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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 "BLI_kdtree.h"
#include "BLI_noise.hh"
#include "BLI_rand.hh"
#include "BLI_task.hh"
#include "BLI_timeit.hh"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_pointcloud_types.h"
#include "BKE_attribute_math.hh"
#include "BKE_bvhutils.h"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_mesh_sample.hh"
#include "BKE_pointcloud.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_distribute_points_on_faces_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Mesh")).supported_type(GEO_COMPONENT_TYPE_MESH);
b.add_input<decl::Bool>(N_("Selection")).default_value(true).hide_value().supports_field();
b.add_input<decl::Float>(N_("Distance Min")).min(0.0f).subtype(PROP_DISTANCE);
b.add_input<decl::Float>(N_("Density Max")).default_value(10.0f).min(0.0f);
b.add_input<decl::Float>(N_("Density")).default_value(10.0f).supports_field();
b.add_input<decl::Float>(N_("Density Factor"))
.default_value(1.0f)
.min(0.0f)
.max(1.0f)
.subtype(PROP_FACTOR)
.supports_field();
b.add_input<decl::Int>(N_("Seed"));
b.add_output<decl::Geometry>(N_("Points"));
b.add_output<decl::Vector>(N_("Normal")).field_source();
b.add_output<decl::Vector>(N_("Rotation")).subtype(PROP_EULER).field_source();
}
static void node_layout(uiLayout *layout, bContext *UNUSED(C), PointerRNA *ptr)
{
uiItemR(layout, ptr, "distribute_method", 0, "", ICON_NONE);
}
static void node_point_distribute_points_on_faces_update(bNodeTree *ntree, bNode *node)
{
bNodeSocket *sock_distance_min = (bNodeSocket *)BLI_findlink(&node->inputs, 2);
bNodeSocket *sock_density_max = (bNodeSocket *)sock_distance_min->next;
bNodeSocket *sock_density = sock_density_max->next;
bNodeSocket *sock_density_factor = sock_density->next;
nodeSetSocketAvailability(ntree,
sock_distance_min,
node->custom1 == GEO_NODE_POINT_DISTRIBUTE_POINTS_ON_FACES_POISSON);
nodeSetSocketAvailability(
ntree, sock_density_max, node->custom1 == GEO_NODE_POINT_DISTRIBUTE_POINTS_ON_FACES_POISSON);
nodeSetSocketAvailability(
ntree, sock_density, node->custom1 == GEO_NODE_POINT_DISTRIBUTE_POINTS_ON_FACES_RANDOM);
nodeSetSocketAvailability(ntree,
sock_density_factor,
node->custom1 == GEO_NODE_POINT_DISTRIBUTE_POINTS_ON_FACES_POISSON);
}
/**
* Use an arbitrary choice of axes for a usable rotation attribute directly out of this node.
*/
static float3 normal_to_euler_rotation(const float3 normal)
{
float quat[4];
vec_to_quat(quat, normal, OB_NEGZ, OB_POSY);
float3 rotation;
quat_to_eul(rotation, quat);
return rotation;
}
static void sample_mesh_surface(const Mesh &mesh,
const float base_density,
const Span<float> density_factors,
const int seed,
Vector<float3> &r_positions,
Vector<float3> &r_bary_coords,
Vector<int> &r_looptri_indices)
{
const Span<MLoopTri> looptris{BKE_mesh_runtime_looptri_ensure(&mesh),
BKE_mesh_runtime_looptri_len(&mesh)};
for (const int looptri_index : looptris.index_range()) {
const MLoopTri &looptri = looptris[looptri_index];
const int v0_loop = looptri.tri[0];
const int v1_loop = looptri.tri[1];
const int v2_loop = looptri.tri[2];
const int v0_index = mesh.mloop[v0_loop].v;
const int v1_index = mesh.mloop[v1_loop].v;
const int v2_index = mesh.mloop[v2_loop].v;
const float3 v0_pos = float3(mesh.mvert[v0_index].co);
const float3 v1_pos = float3(mesh.mvert[v1_index].co);
const float3 v2_pos = float3(mesh.mvert[v2_index].co);
float looptri_density_factor = 1.0f;
if (!density_factors.is_empty()) {
const float v0_density_factor = std::max(0.0f, density_factors[v0_loop]);
const float v1_density_factor = std::max(0.0f, density_factors[v1_loop]);
const float v2_density_factor = std::max(0.0f, density_factors[v2_loop]);
looptri_density_factor = (v0_density_factor + v1_density_factor + v2_density_factor) / 3.0f;
}
const float area = area_tri_v3(v0_pos, v1_pos, v2_pos);
const int looptri_seed = noise::hash(looptri_index, seed);
RandomNumberGenerator looptri_rng(looptri_seed);
const float points_amount_fl = area * base_density * looptri_density_factor;
const float add_point_probability = fractf(points_amount_fl);
const bool add_point = add_point_probability > looptri_rng.get_float();
const int point_amount = (int)points_amount_fl + (int)add_point;
for (int i = 0; i < point_amount; i++) {
const float3 bary_coord = looptri_rng.get_barycentric_coordinates();
float3 point_pos;
interp_v3_v3v3v3(point_pos, v0_pos, v1_pos, v2_pos, bary_coord);
r_positions.append(point_pos);
r_bary_coords.append(bary_coord);
r_looptri_indices.append(looptri_index);
}
}
}
BLI_NOINLINE static KDTree_3d *build_kdtree(Span<float3> positions)
{
KDTree_3d *kdtree = BLI_kdtree_3d_new(positions.size());
int i_point = 0;
for (const float3 position : positions) {
BLI_kdtree_3d_insert(kdtree, i_point, position);
i_point++;
}
BLI_kdtree_3d_balance(kdtree);
return kdtree;
}
BLI_NOINLINE static void update_elimination_mask_for_close_points(
Span<float3> positions, const float minimum_distance, MutableSpan<bool> elimination_mask)
{
if (minimum_distance <= 0.0f) {
return;
}
KDTree_3d *kdtree = build_kdtree(positions);
for (const int i : positions.index_range()) {
if (elimination_mask[i]) {
continue;
}
struct CallbackData {
int index;
MutableSpan<bool> elimination_mask;
} callback_data = {i, elimination_mask};
BLI_kdtree_3d_range_search_cb(
kdtree,
positions[i],
minimum_distance,
[](void *user_data, int index, const float *UNUSED(co), float UNUSED(dist_sq)) {
CallbackData &callback_data = *static_cast<CallbackData *>(user_data);
if (index != callback_data.index) {
callback_data.elimination_mask[index] = true;
}
return true;
},
&callback_data);
}
BLI_kdtree_3d_free(kdtree);
}
BLI_NOINLINE static void update_elimination_mask_based_on_density_factors(
const Mesh &mesh,
const Span<float> density_factors,
const Span<float3> bary_coords,
const Span<int> looptri_indices,
const MutableSpan<bool> elimination_mask)
{
const Span<MLoopTri> looptris{BKE_mesh_runtime_looptri_ensure(&mesh),
BKE_mesh_runtime_looptri_len(&mesh)};
for (const int i : bary_coords.index_range()) {
if (elimination_mask[i]) {
continue;
}
const MLoopTri &looptri = looptris[looptri_indices[i]];
const float3 bary_coord = bary_coords[i];
const int v0_loop = looptri.tri[0];
const int v1_loop = looptri.tri[1];
const int v2_loop = looptri.tri[2];
const float v0_density_factor = std::max(0.0f, density_factors[v0_loop]);
const float v1_density_factor = std::max(0.0f, density_factors[v1_loop]);
const float v2_density_factor = std::max(0.0f, density_factors[v2_loop]);
const float probablity = v0_density_factor * bary_coord.x + v1_density_factor * bary_coord.y +
v2_density_factor * bary_coord.z;
const float hash = noise::hash_float_to_float(bary_coord);
if (hash > probablity) {
elimination_mask[i] = true;
}
}
}
BLI_NOINLINE static void eliminate_points_based_on_mask(const Span<bool> elimination_mask,
Vector<float3> &positions,
Vector<float3> &bary_coords,
Vector<int> &looptri_indices)
{
for (int i = positions.size() - 1; i >= 0; i--) {
if (elimination_mask[i]) {
positions.remove_and_reorder(i);
bary_coords.remove_and_reorder(i);
looptri_indices.remove_and_reorder(i);
}
}
}
BLI_NOINLINE static void interpolate_attribute(const Mesh &mesh,
const Span<float3> bary_coords,
const Span<int> looptri_indices,
const AttributeDomain source_domain,
const GVArray &source_data,
GMutableSpan output_data)
{
switch (source_domain) {
case ATTR_DOMAIN_POINT: {
bke::mesh_surface_sample::sample_point_attribute(mesh,
looptri_indices,
bary_coords,
source_data,
IndexMask(output_data.size()),
output_data);
break;
}
case ATTR_DOMAIN_CORNER: {
bke::mesh_surface_sample::sample_corner_attribute(mesh,
looptri_indices,
bary_coords,
source_data,
IndexMask(output_data.size()),
output_data);
break;
}
case ATTR_DOMAIN_FACE: {
bke::mesh_surface_sample::sample_face_attribute(
mesh, looptri_indices, source_data, IndexMask(output_data.size()), output_data);
break;
}
default: {
/* Not supported currently. */
return;
}
}
}
BLI_NOINLINE static void propagate_existing_attributes(
const MeshComponent &mesh_component,
const Map<AttributeIDRef, AttributeKind> &attributes,
GeometryComponent &point_component,
const Span<float3> bary_coords,
const Span<int> looptri_indices)
{
const Mesh &mesh = *mesh_component.get_for_read();
for (Map<AttributeIDRef, AttributeKind>::Item entry : attributes.items()) {
const AttributeIDRef attribute_id = entry.key;
const CustomDataType output_data_type = entry.value.data_type;
ReadAttributeLookup source_attribute = mesh_component.attribute_try_get_for_read(attribute_id);
if (!source_attribute) {
continue;
}
/* The output domain is always #ATTR_DOMAIN_POINT, since we are creating a point cloud. */
OutputAttribute attribute_out = point_component.attribute_try_get_for_output_only(
attribute_id, ATTR_DOMAIN_POINT, output_data_type);
if (!attribute_out) {
continue;
}
GMutableSpan out_span = attribute_out.as_span();
interpolate_attribute(mesh,
bary_coords,
looptri_indices,
source_attribute.domain,
source_attribute.varray,
out_span);
attribute_out.save();
}
}
namespace {
struct AttributeOutputs {
StrongAnonymousAttributeID normal_id;
StrongAnonymousAttributeID rotation_id;
};
} // namespace
BLI_NOINLINE static void compute_attribute_outputs(const MeshComponent &mesh_component,
PointCloudComponent &point_component,
const Span<float3> bary_coords,
const Span<int> looptri_indices,
const AttributeOutputs &attribute_outputs)
{
OutputAttribute_Typed<int> id_attribute = point_component.attribute_try_get_for_output_only<int>(
"id", ATTR_DOMAIN_POINT);
MutableSpan<int> ids = id_attribute.as_span();
OutputAttribute_Typed<float3> normal_attribute;
OutputAttribute_Typed<float3> rotation_attribute;
MutableSpan<float3> normals;
MutableSpan<float3> rotations;
if (attribute_outputs.normal_id) {
normal_attribute = point_component.attribute_try_get_for_output_only<float3>(
attribute_outputs.normal_id.get(), ATTR_DOMAIN_POINT);
normals = normal_attribute.as_span();
}
if (attribute_outputs.rotation_id) {
rotation_attribute = point_component.attribute_try_get_for_output_only<float3>(
attribute_outputs.rotation_id.get(), ATTR_DOMAIN_POINT);
rotations = rotation_attribute.as_span();
}
const Mesh &mesh = *mesh_component.get_for_read();
const Span<MLoopTri> looptris{BKE_mesh_runtime_looptri_ensure(&mesh),
BKE_mesh_runtime_looptri_len(&mesh)};
for (const int i : bary_coords.index_range()) {
const int looptri_index = looptri_indices[i];
const MLoopTri &looptri = looptris[looptri_index];
const float3 &bary_coord = bary_coords[i];
const int v0_index = mesh.mloop[looptri.tri[0]].v;
const int v1_index = mesh.mloop[looptri.tri[1]].v;
const int v2_index = mesh.mloop[looptri.tri[2]].v;
const float3 v0_pos = float3(mesh.mvert[v0_index].co);
const float3 v1_pos = float3(mesh.mvert[v1_index].co);
const float3 v2_pos = float3(mesh.mvert[v2_index].co);
ids[i] = noise::hash(noise::hash_float(bary_coord), looptri_index);
float3 normal;
if (!normals.is_empty() || !rotations.is_empty()) {
normal_tri_v3(normal, v0_pos, v1_pos, v2_pos);
}
if (!normals.is_empty()) {
normals[i] = normal;
}
if (!rotations.is_empty()) {
rotations[i] = normal_to_euler_rotation(normal);
}
}
id_attribute.save();
if (normal_attribute) {
normal_attribute.save();
}
if (rotation_attribute) {
rotation_attribute.save();
}
}
static Array<float> calc_full_density_factors_with_selection(const MeshComponent &component,
const Field<float> &density_field,
const Field<bool> &selection_field)
{
const AttributeDomain attribute_domain = ATTR_DOMAIN_CORNER;
GeometryComponentFieldContext field_context{component, attribute_domain};
const int domain_size = component.attribute_domain_size(attribute_domain);
fn::FieldEvaluator selection_evaluator{field_context, domain_size};
selection_evaluator.add(selection_field);
selection_evaluator.evaluate();
const IndexMask selection_mask = selection_evaluator.get_evaluated_as_mask(0);
Array<float> densities(domain_size, 0.0f);
fn::FieldEvaluator density_evaluator{field_context, &selection_mask};
density_evaluator.add_with_destination(density_field, densities.as_mutable_span());
density_evaluator.evaluate();
return densities;
}
static void distribute_points_random(const MeshComponent &component,
const Field<float> &density_field,
const Field<bool> &selection_field,
const int seed,
Vector<float3> &positions,
Vector<float3> &bary_coords,
Vector<int> &looptri_indices)
{
const Array<float> densities = calc_full_density_factors_with_selection(
component, density_field, selection_field);
const Mesh &mesh = *component.get_for_read();
sample_mesh_surface(mesh, 1.0f, densities, seed, positions, bary_coords, looptri_indices);
}
static void distribute_points_poisson_disk(const MeshComponent &mesh_component,
const float minimum_distance,
const float max_density,
const Field<float> &density_factor_field,
const Field<bool> &selection_field,
const int seed,
Vector<float3> &positions,
Vector<float3> &bary_coords,
Vector<int> &looptri_indices)
{
const Mesh &mesh = *mesh_component.get_for_read();
sample_mesh_surface(mesh, max_density, {}, seed, positions, bary_coords, looptri_indices);
Array<bool> elimination_mask(positions.size(), false);
update_elimination_mask_for_close_points(positions, minimum_distance, elimination_mask);
const Array<float> density_factors = calc_full_density_factors_with_selection(
mesh_component, density_factor_field, selection_field);
update_elimination_mask_based_on_density_factors(
mesh, density_factors, bary_coords, looptri_indices, elimination_mask.as_mutable_span());
eliminate_points_based_on_mask(
elimination_mask.as_span(), positions, bary_coords, looptri_indices);
}
static void point_distribution_calculate(GeometrySet &geometry_set,
const Field<bool> selection_field,
const GeometryNodeDistributePointsOnFacesMode method,
const int seed,
const AttributeOutputs &attribute_outputs,
const GeoNodeExecParams ¶ms)
{
if (!geometry_set.has_mesh()) {
return;
}
const MeshComponent &mesh_component = *geometry_set.get_component_for_read<MeshComponent>();
Vector<float3> positions;
Vector<float3> bary_coords;
Vector<int> looptri_indices;
switch (method) {
case GEO_NODE_POINT_DISTRIBUTE_POINTS_ON_FACES_RANDOM: {
const Field<float> density_field = params.get_input<Field<float>>("Density");
distribute_points_random(mesh_component,
density_field,
selection_field,
seed,
positions,
bary_coords,
looptri_indices);
break;
}
case GEO_NODE_POINT_DISTRIBUTE_POINTS_ON_FACES_POISSON: {
const float minimum_distance = params.get_input<float>("Distance Min");
const float density_max = params.get_input<float>("Density Max");
const Field<float> density_factors_field = params.get_input<Field<float>>("Density Factor");
distribute_points_poisson_disk(mesh_component,
minimum_distance,
density_max,
density_factors_field,
selection_field,
seed,
positions,
bary_coords,
looptri_indices);
break;
}
}
if (positions.is_empty()) {
return;
}
PointCloud *pointcloud = BKE_pointcloud_new_nomain(positions.size());
memcpy(pointcloud->co, positions.data(), sizeof(float3) * positions.size());
uninitialized_fill_n(pointcloud->radius, pointcloud->totpoint, 0.05f);
geometry_set.replace_pointcloud(pointcloud);
PointCloudComponent &point_component =
geometry_set.get_component_for_write<PointCloudComponent>();
Map<AttributeIDRef, AttributeKind> attributes;
geometry_set.gather_attributes_for_propagation(
{GEO_COMPONENT_TYPE_MESH}, GEO_COMPONENT_TYPE_POINT_CLOUD, false, attributes);
/* Position is set separately. */
attributes.remove("position");
propagate_existing_attributes(
mesh_component, attributes, point_component, bary_coords, looptri_indices);
compute_attribute_outputs(
mesh_component, point_component, bary_coords, looptri_indices, attribute_outputs);
}
static void node_geo_exec(GeoNodeExecParams params)
{
GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");
const GeometryNodeDistributePointsOnFacesMode method =
static_cast<GeometryNodeDistributePointsOnFacesMode>(params.node().custom1);
const int seed = params.get_input<int>("Seed") * 5383843;
const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
AttributeOutputs attribute_outputs;
if (params.output_is_required("Normal")) {
attribute_outputs.normal_id = StrongAnonymousAttributeID("Normal");
}
if (params.output_is_required("Rotation")) {
attribute_outputs.rotation_id = StrongAnonymousAttributeID("Rotation");
}
geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
point_distribution_calculate(
geometry_set, selection_field, method, seed, attribute_outputs, params);
/* Keep instances because the original geometry set may contain instances that are processed as
* well. */
geometry_set.keep_only({GEO_COMPONENT_TYPE_POINT_CLOUD, GEO_COMPONENT_TYPE_INSTANCES});
});
params.set_output("Points", std::move(geometry_set));
if (attribute_outputs.normal_id) {
params.set_output(
"Normal",
AnonymousAttributeFieldInput::Create<float3>(std::move(attribute_outputs.normal_id),
params.attribute_producer_name()));
}
if (attribute_outputs.rotation_id) {
params.set_output(
"Rotation",
AnonymousAttributeFieldInput::Create<float3>(std::move(attribute_outputs.rotation_id),
params.attribute_producer_name()));
}
}
} // namespace blender::nodes::node_geo_distribute_points_on_faces_cc
void register_node_type_geo_distribute_points_on_faces()
{
namespace file_ns = blender::nodes::node_geo_distribute_points_on_faces_cc;
static bNodeType ntype;
geo_node_type_base(&ntype,
GEO_NODE_DISTRIBUTE_POINTS_ON_FACES,
"Distribute Points on Faces",
NODE_CLASS_GEOMETRY,
0);
node_type_update(&ntype, file_ns::node_point_distribute_points_on_faces_update);
node_type_size(&ntype, 170, 100, 320);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.draw_buttons = file_ns::node_layout;
nodeRegisterType(&ntype);
}
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