diff options
author | Jacques Lucke <jacques@blender.org> | 2022-09-28 18:54:59 +0300 |
---|---|---|
committer | Jacques Lucke <jacques@blender.org> | 2022-09-28 18:54:59 +0300 |
commit | c55d38f00b8c0e6ae8bda9cc66614afe28fb3fc9 (patch) | |
tree | 0fc280eec3e2d0655197afda823de1062f51ea05 /source/blender/blenkernel/BKE_geometry_fields.hh | |
parent | 2312915b9620808d29e9b20529684800638d5a2a (diff) |
Geometry Nodes: viewport preview
This adds support for showing geometry passed to the Viewer in the 3d
viewport (instead of just in the spreadsheet). The "viewer geometry"
bypasses the group output. So it is not necessary to change the final
output of the node group to be able to see the intermediate geometry.
**Activation and deactivation of a viewer node**
* A viewer node is activated by clicking on it.
* Ctrl+shift+click on any node/socket connects it to the viewer and
makes it active.
* Ctrl+shift+click in empty space deactivates the active viewer.
* When the active viewer is not visible anymore (e.g. another object
is selected, or the current node group is exit), it is deactivated.
* Clicking on the icon in the header of the Viewer node toggles whether
its active or not.
**Pinning**
* The spreadsheet still allows pinning the active viewer as before.
When pinned, the spreadsheet still references the viewer node even
when it becomes inactive.
* The viewport does not support pinning at the moment. It always shows
the active viewer.
**Attribute**
* When a field is linked to the second input of the viewer node it is
displayed as an overlay in the viewport.
* When possible the correct domain for the attribute is determined
automatically. This does not work in all cases. It falls back to the
face corner domain on meshes and the point domain on curves. When
necessary, the domain can be picked manually.
* The spreadsheet now only shows the "Viewer" column for the domain
that is selected in the Viewer node.
* Instance attributes are visualized as a constant color per instance.
**Viewport Options**
* The attribute overlay opacity can be controlled with the "Viewer Node"
setting in the overlays popover.
* A viewport can be configured not to show intermediate viewer-geometry
by disabling the "Viewer Node" option in the "View" menu.
**Implementation Details**
* The "spreadsheet context path" was generalized to a "viewer path" that
is used in more places now.
* The viewer node itself determines the attribute domain, evaluates the
field and stores the result in a `.viewer` attribute.
* A new "viewer attribute' overlay displays the data from the `.viewer`
attribute.
* The ground truth for the active viewer node is stored in the workspace
now. Node editors, spreadsheets and viewports retrieve the active
viewer from there unless they are pinned.
* The depsgraph object iterator has a new "viewer path" setting. When set,
the viewed geometry of the corresponding object is part of the iterator
instead of the final evaluated geometry.
* To support the instance attribute overlay `DupliObject` was extended
to contain the information necessary for drawing the overlay.
* The ctrl+shift+click operator has been refactored so that it can make
existing links to viewers active again.
* The auto-domain-detection in the Viewer node works by checking the
"preferred domain" for every field input. If there is not exactly one
preferred domain, the fallback is used.
Known limitations:
* Loose edges of meshes don't have the attribute overlay. This could be
added separately if necessary.
* Some attributes are hard to visualize as a color directly. For example,
the values might have to be normalized or some should be drawn as arrays.
For now, we encourage users to build node groups that generate appropriate
viewer-geometry. We might include some of that functionality in future versions.
Support for displaying attribute values as text in the viewport is planned as well.
* There seems to be an issue with the attribute overlay for pointclouds on
nvidia gpus, to be investigated.
Differential Revision: https://developer.blender.org/D15954
Diffstat (limited to 'source/blender/blenkernel/BKE_geometry_fields.hh')
-rw-r--r-- | source/blender/blenkernel/BKE_geometry_fields.hh | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_geometry_fields.hh b/source/blender/blenkernel/BKE_geometry_fields.hh index 62aac5a4120..988e0017f04 100644 --- a/source/blender/blenkernel/BKE_geometry_fields.hh +++ b/source/blender/blenkernel/BKE_geometry_fields.hh @@ -145,6 +145,7 @@ class GeometryFieldInput : public fn::FieldInput { ResourceScope &scope) const override; virtual GVArray get_varray_for_context(const GeometryFieldContext &context, IndexMask mask) const = 0; + virtual std::optional<eAttrDomain> preferred_domain(const GeometryComponent &component) const; }; class MeshFieldInput : public fn::FieldInput { @@ -156,6 +157,7 @@ class MeshFieldInput : public fn::FieldInput { virtual GVArray get_varray_for_context(const Mesh &mesh, eAttrDomain domain, IndexMask mask) const = 0; + virtual std::optional<eAttrDomain> preferred_domain(const Mesh &mesh) const; }; class CurvesFieldInput : public fn::FieldInput { @@ -167,6 +169,7 @@ class CurvesFieldInput : public fn::FieldInput { virtual GVArray get_varray_for_context(const CurvesGeometry &curves, eAttrDomain domain, IndexMask mask) const = 0; + virtual std::optional<eAttrDomain> preferred_domain(const CurvesGeometry &curves) const; }; class PointCloudFieldInput : public fn::FieldInput { @@ -218,6 +221,7 @@ class AttributeFieldInput : public GeometryFieldInput { uint64_t hash() const override; bool is_equal_to(const fn::FieldNode &other) const override; + std::optional<eAttrDomain> preferred_domain(const GeometryComponent &component) const override; }; class IDAttributeFieldInput : public GeometryFieldInput { @@ -292,6 +296,7 @@ class AnonymousAttributeFieldInput : public GeometryFieldInput { uint64_t hash() const override; bool is_equal_to(const fn::FieldNode &other) const override; + std::optional<eAttrDomain> preferred_domain(const GeometryComponent &component) const override; }; class CurveLengthFieldInput final : public CurvesFieldInput { @@ -304,4 +309,16 @@ class CurveLengthFieldInput final : public CurvesFieldInput { bool is_equal_to(const fn::FieldNode &other) const override; }; +bool try_capture_field_on_geometry(GeometryComponent &component, + const AttributeIDRef &attribute_id, + const eAttrDomain domain, + const fn::GField &field); + +/** + * Try to find the geometry domain that the field should be evaluated on. If it is not obvious + * which domain is correct, none is returned. + */ +std::optional<eAttrDomain> try_detect_field_domain(const GeometryComponent &component, + const fn::GField &field); + } // namespace blender::bke |