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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_array.hh"
#include "BLI_delaunay_2d.h"
#include "BLI_double2.hh"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_mesh.h"
#include "BKE_spline.hh"
#include "BLI_task.hh"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_geometry_util.hh"
namespace blender::nodes {
static void geo_node_curve_fill_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>("Curve");
b.add_output<decl::Geometry>("Mesh");
}
static void geo_node_curve_fill_layout(uiLayout *layout, bContext *UNUSED(C), PointerRNA *ptr)
{
uiItemR(layout, ptr, "mode", UI_ITEM_R_EXPAND, nullptr, ICON_NONE);
}
static void geo_node_curve_fill_init(bNodeTree *UNUSED(ntree), bNode *node)
{
NodeGeometryCurveFill *data = (NodeGeometryCurveFill *)MEM_callocN(sizeof(NodeGeometryCurveFill),
__func__);
data->mode = GEO_NODE_CURVE_FILL_MODE_TRIANGULATED;
node->storage = data;
}
static blender::meshintersect::CDT_result<double> do_cdt(const CurveEval &curve,
const CDT_output_type output_type)
{
Span<SplinePtr> splines = curve.splines();
blender::meshintersect::CDT_input<double> input;
input.need_ids = false;
Array<int> offsets = curve.evaluated_point_offsets();
input.vert.reinitialize(offsets.last());
input.face.reinitialize(splines.size());
for (const int i_spline : splines.index_range()) {
const SplinePtr &spline = splines[i_spline];
const int vert_offset = offsets[i_spline];
Span<float3> positions = spline->evaluated_positions();
for (const int i : positions.index_range()) {
input.vert[vert_offset + i] = double2(positions[i].x, positions[i].y);
}
input.face[i_spline].resize(spline->evaluated_edges_size());
MutableSpan<int> face_verts = input.face[i_spline];
for (const int i : IndexRange(spline->evaluated_edges_size())) {
face_verts[i] = vert_offset + i;
}
}
blender::meshintersect::CDT_result<double> result = delaunay_2d_calc(input, output_type);
return result;
}
/* Converts the CDT result into a Mesh. */
static Mesh *cdt_to_mesh(const blender::meshintersect::CDT_result<double> &result)
{
int vert_len = result.vert.size();
int edge_len = result.edge.size();
int poly_len = result.face.size();
int loop_len = 0;
for (const Vector<int> &face : result.face) {
loop_len += face.size();
}
Mesh *mesh = BKE_mesh_new_nomain(vert_len, edge_len, 0, loop_len, poly_len);
MutableSpan<MVert> verts{mesh->mvert, mesh->totvert};
MutableSpan<MEdge> edges{mesh->medge, mesh->totedge};
MutableSpan<MLoop> loops{mesh->mloop, mesh->totloop};
MutableSpan<MPoly> polys{mesh->mpoly, mesh->totpoly};
for (const int i : IndexRange(result.vert.size())) {
copy_v3_v3(verts[i].co, float3((float)result.vert[i].x, (float)result.vert[i].y, 0.0f));
}
for (const int i : IndexRange(result.edge.size())) {
edges[i].v1 = result.edge[i].first;
edges[i].v2 = result.edge[i].second;
edges[i].flag = ME_EDGEDRAW | ME_EDGERENDER;
}
int i_loop = 0;
for (const int i : IndexRange(result.face.size())) {
polys[i].loopstart = i_loop;
polys[i].totloop = result.face[i].size();
for (const int j : result.face[i].index_range()) {
loops[i_loop].v = result.face[i][j];
i_loop++;
}
}
/* The delaunay triangulation doesn't seem to return all of the necessary edges, even in
* triangulation mode. */
BKE_mesh_calc_edges(mesh, true, false);
return mesh;
}
static void curve_fill_calculate(GeometrySet &geometry_set, const GeometryNodeCurveFillMode mode)
{
if (!geometry_set.has_curve()) {
return;
}
const CurveEval &curve = *geometry_set.get_curve_for_read();
if (curve.splines().is_empty()) {
geometry_set.replace_curve(nullptr);
return;
}
const CDT_output_type output_type = (mode == GEO_NODE_CURVE_FILL_MODE_NGONS) ?
CDT_CONSTRAINTS_VALID_BMESH_WITH_HOLES :
CDT_INSIDE_WITH_HOLES;
const blender::meshintersect::CDT_result<double> results = do_cdt(curve, output_type);
Mesh *mesh = cdt_to_mesh(results);
geometry_set.replace_mesh(mesh);
geometry_set.replace_curve(nullptr);
}
static void geo_node_curve_fill_exec(GeoNodeExecParams params)
{
GeometrySet geometry_set = params.extract_input<GeometrySet>("Curve");
const NodeGeometryCurveFill &storage = *(const NodeGeometryCurveFill *)params.node().storage;
const GeometryNodeCurveFillMode mode = (GeometryNodeCurveFillMode)storage.mode;
if (geometry_set.has_instances()) {
InstancesComponent &instances = geometry_set.get_component_for_write<InstancesComponent>();
instances.ensure_geometry_instances();
threading::parallel_for(IndexRange(instances.references_amount()), 16, [&](IndexRange range) {
for (int i : range) {
GeometrySet &geometry_set = instances.geometry_set_from_reference(i);
geometry_set = bke::geometry_set_realize_instances(geometry_set);
curve_fill_calculate(geometry_set, mode);
}
});
params.set_output("Mesh", std::move(geometry_set));
return;
}
curve_fill_calculate(geometry_set, mode);
params.set_output("Mesh", std::move(geometry_set));
}
} // namespace blender::nodes
void register_node_type_geo_curve_fill()
{
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_CURVE_FILL, "Curve Fill", NODE_CLASS_GEOMETRY, 0);
node_type_init(&ntype, blender::nodes::geo_node_curve_fill_init);
node_type_storage(
&ntype, "NodeGeometryCurveFill", node_free_standard_storage, node_copy_standard_storage);
ntype.declare = blender::nodes::geo_node_curve_fill_declare;
ntype.geometry_node_execute = blender::nodes::geo_node_curve_fill_exec;
ntype.draw_buttons = blender::nodes::geo_node_curve_fill_layout;
nodeRegisterType(&ntype);
}
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