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/*
* 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 "DNA_collection_types.h"
#include "BLI_hash.h"
#include "BLI_task.hh"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_instance_on_points_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Points")).description(N_("Points to instance on"));
b.add_input<decl::Bool>(N_("Selection")).default_value(true).supports_field().hide_value();
b.add_input<decl::Geometry>(N_("Instance"))
.description(N_("Geometry that is instanced on the points"));
b.add_input<decl::Bool>(N_("Pick Instance"))
.supports_field()
.description("Place different instances on different points");
b.add_input<decl::Int>(N_("Instance Index"))
.implicit_field()
.description(N_(
"Index of the instance that used for each point. This is only used when Pick Instances "
"is on. By default the point index is used"));
b.add_input<decl::Vector>(N_("Rotation"))
.subtype(PROP_EULER)
.supports_field()
.description(N_("Rotation of the instances"));
b.add_input<decl::Vector>(N_("Scale"))
.default_value({1.0f, 1.0f, 1.0f})
.subtype(PROP_XYZ)
.supports_field()
.description(N_("Scale of the instances"));
b.add_output<decl::Geometry>(N_("Instances"));
}
static void add_instances_from_component(InstancesComponent &dst_component,
const GeometryComponent &src_component,
const GeometrySet &instance,
const GeoNodeExecParams ¶ms)
{
const AttributeDomain domain = ATTR_DOMAIN_POINT;
const int domain_size = src_component.attribute_domain_size(domain);
GeometryComponentFieldContext field_context{src_component, domain};
const Field<bool> selection_field = params.get_input<Field<bool>>("Selection");
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);
/* The initial size of the component might be non-zero when this function is called for multiple
* component types. */
const int start_len = dst_component.instances_amount();
const int select_len = selection.index_range().size();
dst_component.resize(start_len + select_len);
MutableSpan<int> dst_handles = dst_component.instance_reference_handles().slice(start_len,
select_len);
MutableSpan<float4x4> dst_transforms = dst_component.instance_transforms().slice(start_len,
select_len);
FieldEvaluator field_evaluator{field_context, domain_size};
VArray<bool> pick_instance;
VArray<int> indices;
VArray<float3> rotations;
VArray<float3> scales;
/* The evaluator could use the component's stable IDs as a destination directly, but only the
* selected indices should be copied. */
field_evaluator.add(params.get_input<Field<bool>>("Pick Instance"), &pick_instance);
field_evaluator.add(params.get_input<Field<int>>("Instance Index"), &indices);
field_evaluator.add(params.get_input<Field<float3>>("Rotation"), &rotations);
field_evaluator.add(params.get_input<Field<float3>>("Scale"), &scales);
field_evaluator.evaluate();
VArray<float3> positions = src_component.attribute_get_for_read<float3>(
"position", domain, {0, 0, 0});
const InstancesComponent *src_instances = instance.get_component_for_read<InstancesComponent>();
/* Maps handles from the source instances to handles on the new instance. */
Array<int> handle_mapping;
/* Only fill #handle_mapping when it may be used below. */
if (src_instances != nullptr &&
(!pick_instance.is_single() || pick_instance.get_internal_single())) {
Span<InstanceReference> src_references = src_instances->references();
handle_mapping.reinitialize(src_references.size());
for (const int src_instance_handle : src_references.index_range()) {
const InstanceReference &reference = src_references[src_instance_handle];
const int dst_instance_handle = dst_component.add_reference(reference);
handle_mapping[src_instance_handle] = dst_instance_handle;
}
}
const int full_instance_handle = dst_component.add_reference(instance);
/* Add this reference last, because it is the most likely one to be removed later on. */
const int empty_reference_handle = dst_component.add_reference(InstanceReference());
threading::parallel_for(selection.index_range(), 1024, [&](IndexRange selection_range) {
for (const int range_i : selection_range) {
const int64_t i = selection[range_i];
/* Compute base transform for every instances. */
float4x4 &dst_transform = dst_transforms[range_i];
dst_transform = float4x4::from_loc_eul_scale(positions[i], rotations[i], scales[i]);
/* Reference that will be used by this new instance. */
int dst_handle = empty_reference_handle;
const bool use_individual_instance = pick_instance[i];
if (use_individual_instance) {
if (src_instances != nullptr) {
const int src_instances_amount = src_instances->instances_amount();
const int original_index = indices[i];
/* Use #mod_i instead of `%` to get the desirable wrap around behavior where -1
* refers to the last element. */
const int index = mod_i(original_index, std::max(src_instances_amount, 1));
if (index < src_instances_amount) {
/* Get the reference to the source instance. */
const int src_handle = src_instances->instance_reference_handles()[index];
dst_handle = handle_mapping[src_handle];
/* Take transforms of the source instance into account. */
mul_m4_m4_post(dst_transform.values,
src_instances->instance_transforms()[index].values);
}
}
}
else {
/* Use entire source geometry as instance. */
dst_handle = full_instance_handle;
}
/* Set properties of new instance. */
dst_handles[range_i] = dst_handle;
}
});
VArray<int> ids = src_component
.attribute_try_get_for_read("id", ATTR_DOMAIN_POINT, CD_PROP_INT32)
.typed<int>();
if (ids) {
VArray_Span<int> ids_span{ids};
MutableSpan<int> dst_ids = dst_component.instance_ids_ensure();
for (const int64_t i : selection.index_range()) {
dst_ids[i] = ids_span[selection[i]];
}
}
if (pick_instance.is_single()) {
if (pick_instance.get_internal_single()) {
if (instance.has_realized_data()) {
params.error_message_add(
NodeWarningType::Info,
TIP_("Realized geometry is not used when pick instances is true"));
}
}
}
}
static void node_geo_exec(GeoNodeExecParams params)
{
GeometrySet geometry_set = params.extract_input<GeometrySet>("Points");
GeometrySet instance = params.get_input<GeometrySet>("Instance");
instance.ensure_owns_direct_data();
geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
InstancesComponent &instances = geometry_set.get_component_for_write<InstancesComponent>();
if (geometry_set.has<MeshComponent>()) {
add_instances_from_component(
instances, *geometry_set.get_component_for_read<MeshComponent>(), instance, params);
geometry_set.remove(GEO_COMPONENT_TYPE_MESH);
}
if (geometry_set.has<PointCloudComponent>()) {
add_instances_from_component(instances,
*geometry_set.get_component_for_read<PointCloudComponent>(),
instance,
params);
geometry_set.remove(GEO_COMPONENT_TYPE_POINT_CLOUD);
}
if (geometry_set.has<CurveComponent>()) {
add_instances_from_component(
instances, *geometry_set.get_component_for_read<CurveComponent>(), instance, params);
geometry_set.remove(GEO_COMPONENT_TYPE_CURVE);
}
});
/* Unused references may have been added above. Remove those now so that other nodes don't
* process them needlessly.
* This should eventually be moved into the loop above, but currently this is quite tricky
* because it might remove references that the loop still wants to iterate over. */
InstancesComponent &instances = geometry_set.get_component_for_write<InstancesComponent>();
instances.remove_unused_references();
params.set_output("Instances", std::move(geometry_set));
}
} // namespace blender::nodes::node_geo_instance_on_points_cc
void register_node_type_geo_instance_on_points()
{
namespace file_ns = blender::nodes::node_geo_instance_on_points_cc;
static bNodeType ntype;
geo_node_type_base(
&ntype, GEO_NODE_INSTANCE_ON_POINTS, "Instance on Points", NODE_CLASS_GEOMETRY, 0);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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