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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_mesh.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_input_mesh_edge_angle_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_output<decl::Float>(N_("Unsigned Angle"))
.field_source()
.description(
"The shortest angle in radians between two faces where they meet at an edge. Flat edges "
"and Non-manifold edges have an angle of zero. Computing this value is faster than the "
"signed angle");
b.add_output<decl::Float>(N_("Signed Angle"))
.field_source()
.description(
"The signed angle in radians between two faces where they meet at an edge. Flat edges "
"and Non-manifold edges have an angle of zero. Concave angles are positive and convex "
"angles are negative. Computing this value is slower than the unsigned angle");
}
struct EdgeMapEntry {
int face_count;
int face_index_1;
int face_index_2;
};
static Array<EdgeMapEntry> create_edge_map(const Span<MPoly> polys,
const Span<MLoop> loops,
const int total_edges)
{
Array<EdgeMapEntry> edge_map(total_edges, {0, 0, 0});
for (const int i_poly : polys.index_range()) {
const MPoly &mpoly = polys[i_poly];
for (const MLoop &loop : loops.slice(mpoly.loopstart, mpoly.totloop)) {
EdgeMapEntry &entry = edge_map[loop.e];
if (entry.face_count == 0) {
entry.face_index_1 = i_poly;
}
else if (entry.face_count == 1) {
entry.face_index_2 = i_poly;
}
entry.face_count++;
}
}
return edge_map;
}
class AngleFieldInput final : public bke::MeshFieldInput {
public:
AngleFieldInput() : bke::MeshFieldInput(CPPType::get<float>(), "Unsigned Angle Field")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const Mesh &mesh,
const eAttrDomain domain,
const IndexMask /*mask*/) const final
{
const Span<float3> positions = mesh.positions();
const Span<MPoly> polys = mesh.polys();
const Span<MLoop> loops = mesh.loops();
Array<EdgeMapEntry> edge_map = create_edge_map(polys, loops, mesh.totedge);
auto angle_fn =
[edge_map = std::move(edge_map), positions, polys, loops](const int i) -> float {
if (edge_map[i].face_count != 2) {
return 0.0f;
}
const MPoly &mpoly_1 = polys[edge_map[i].face_index_1];
const MPoly &mpoly_2 = polys[edge_map[i].face_index_2];
float3 normal_1, normal_2;
BKE_mesh_calc_poly_normal(&mpoly_1,
&loops[mpoly_1.loopstart],
reinterpret_cast<const float(*)[3]>(positions.data()),
normal_1);
BKE_mesh_calc_poly_normal(&mpoly_2,
&loops[mpoly_2.loopstart],
reinterpret_cast<const float(*)[3]>(positions.data()),
normal_2);
return angle_normalized_v3v3(normal_1, normal_2);
};
VArray<float> angles = VArray<float>::ForFunc(mesh.totedge, angle_fn);
return mesh.attributes().adapt_domain<float>(std::move(angles), ATTR_DOMAIN_EDGE, domain);
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 32426725235;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const AngleFieldInput *>(&other) != nullptr;
}
std::optional<eAttrDomain> preferred_domain(const Mesh & /*mesh*/) const override
{
return ATTR_DOMAIN_EDGE;
}
};
class SignedAngleFieldInput final : public bke::MeshFieldInput {
public:
SignedAngleFieldInput() : bke::MeshFieldInput(CPPType::get<float>(), "Signed Angle Field")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const Mesh &mesh,
const eAttrDomain domain,
const IndexMask /*mask*/) const final
{
const Span<float3> positions = mesh.positions();
const Span<MEdge> edges = mesh.edges();
const Span<MPoly> polys = mesh.polys();
const Span<MLoop> loops = mesh.loops();
Array<EdgeMapEntry> edge_map = create_edge_map(polys, loops, mesh.totedge);
auto angle_fn =
[edge_map = std::move(edge_map), positions, edges, polys, loops](const int i) -> float {
if (edge_map[i].face_count != 2) {
return 0.0f;
}
const MPoly &mpoly_1 = polys[edge_map[i].face_index_1];
const MPoly &mpoly_2 = polys[edge_map[i].face_index_2];
/* Find the normals of the 2 polys. */
float3 poly_1_normal, poly_2_normal;
BKE_mesh_calc_poly_normal(&mpoly_1,
&loops[mpoly_1.loopstart],
reinterpret_cast<const float(*)[3]>(positions.data()),
poly_1_normal);
BKE_mesh_calc_poly_normal(&mpoly_2,
&loops[mpoly_2.loopstart],
reinterpret_cast<const float(*)[3]>(positions.data()),
poly_2_normal);
/* Find the centerpoint of the axis edge */
const float3 edge_centerpoint = (positions[edges[i].v1] + positions[edges[i].v2]) * 0.5f;
/* Get the centerpoint of poly 2 and subtract the edge centerpoint to get a tangent
* normal for poly 2. */
float3 poly_center_2;
BKE_mesh_calc_poly_center(&mpoly_2,
&loops[mpoly_2.loopstart],
reinterpret_cast<const float(*)[3]>(positions.data()),
poly_center_2);
const float3 poly_2_tangent = math::normalize(poly_center_2 - edge_centerpoint);
const float concavity = math::dot(poly_1_normal, poly_2_tangent);
/* Get the unsigned angle between the two polys */
const float angle = angle_normalized_v3v3(poly_1_normal, poly_2_normal);
if (angle == 0.0f || angle == 2.0f * M_PI || concavity < 0) {
return angle;
}
return -angle;
};
VArray<float> angles = VArray<float>::ForFunc(mesh.totedge, angle_fn);
return mesh.attributes().adapt_domain<float>(std::move(angles), ATTR_DOMAIN_EDGE, domain);
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 68465416863;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const SignedAngleFieldInput *>(&other) != nullptr;
}
std::optional<eAttrDomain> preferred_domain(const Mesh & /*mesh*/) const override
{
return ATTR_DOMAIN_EDGE;
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
if (params.output_is_required("Unsigned Angle")) {
Field<float> angle_field{std::make_shared<AngleFieldInput>()};
params.set_output("Unsigned Angle", std::move(angle_field));
}
if (params.output_is_required("Signed Angle")) {
Field<float> angle_field{std::make_shared<SignedAngleFieldInput>()};
params.set_output("Signed Angle", std::move(angle_field));
}
}
} // namespace blender::nodes::node_geo_input_mesh_edge_angle_cc
void register_node_type_geo_input_mesh_edge_angle()
{
namespace file_ns = blender::nodes::node_geo_input_mesh_edge_angle_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_INPUT_MESH_EDGE_ANGLE, "Edge Angle", NODE_CLASS_INPUT);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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