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tornavis/source/blender/blenkernel/intern/geometry_set_instances.cc

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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 "BKE_collection.h"
#include "BKE_geometry_set_instances.hh"
#include "BKE_material.h"
#include "BKE_mesh.h"
#include "BKE_mesh_wrapper.h"
#include "BKE_modifier.h"
#include "BKE_pointcloud.h"
#include "BKE_spline.hh"
#include "DNA_collection_types.h"
#include "DNA_layer_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_pointcloud_types.h"
namespace blender::bke {
static void geometry_set_collect_recursive(const GeometrySet &geometry_set,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets);
static void geometry_set_collect_recursive_collection(const Collection &collection,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets);
static void add_final_mesh_as_geometry_component(const Object &object, GeometrySet &geometry_set)
{
Mesh *mesh = BKE_modifier_get_evaluated_mesh_from_evaluated_object(&const_cast<Object &>(object),
false);
if (mesh != nullptr) {
BKE_mesh_wrapper_ensure_mdata(mesh);
MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();
mesh_component.replace(mesh, GeometryOwnershipType::ReadOnly);
}
}
/**
* \note This doesn't extract instances from the "dupli" system for non-geometry-nodes instances.
*/
GeometrySet object_get_evaluated_geometry_set(const Object &object)
{
if (object.type == OB_MESH && object.mode == OB_MODE_EDIT) {
GeometrySet geometry_set;
if (object.runtime.geometry_set_eval != nullptr) {
/* `geometry_set_eval` only contains non-mesh components, see `editbmesh_build_data`. */
geometry_set = *object.runtime.geometry_set_eval;
}
add_final_mesh_as_geometry_component(object, geometry_set);
return geometry_set;
}
if (object.runtime.geometry_set_eval != nullptr) {
return *object.runtime.geometry_set_eval;
}
/* Otherwise, construct a new geometry set with the component based on the object type. */
GeometrySet geometry_set;
if (object.type == OB_MESH) {
add_final_mesh_as_geometry_component(object, geometry_set);
}
/* TODO: Cover the case of point-clouds without modifiers-- they may not be covered by the
* #geometry_set_eval case above. */
/* TODO: Add volume support. */
/* Return by value since there is not always an existing geometry set owned elsewhere to use. */
return geometry_set;
}
static void geometry_set_collect_recursive_collection_instance(
const Collection &collection, const float4x4 &transform, Vector<GeometryInstanceGroup> &r_sets)
{
float4x4 offset_matrix = float4x4::identity();
sub_v3_v3(offset_matrix.values[3], collection.instance_offset);
const float4x4 instance_transform = transform * offset_matrix;
geometry_set_collect_recursive_collection(collection, instance_transform, r_sets);
}
static void geometry_set_collect_recursive_object(const Object &object,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
GeometrySet instance_geometry_set = object_get_evaluated_geometry_set(object);
geometry_set_collect_recursive(instance_geometry_set, transform, r_sets);
if (object.type == OB_EMPTY) {
const Collection *collection_instance = object.instance_collection;
if (collection_instance != nullptr) {
geometry_set_collect_recursive_collection_instance(*collection_instance, transform, r_sets);
}
}
}
static void geometry_set_collect_recursive_collection(const Collection &collection,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
LISTBASE_FOREACH (const CollectionObject *, collection_object, &collection.gobject) {
BLI_assert(collection_object->ob != nullptr);
const Object &object = *collection_object->ob;
const float4x4 object_transform = transform * object.obmat;
geometry_set_collect_recursive_object(object, object_transform, r_sets);
}
LISTBASE_FOREACH (const CollectionChild *, collection_child, &collection.children) {
BLI_assert(collection_child->collection != nullptr);
const Collection &collection = *collection_child->collection;
geometry_set_collect_recursive_collection(collection, transform, r_sets);
}
}
static void geometry_set_collect_recursive(const GeometrySet &geometry_set,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
r_sets.append({geometry_set, {transform}});
if (geometry_set.has_instances()) {
const InstancesComponent &instances_component =
*geometry_set.get_component_for_read<InstancesComponent>();
Span<float4x4> transforms = instances_component.instance_transforms();
Span<int> handles = instances_component.instance_reference_handles();
Span<InstanceReference> references = instances_component.references();
for (const int i : transforms.index_range()) {
const InstanceReference &reference = references[handles[i]];
const float4x4 instance_transform = transform * transforms[i];
switch (reference.type()) {
case InstanceReference::Type::Object: {
Object &object = reference.object();
geometry_set_collect_recursive_object(object, instance_transform, r_sets);
break;
}
case InstanceReference::Type::Collection: {
Collection &collection = reference.collection();
geometry_set_collect_recursive_collection_instance(
collection, instance_transform, r_sets);
break;
}
case InstanceReference::Type::GeometrySet: {
const GeometrySet &geometry_set = reference.geometry_set();
geometry_set_collect_recursive(geometry_set, instance_transform, r_sets);
break;
}
case InstanceReference::Type::None: {
break;
}
}
}
}
}
/**
* Return flattened vector of the geometry component's recursive instances. I.e. all collection
* instances and object instances will be expanded into the instances of their geometry components.
* Even the instances in those geometry components' will be included.
*
* \note For convenience (to avoid duplication in the caller), the returned vector also contains
* the argument geometry set.
*
* \note This doesn't extract instances from the "dupli" system for non-geometry-nodes instances.
*/
void geometry_set_gather_instances(const GeometrySet &geometry_set,
Vector<GeometryInstanceGroup> &r_instance_groups)
{
geometry_set_collect_recursive(geometry_set, float4x4::identity(), r_instance_groups);
}
void geometry_set_gather_instances_attribute_info(Span<GeometryInstanceGroup> set_groups,
Span<GeometryComponentType> component_types,
const Set<std::string> &ignored_attributes,
Map<AttributeIDRef, AttributeKind> &r_attributes)
{
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
for (const GeometryComponentType component_type : component_types) {
if (!set.has(component_type)) {
continue;
}
const GeometryComponent &component = *set.get_component_for_read(component_type);
component.attribute_foreach(
[&](const AttributeIDRef &attribute_id, const AttributeMetaData &meta_data) {
if (attribute_id.is_named() && ignored_attributes.contains(attribute_id.name())) {
return true;
}
auto add_info = [&](AttributeKind *attribute_kind) {
attribute_kind->domain = meta_data.domain;
attribute_kind->data_type = meta_data.data_type;
};
auto modify_info = [&](AttributeKind *attribute_kind) {
attribute_kind->domain = meta_data.domain; /* TODO: Use highest priority domain. */
attribute_kind->data_type = bke::attribute_data_type_highest_complexity(
{attribute_kind->data_type, meta_data.data_type});
};
r_attributes.add_or_modify(attribute_id, add_info, modify_info);
return true;
});
}
}
}
static Mesh *join_mesh_topology_and_builtin_attributes(Span<GeometryInstanceGroup> set_groups)
{
int totverts = 0;
int totloops = 0;
int totedges = 0;
int totpolys = 0;
int64_t cd_dirty_vert = 0;
int64_t cd_dirty_poly = 0;
int64_t cd_dirty_edge = 0;
int64_t cd_dirty_loop = 0;
VectorSet<Material *> materials;
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
const int tot_transforms = set_group.transforms.size();
if (set.has_mesh()) {
const Mesh &mesh = *set.get_mesh_for_read();
totverts += mesh.totvert * tot_transforms;
totloops += mesh.totloop * tot_transforms;
totedges += mesh.totedge * tot_transforms;
totpolys += mesh.totpoly * tot_transforms;
cd_dirty_vert |= mesh.runtime.cd_dirty_vert;
cd_dirty_poly |= mesh.runtime.cd_dirty_poly;
cd_dirty_edge |= mesh.runtime.cd_dirty_edge;
cd_dirty_loop |= mesh.runtime.cd_dirty_loop;
for (const int slot_index : IndexRange(mesh.totcol)) {
Material *material = mesh.mat[slot_index];
materials.add(material);
}
}
}
/* Don't create an empty mesh. */
if ((totverts + totloops + totedges + totpolys) == 0) {
return nullptr;
}
Mesh *new_mesh = BKE_mesh_new_nomain(totverts, totedges, 0, totloops, totpolys);
/* Copy settings from the first input geometry set with a mesh. */
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
if (set.has_mesh()) {
const Mesh &mesh = *set.get_mesh_for_read();
BKE_mesh_copy_parameters_for_eval(new_mesh, &mesh);
break;
}
}
for (const int i : IndexRange(materials.size())) {
Material *material = materials[i];
BKE_id_material_eval_assign(&new_mesh->id, i + 1, material);
}
new_mesh->runtime.cd_dirty_vert = cd_dirty_vert;
new_mesh->runtime.cd_dirty_poly = cd_dirty_poly;
new_mesh->runtime.cd_dirty_edge = cd_dirty_edge;
new_mesh->runtime.cd_dirty_loop = cd_dirty_loop;
int vert_offset = 0;
int loop_offset = 0;
int edge_offset = 0;
int poly_offset = 0;
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
if (set.has_mesh()) {
const Mesh &mesh = *set.get_mesh_for_read();
Array<int> material_index_map(mesh.totcol);
for (const int i : IndexRange(mesh.totcol)) {
Material *material = mesh.mat[i];
const int new_material_index = materials.index_of(material);
material_index_map[i] = new_material_index;
}
for (const float4x4 &transform : set_group.transforms) {
for (const int i : IndexRange(mesh.totvert)) {
const MVert &old_vert = mesh.mvert[i];
MVert &new_vert = new_mesh->mvert[vert_offset + i];
new_vert = old_vert;
const float3 new_position = transform * float3(old_vert.co);
copy_v3_v3(new_vert.co, new_position);
}
for (const int i : IndexRange(mesh.totedge)) {
const MEdge &old_edge = mesh.medge[i];
MEdge &new_edge = new_mesh->medge[edge_offset + i];
new_edge = old_edge;
new_edge.v1 += vert_offset;
new_edge.v2 += vert_offset;
}
for (const int i : IndexRange(mesh.totloop)) {
const MLoop &old_loop = mesh.mloop[i];
MLoop &new_loop = new_mesh->mloop[loop_offset + i];
new_loop = old_loop;
new_loop.v += vert_offset;
new_loop.e += edge_offset;
}
for (const int i : IndexRange(mesh.totpoly)) {
const MPoly &old_poly = mesh.mpoly[i];
MPoly &new_poly = new_mesh->mpoly[poly_offset + i];
new_poly = old_poly;
new_poly.loopstart += loop_offset;
if (old_poly.mat_nr >= 0 && old_poly.mat_nr < mesh.totcol) {
new_poly.mat_nr = material_index_map[new_poly.mat_nr];
}
else {
/* The material index was invalid before. */
new_poly.mat_nr = 0;
}
}
vert_offset += mesh.totvert;
loop_offset += mesh.totloop;
edge_offset += mesh.totedge;
poly_offset += mesh.totpoly;
}
}
}
/* A possible optimization is to only tag the normals dirty when there are transforms that change
* normals. */
BKE_mesh_normals_tag_dirty(new_mesh);
return new_mesh;
}
static void join_attributes(Span<GeometryInstanceGroup> set_groups,
Span<GeometryComponentType> component_types,
const Map<AttributeIDRef, AttributeKind> &attribute_info,
GeometryComponent &result)
{
for (Map<AttributeIDRef, AttributeKind>::Item entry : attribute_info.items()) {
const AttributeIDRef attribute_id = entry.key;
const AttributeDomain domain_output = entry.value.domain;
const CustomDataType data_type_output = entry.value.data_type;
const CPPType *cpp_type = bke::custom_data_type_to_cpp_type(data_type_output);
BLI_assert(cpp_type != nullptr);
result.attribute_try_create(
entry.key, domain_output, data_type_output, AttributeInitDefault());
WriteAttributeLookup write_attribute = result.attribute_try_get_for_write(attribute_id);
if (!write_attribute || &write_attribute.varray.type() != cpp_type ||
write_attribute.domain != domain_output) {
continue;
}
fn::GVMutableArray_GSpan dst_span{write_attribute.varray};
int offset = 0;
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
for (const GeometryComponentType component_type : component_types) {
if (set.has(component_type)) {
const GeometryComponent &component = *set.get_component_for_read(component_type);
const int domain_size = component.attribute_domain_size(domain_output);
if (domain_size == 0) {
continue; /* Domain size is 0, so no need to increment the offset. */
}
GVArray source_attribute = component.attribute_try_get_for_read(
attribute_id, domain_output, data_type_output);
if (source_attribute) {
fn::GVArray_GSpan src_span{source_attribute};
const void *src_buffer = src_span.data();
for (const int UNUSED(i) : set_group.transforms.index_range()) {
void *dst_buffer = dst_span[offset];
cpp_type->copy_assign_n(src_buffer, dst_buffer, domain_size);
offset += domain_size;
}
}
else {
offset += domain_size * set_group.transforms.size();
}
}
}
}
dst_span.save();
}
}
static PointCloud *join_pointcloud_position_attribute(Span<GeometryInstanceGroup> set_groups)
{
/* Count the total number of points. */
int totpoint = 0;
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
if (set.has<PointCloudComponent>()) {
const PointCloudComponent &component = *set.get_component_for_read<PointCloudComponent>();
totpoint += component.attribute_domain_size(ATTR_DOMAIN_POINT);
}
}
if (totpoint == 0) {
return nullptr;
}
PointCloud *new_pointcloud = BKE_pointcloud_new_nomain(totpoint);
MutableSpan new_positions{(float3 *)new_pointcloud->co, new_pointcloud->totpoint};
/* Transform each instance's point locations into the new point cloud. */
int offset = 0;
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
const PointCloud *pointcloud = set.get_pointcloud_for_read();
if (pointcloud == nullptr) {
continue;
}
for (const float4x4 &transform : set_group.transforms) {
for (const int i : IndexRange(pointcloud->totpoint)) {
new_positions[offset + i] = transform * float3(pointcloud->co[i]);
}
offset += pointcloud->totpoint;
}
}
return new_pointcloud;
}
static CurveEval *join_curve_splines_and_builtin_attributes(Span<GeometryInstanceGroup> set_groups)
{
Vector<SplinePtr> new_splines;
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
if (!set.has_curve()) {
continue;
}
const CurveEval &source_curve = *set.get_curve_for_read();
for (const SplinePtr &source_spline : source_curve.splines()) {
for (const float4x4 &transform : set_group.transforms) {
SplinePtr new_spline = source_spline->copy_without_attributes();
new_spline->transform(transform);
new_splines.append(std::move(new_spline));
}
}
}
if (new_splines.is_empty()) {
return nullptr;
}
CurveEval *new_curve = new CurveEval();
for (SplinePtr &new_spline : new_splines) {
new_curve->add_spline(std::move(new_spline));
}
new_curve->attributes.reallocate(new_curve->splines().size());
return new_curve;
}
static void join_instance_groups_mesh(Span<GeometryInstanceGroup> set_groups, GeometrySet &result)
{
Mesh *new_mesh = join_mesh_topology_and_builtin_attributes(set_groups);
if (new_mesh == nullptr) {
return;
}
MeshComponent &dst_component = result.get_component_for_write<MeshComponent>();
dst_component.replace(new_mesh);
/* Don't copy attributes that are stored directly in the mesh data structs. */
Map<AttributeIDRef, AttributeKind> attributes;
geometry_set_gather_instances_attribute_info(
set_groups,
{GEO_COMPONENT_TYPE_MESH},
{"position", "material_index", "normal", "shade_smooth", "crease"},
attributes);
join_attributes(set_groups,
{GEO_COMPONENT_TYPE_MESH},
attributes,
static_cast<GeometryComponent &>(dst_component));
}
static void join_instance_groups_pointcloud(Span<GeometryInstanceGroup> set_groups,
GeometrySet &result)
{
PointCloud *new_pointcloud = join_pointcloud_position_attribute(set_groups);
if (new_pointcloud == nullptr) {
return;
}
PointCloudComponent &dst_component = result.get_component_for_write<PointCloudComponent>();
dst_component.replace(new_pointcloud);
Map<AttributeIDRef, AttributeKind> attributes;
geometry_set_gather_instances_attribute_info(
set_groups, {GEO_COMPONENT_TYPE_POINT_CLOUD}, {"position"}, attributes);
join_attributes(set_groups,
{GEO_COMPONENT_TYPE_POINT_CLOUD},
attributes,
static_cast<GeometryComponent &>(dst_component));
}
static void join_instance_groups_volume(Span<GeometryInstanceGroup> set_groups,
GeometrySet &result)
{
/* Not yet supported; for now only return the first volume. Joining volume grids with the same
* name requires resampling of at least one of the grids. The cell size of the resulting volume
* has to be determined somehow. */
for (const GeometryInstanceGroup &set_group : set_groups) {
const GeometrySet &set = set_group.geometry_set;
if (set.has<VolumeComponent>()) {
result.add(*set.get_component_for_read<VolumeComponent>());
return;
}
}
}
/**
* Curve point domain attributes must be in the same order on every spline. The order might have
* been different on separate instances, so ensure that all splines have the same order. Note that
* because #Map is used, the order is not necessarily consistent every time, but it is the same for
* every spline, and that's what matters.
*/
static void sort_curve_point_attributes(const Map<AttributeIDRef, AttributeKind> &info,
MutableSpan<SplinePtr> splines)
{
Vector<AttributeIDRef> new_order;
for (Map<AttributeIDRef, AttributeKind>::Item item : info.items()) {
if (item.value.domain == ATTR_DOMAIN_POINT) {
/* Only sort attributes stored on splines. */
new_order.append(item.key);
}
}
for (SplinePtr &spline : splines) {
spline->attributes.reorder(new_order);
}
}
static void join_instance_groups_curve(Span<GeometryInstanceGroup> set_groups, GeometrySet &result)
{
CurveEval *curve = join_curve_splines_and_builtin_attributes(set_groups);
if (curve == nullptr) {
return;
}
CurveComponent &dst_component = result.get_component_for_write<CurveComponent>();
dst_component.replace(curve);
Map<AttributeIDRef, AttributeKind> attributes;
geometry_set_gather_instances_attribute_info(
set_groups,
{GEO_COMPONENT_TYPE_CURVE},
{"position", "radius", "tilt", "handle_left", "handle_right", "cyclic", "resolution"},
attributes);
join_attributes(set_groups,
{GEO_COMPONENT_TYPE_CURVE},
attributes,
static_cast<GeometryComponent &>(dst_component));
sort_curve_point_attributes(attributes, curve->splines());
curve->assert_valid_point_attributes();
}
GeometrySet geometry_set_realize_instances(const GeometrySet &geometry_set)
{
if (!geometry_set.has_instances()) {
return geometry_set;
}
GeometrySet new_geometry_set;
Vector<GeometryInstanceGroup> set_groups;
geometry_set_gather_instances(geometry_set, set_groups);
join_instance_groups_mesh(set_groups, new_geometry_set);
join_instance_groups_pointcloud(set_groups, new_geometry_set);
join_instance_groups_volume(set_groups, new_geometry_set);
join_instance_groups_curve(set_groups, new_geometry_set);
return new_geometry_set;
}
} // namespace blender::bke
void InstancesComponent::foreach_referenced_geometry(
blender::FunctionRef<void(const GeometrySet &geometry_set)> callback) const
{
using namespace blender::bke;
for (const InstanceReference &reference : references_) {
switch (reference.type()) {
case InstanceReference::Type::Object: {
const Object &object = reference.object();
const GeometrySet object_geometry_set = object_get_evaluated_geometry_set(object);
callback(object_geometry_set);
break;
}
case InstanceReference::Type::Collection: {
Collection &collection = reference.collection();
FOREACH_COLLECTION_OBJECT_RECURSIVE_BEGIN (&collection, object) {
const GeometrySet object_geometry_set = object_get_evaluated_geometry_set(*object);
callback(object_geometry_set);
}
FOREACH_COLLECTION_OBJECT_RECURSIVE_END;
break;
}
case InstanceReference::Type::GeometrySet: {
const GeometrySet &instance_geometry_set = reference.geometry_set();
callback(instance_geometry_set);
break;
}
case InstanceReference::Type::None: {
break;
}
}
}
}
/**
* If references have a collection or object type, convert them into geometry instances
* recursively. After that, the geometry sets can be edited. There may still be instances of other
* types of they can't be converted to geometry sets.
*/
void InstancesComponent::ensure_geometry_instances()
{
using namespace blender;
using namespace blender::bke;
VectorSet<InstanceReference> new_references;
new_references.reserve(references_.size());
for (const InstanceReference &reference : references_) {
switch (reference.type()) {
case InstanceReference::Type::None:
case InstanceReference::Type::GeometrySet: {
/* Those references can stay as their were. */
new_references.add_new(reference);
break;
}
case InstanceReference::Type::Object: {
/* Create a new reference that contains the geometry set of the object. We may want to
* treat e.g. lamps and similar object types separately here. */
const Object &object = reference.object();
GeometrySet object_geometry_set = object_get_evaluated_geometry_set(object);
if (object_geometry_set.has_instances()) {
InstancesComponent &component =
object_geometry_set.get_component_for_write<InstancesComponent>();
component.ensure_geometry_instances();
}
new_references.add_new(std::move(object_geometry_set));
break;
}
case InstanceReference::Type::Collection: {
/* Create a new reference that contains a geometry set that contains all objects from the
* collection as instances. */
GeometrySet collection_geometry_set;
InstancesComponent &component =
collection_geometry_set.get_component_for_write<InstancesComponent>();
Collection &collection = reference.collection();
FOREACH_COLLECTION_OBJECT_RECURSIVE_BEGIN (&collection, object) {
const int handle = component.add_reference(*object);
component.add_instance(handle, object->obmat);
float4x4 &transform = component.instance_transforms().last();
sub_v3_v3(transform.values[3], collection.instance_offset);
}
FOREACH_COLLECTION_OBJECT_RECURSIVE_END;
component.ensure_geometry_instances();
new_references.add_new(std::move(collection_geometry_set));
break;
}
}
}
references_ = std::move(new_references);
}
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