1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/* 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_face_area_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_output<decl::Float>(N_("Area"))
.field_source()
.description(N_("The surface area of each of the mesh's faces"));
}
static VArray<float> construct_face_area_gvarray(const MeshComponent &component,
const eAttrDomain domain)
{
const Mesh *mesh = component.get_for_read();
if (mesh == nullptr) {
return {};
}
auto area_fn = [mesh](const int i) -> float {
const MPoly *mp = &mesh->mpoly[i];
return BKE_mesh_calc_poly_area(mp, &mesh->mloop[mp->loopstart], mesh->mvert);
};
return component.attributes()->adapt_domain<float>(
VArray<float>::ForFunc(mesh->totpoly, area_fn), ATTR_DOMAIN_FACE, domain);
}
class FaceAreaFieldInput final : public GeometryFieldInput {
public:
FaceAreaFieldInput() : GeometryFieldInput(CPPType::get<float>(), "Face Area Field")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const GeometryComponent &component,
const eAttrDomain domain,
IndexMask UNUSED(mask)) const final
{
if (component.type() == GEO_COMPONENT_TYPE_MESH) {
const MeshComponent &mesh_component = static_cast<const MeshComponent &>(component);
return construct_face_area_gvarray(mesh_component, domain);
}
return {};
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 1346334523;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const FaceAreaFieldInput *>(&other) != nullptr;
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
params.set_output("Area", Field<float>(std::make_shared<FaceAreaFieldInput>()));
}
} // namespace blender::nodes::node_geo_input_mesh_face_area_cc
void register_node_type_geo_input_mesh_face_area()
{
namespace file_ns = blender::nodes::node_geo_input_mesh_face_area_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_INPUT_MESH_FACE_AREA, "Face Area", NODE_CLASS_INPUT);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
|