diff options
author | Hans Goudey <h.goudey@me.com> | 2021-10-26 23:40:57 +0300 |
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committer | Hans Goudey <h.goudey@me.com> | 2021-10-26 23:40:57 +0300 |
commit | 7d3d09b69c0af677bd363cc009f37fdd1e4a7185 (patch) | |
tree | 4aba7d488037399f3ac9756da1a2aa23b58d38f2 /source/blender/nodes/geometry | |
parent | b37caa3f06440c3dd36c749950e50becfbddf2e8 (diff) |
Geometry Nodes: Get and set nodes for ID attribute
These nodes allow accessing and changing the stable/random ID used
for motion blur with instances and stable randomness.
Since rB40c3b8836b7a, the stable ID is a built-in attribute, so to be
consistent and allow changing it in the node tree like other built-in
attributes, it has get and set nodes.
Diffstat (limited to 'source/blender/nodes/geometry')
-rw-r--r-- | source/blender/nodes/geometry/nodes/node_geo_input_id.cc | 42 | ||||
-rw-r--r-- | source/blender/nodes/geometry/nodes/node_geo_set_id.cc | 94 |
2 files changed, 136 insertions, 0 deletions
diff --git a/source/blender/nodes/geometry/nodes/node_geo_input_id.cc b/source/blender/nodes/geometry/nodes/node_geo_input_id.cc new file mode 100644 index 00000000000..049dbf06d80 --- /dev/null +++ b/source/blender/nodes/geometry/nodes/node_geo_input_id.cc @@ -0,0 +1,42 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include "node_geometry_util.hh" + +namespace blender::nodes { + +static void geo_node_input_id_declare(NodeDeclarationBuilder &b) +{ + b.add_output<decl::Int>("ID").field_source(); +} + +static void geo_node_input_id_exec(GeoNodeExecParams params) +{ + Field<int> position_field{AttributeFieldInput::Create<int>("id")}; + params.set_output("ID", std::move(position_field)); +} + +} // namespace blender::nodes + +void register_node_type_geo_input_id() +{ + static bNodeType ntype; + + geo_node_type_base(&ntype, GEO_NODE_INPUT_ID, "ID", NODE_CLASS_INPUT, 0); + ntype.geometry_node_execute = blender::nodes::geo_node_input_id_exec; + ntype.declare = blender::nodes::geo_node_input_id_declare; + nodeRegisterType(&ntype); +} diff --git a/source/blender/nodes/geometry/nodes/node_geo_set_id.cc b/source/blender/nodes/geometry/nodes/node_geo_set_id.cc new file mode 100644 index 00000000000..f8edfa145d9 --- /dev/null +++ b/source/blender/nodes/geometry/nodes/node_geo_set_id.cc @@ -0,0 +1,94 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include "node_geometry_util.hh" + +namespace blender::nodes { + +static void geo_node_set_id_declare(NodeDeclarationBuilder &b) +{ + b.add_input<decl::Geometry>("Geometry"); + b.add_input<decl::Bool>("Selection").default_value(true).hide_value().supports_field(); + b.add_input<decl::Int>("ID").supports_field(); + b.add_output<decl::Geometry>("Geometry"); +} + +static void set_id_in_component(GeometryComponent &component, + const Field<bool> &selection_field, + const Field<int> &id_field) +{ + GeometryComponentFieldContext field_context{component, ATTR_DOMAIN_POINT}; + const int domain_size = component.attribute_domain_size(ATTR_DOMAIN_POINT); + if (domain_size == 0) { + return; + } + + fn::FieldEvaluator selection_evaluator{field_context, domain_size}; + selection_evaluator.add(selection_field); + selection_evaluator.evaluate(); + const IndexMask selection = selection_evaluator.get_evaluated_as_mask(0); + + /* Since adding the ID attribute can change the result of the field evaluation (the random value + * node uses the index if the ID is unavailable), make sure that it isn't added before evaluating + * the field. However, as an optimization, use a faster code path when it already exists. */ + fn::FieldEvaluator id_evaluator{field_context, &selection}; + if (component.attribute_exists("id")) { + OutputAttribute_Typed<int> id_attribute = component.attribute_try_get_for_output_only<int>( + "id", ATTR_DOMAIN_POINT); + id_evaluator.add_with_destination(id_field, id_attribute.varray()); + id_evaluator.evaluate(); + id_attribute.save(); + } + else { + id_evaluator.add(id_field); + id_evaluator.evaluate(); + const VArray<int> &result_ids = id_evaluator.get_evaluated<int>(0); + OutputAttribute_Typed<int> id_attribute = component.attribute_try_get_for_output_only<int>( + "id", ATTR_DOMAIN_POINT); + result_ids.materialize(selection, id_attribute.as_span()); + id_attribute.save(); + } +} + +static void geo_node_set_id_exec(GeoNodeExecParams params) +{ + GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry"); + Field<bool> selection_field = params.extract_input<Field<bool>>("Selection"); + Field<int> id_field = params.extract_input<Field<int>>("ID"); + + for (const GeometryComponentType type : {GEO_COMPONENT_TYPE_INSTANCES, + GEO_COMPONENT_TYPE_MESH, + GEO_COMPONENT_TYPE_POINT_CLOUD, + GEO_COMPONENT_TYPE_CURVE}) { + if (geometry_set.has(type)) { + set_id_in_component(geometry_set.get_component_for_write(type), selection_field, id_field); + } + } + + params.set_output("Geometry", std::move(geometry_set)); +} + +} // namespace blender::nodes + +void register_node_type_geo_set_id() +{ + static bNodeType ntype; + + geo_node_type_base(&ntype, GEO_NODE_SET_ID, "Set ID", NODE_CLASS_GEOMETRY, 0); + ntype.geometry_node_execute = blender::nodes::geo_node_set_id_exec; + ntype.declare = blender::nodes::geo_node_set_id_declare; + nodeRegisterType(&ntype); +} |