yet, but the points mentioned above will still hold
true later.
Pull Request: https://projects.blender.org/blender/blender/pulls/127331
Use snake style naming for all the kernel nodes functions.
Omit kernel prefix in the names since of the using namespace.
Use full forms of the terms
('iter' -> 'iterator', 'ntree' -> 'node_tree', 'rem' -> 'remove', ...).
Pull Request: https://projects.blender.org/blender/blender/pulls/126416
This adds the ability to customize the default width of a group node that's
created for a node group. This feature works towards the goal of unifying the
features available to built-in nodes and node groups. We often customize the
width of built-in nodes from them to looks slightly better (e.g. to avoid
cut-off labels).
Pull Request: https://projects.blender.org/blender/blender/pulls/126054
Previously, values for `ID.flag` and `ID.tag` used the prefixes `LIB_` and
`LIB_TAG` respectively. This was somewhat confusing because it's not really
related to libraries in general. This patch changes the prefix to `ID_FLAG_` and
`ID_TAG_`. This makes it more obvious what they correspond to, simplifying code.
Pull Request: https://projects.blender.org/blender/blender/pulls/125811
`BLO_read_data_address` should basically almost never be used. However,
this code is not trivial to update, and it has an active team working on
it, so for now just tagging the issue there.
This commit moves generated `RNA_blender.h`, `RNA_prototype.h` and
`RNA_blender_cpp.h` headers to become C++ header files.
It also removes the now useless `RNA_EXTERN_C` defines, and just
directly use the `extern` keyword. We do not need anymore `extern "C"`
declarations here.
Pull Request: https://projects.blender.org/blender/blender/pulls/124469
This adds support for attaching gizmos for input values. The goal is to make it
easier for users to set input values intuitively in the 3D viewport.
We went through multiple different possible designs until we settled on the one
implemented here. We picked it for it's flexibility and ease of use when using
geometry node assets. The core principle in the design is that **gizmos are
attached to existing input values instead of being the input value themselves**.
This actually fits the existing concept of gizmos in Blender well, but may be a
bit unintutitive in a node setup at first. The attachment is done using links in
the node editor.
The most basic usage of the node is to link a Value node to the new Linear Gizmo
node. This attaches the gizmo to the input value and allows you to change it
from the 3D view. The attachment is indicated by the gizmo icon in the sockets
which are controlled by a gizmo as well as the back-link (notice the double
link) when the gizmo is active.
The core principle makes it straight forward to control the same node setup from
the 3D view with gizmos, or by manually changing input values, or by driving the
input values procedurally.
If the input value is controlled indirectly by other inputs, it's often possible
to **automatically propagate** the gizmo to the actual input.
Backpropagation does not work for all nodes, although more nodes can be
supported over time.
This patch adds the first three gizmo nodes which cover common use cases:
* **Linear Gizmo**: Creates a gizmo that controls a float or integer value using
a linear movement of e.g. an arrow in the 3D viewport.
* **Dial Gizmo**: Creates a circular gizmo in the 3D viewport that can be
rotated to change the attached angle input.
* **Transform Gizmo**: Creates a simple gizmo for location, rotation and scale.
In the future, more built-in gizmos and potentially the ability for custom
gizmos could be added.
All gizmo nodes have a **Transform** geometry output. Using it is optional but
it is recommended when the gizmo is used to control inputs that affect a
geometry. When it is used, Blender will automatically transform the gizmos
together with the geometry that they control. To achieve this, the output should
be merged with the generated geometry using the *Join Geometry* node. The data
contained in *Transform* output is not visible geometry, but just internal
information that helps Blender to give a better user experience when using
gizmos.
The gizmo nodes have a multi-input socket. This allows **controlling multiple
values** with the same gizmo.
Only a small set of **gizmo shapes** is supported initially. It might be
extended in the future but one goal is to give the gizmos used by different node
group assets a familiar look and feel. A similar constraint exists for
**colors**. Currently, one can choose from a fixed set of colors which can be
modified in the theme settings.
The set of **visible gizmos** is determined by a multiple factors because it's
not really feasible to show all possible gizmos at all times. To see any of the
geometry nodes gizmos, the "Active Modifier" option has to be enabled in the
"Viewport Gizmos" popover. Then all gizmos are drawn for which at least one of
the following is true:
* The gizmo controls an input of the active modifier of the active object.
* The gizmo controls a value in a selected node in an open node editor.
* The gizmo controls a pinned value in an open node editor. Pinning works by
clicking the gizmo icon next to the value.
Pull Request: https://projects.blender.org/blender/blender/pulls/112677
Also see 06be295946.
These aren't all cases, but a few that I found by addding a static
assert in `MEM_new` so that it fails for trivially constructible types.
The current temperature unit adjusts to Celsius or Fahrenheit based on
unit system, but specifically for color temperatures the convention is
to display them in Kelvin, and it'd be strange to e.g. see 11240°F when
opening the white balance panel.
Therefore, this adds a dedicated Color Temperature unit, and uses it
for the two existing blackbody temperature inputs in shader nodes.
Pull Request: https://projects.blender.org/blender/blender/pulls/123337
By capturing multiple attributes with one node, the user can make sure that those
are evaluated together in the same context. This can be quite a bit more efficient
compared to capturing multiple fields separately (also because we don't optimize
grouping multiple capture nodes together yet).
The change is fully backward compatible. Forward compatibility has been added
for some cases. Especially, files created in older versions that are saved with this
newer version will still work in the older version.
Co-authored-by: Hans Goudey <hans@blender.org>
Pull Request: https://projects.blender.org/blender/blender/pulls/121665
Move all header file into namespace.
Unnecessary namespaces was removed from implementations file.
Part of forward declarations in header was moved in the top part
of file just to do not have a lot of separate namespaces.
Pull Request: https://projects.blender.org/blender/blender/pulls/121637
This allows node groups to have a description that is shown in the add menu
or when hovering over the node header.
This new description is stored in `bNodeTree.description`. Unfortunately, it
conflicts a bit with `ID.asset_data.description`. The difference is that the latter
only exists for assets. However, it makes sense for node groups to have
descriptions even if they are not assets (just like `static` functions in C++ should
also be able to have comments). In some cases, node groups are also generated
by addons for a specific purpose. Those should still have a description without
being reusable to make it easier to understand for users.
The solution here is to use the asset description if the node group is an asset,
and to use `bNodeTree.description` otherwise. The description is synced
automatically when marking or clearing assets.
A side benefit of this solution is that appended node group assets can keep their
description, which is currently always lost.
Pull Request: https://projects.blender.org/blender/blender/pulls/121334
Advanced ID copying code can now take a `new_owner_id` ID pointer parameter,
and use it to set the relevant 'loopback' pointer to its owner ID by the
copy code itself.
Besides avoiding the need for all code copying embedded IDs to set the
loopback pointer themselves, this also means that `lib_id` copying code
itself does not need to use `IDWALK_IGNORE_MISSING_OWNER_ID` anymore.
This change is not expected to have any effect in current codebase.
While currently, all cases where `BKE_id_owner_get` is called are
'safe', there are some points in code where the pointers ensureing the
relationship between an embedded ID and its owner are not (fully) valid.
This new option (`false` by default) allows to skip the debug asserts
ensuring the sanity of these 'owner <-> embedded' ID pointers in the
relevant `owner_pointer_get` callbacks.
This change is not expected to have any effect in current codebase.
This changes the menu switch socket to use the socket-items system
(`NOD_socket_items.hh`) that is already used by the simulation zone, repeat
zone, bake node and index switch node. By using this system, the per-node
boilerplate can be removed significantly. This is especially important as we
plan to have dynamic socket amounts in more nodes in the future.
There are some user visible changes which make the node more consistent with
others:
* Move the menu items list into the properties panel as in 0c585a1b8a.
* Add an extend socket.
* Duplicating a menu item keeps the name of the old one.
There is also a (backward compatible) change in the Python API: It's now
possible to directly access `node.enum_items` and `node.active_index` instead of
having to use `node.enum_definition.enum_items`. This is consistent with the
other nodes. For backward compatibility, `node.enum_definition` still exists,
but simply returns the node itself.
Many API functions from `NodeEnumDefinition` like
`NodeEnumDefinition::remove_item` have been removed. Those are not used anymore
and are unnecessary boilerplate. If ever necessary, they can be implemented back
in terms of the socket-items system.
The socket-items system had to be extended a little bit to support the case for
the menu switch node where each socket item has a name but no type. Previously,
there was the case without name and type in the index switch node, and the case
with both in the bake node and zones. The system was trivial to extend to this
case.
Pull Request: https://projects.blender.org/blender/blender/pulls/121234
The idea is to allow iterating over e.g. all ID usages of a node from a
whole nodetree, using the same generic handling as existing 'whole ID'
`foreach_id` code.
This is necessary in some cases wher a sub-data needs to processed
independently from any 'owner ID', e.g. in some copy/paste handling.
This is a pre-requirement for proper fix of nodes copy/paste (see
e.g. #120103).
Pull Request: https://projects.blender.org/blender/blender/pulls/121018
This makes the read and write API functions match more closely, and adds
asserts to check that the data size is as expected.
There are still a few places remaining that use BLO_read_data_address
and similar generic functions, these should eventually be replaced as well.
Pull Request: https://projects.blender.org/blender/blender/pulls/120994
`NOD_zone_socket_items.hh` contained code for different nodes. It's better to
split this into headers per node, because that scales better. Also it helps to
keep the code for each individual node more closely together.
Pull Request: https://projects.blender.org/blender/blender/pulls/120945
To know if link is connected to dangling reroute and can be skipped
as value-less, we need to know if reroute is dangling. This requires
graph traversal. Currently this is done by non-recursive iteration.
But this can lead quadratic complexity for some of the cases.
Other way is to make this linear while cache building.
Pull Request: https://projects.blender.org/blender/blender/pulls/120375
#114401 added forward compatibility code to remove unsupported socket
types and avoid crashing with unknown default_value data. However, this
did not update link pointers (which haven't been read at that point),
so the tree can end up with dangling pointers.
To fix this, removal of unsupported sockets is moved further back to a
point where links have been read and can be fixed accordingly.
Ported to main from #119630
Pull Request: https://projects.blender.org/blender/blender/pulls/119650
We already expose two other types that don't have a directly
corresponding socket type-- float2 and byte colors. This also solves
the inability to write to the nurbs_order attribute in geometry nodes.
Fixes#119843
Pull Request: https://projects.blender.org/blender/blender/pulls/119879
For historical reasons, the `multi_input_socket_index` was actually reversed
(large index comes first). This patch renames it to `multi_input_sort_id` and
adds a comment. This new name makes it less confusing that the id is reversed.
Pull Request: https://projects.blender.org/blender/blender/pulls/119652
