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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BLI_task.hh"
#include "BKE_curves.hh"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_input_tangent_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_output<decl::Vector>(N_("Tangent")).field_source();
}
static Array<float3> curve_tangent_point_domain(const bke::CurvesGeometry &curves)
{
const VArray<int8_t> types = curves.curve_types();
const VArray<int> resolutions = curves.resolution();
const VArray<bool> cyclic = curves.cyclic();
const Span<float3> positions = curves.positions();
const Span<float3> evaluated_tangents = curves.evaluated_tangents();
Array<float3> results(curves.points_num());
threading::parallel_for(curves.curves_range(), 128, [&](IndexRange range) {
for (const int i_curve : range) {
const IndexRange points = curves.points_for_curve(i_curve);
const IndexRange evaluated_points = curves.evaluated_points_for_curve(i_curve);
MutableSpan<float3> curve_tangents = results.as_mutable_span().slice(points);
switch (types[i_curve]) {
case CURVE_TYPE_CATMULL_ROM: {
Span<float3> tangents = evaluated_tangents.slice(evaluated_points);
const int resolution = resolutions[i_curve];
for (const int i : IndexRange(points.size())) {
curve_tangents[i] = tangents[resolution * i];
}
break;
}
case CURVE_TYPE_POLY:
curve_tangents.copy_from(evaluated_tangents.slice(evaluated_points));
break;
case CURVE_TYPE_BEZIER: {
Span<float3> tangents = evaluated_tangents.slice(evaluated_points);
curve_tangents.first() = tangents.first();
const Span<int> offsets = curves.bezier_evaluated_offsets_for_curve(i_curve);
for (const int i : IndexRange(points.size()).drop_front(1)) {
curve_tangents[i] = tangents[offsets[i - 1]];
}
break;
}
case CURVE_TYPE_NURBS: {
const Span<float3> curve_positions = positions.slice(points);
bke::curves::poly::calculate_tangents(curve_positions, cyclic[i_curve], curve_tangents);
break;
}
}
}
});
return results;
}
static VArray<float3> construct_curve_tangent_gvarray(const bke::CurvesGeometry &curves,
const eAttrDomain domain)
{
const VArray<int8_t> types = curves.curve_types();
if (curves.is_single_type(CURVE_TYPE_POLY)) {
return curves.adapt_domain<float3>(
VArray<float3>::ForSpan(curves.evaluated_tangents()), ATTR_DOMAIN_POINT, domain);
}
Array<float3> tangents = curve_tangent_point_domain(curves);
if (domain == ATTR_DOMAIN_POINT) {
return VArray<float3>::ForContainer(std::move(tangents));
}
if (domain == ATTR_DOMAIN_CURVE) {
return curves.adapt_domain<float3>(
VArray<float3>::ForContainer(std::move(tangents)), ATTR_DOMAIN_POINT, ATTR_DOMAIN_CURVE);
}
return nullptr;
}
class TangentFieldInput final : public bke::CurvesFieldInput {
public:
TangentFieldInput() : bke::CurvesFieldInput(CPPType::get<float3>(), "Tangent node")
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const bke::CurvesGeometry &curves,
const eAttrDomain domain,
const IndexMask /*mask*/) const final
{
return construct_curve_tangent_gvarray(curves, domain);
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 91827364589;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const TangentFieldInput *>(&other) != nullptr;
}
std::optional<eAttrDomain> preferred_domain(const bke::CurvesGeometry & /*curves*/) const final
{
return ATTR_DOMAIN_POINT;
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
Field<float3> tangent_field{std::make_shared<TangentFieldInput>()};
params.set_output("Tangent", std::move(tangent_field));
}
} // namespace blender::nodes::node_geo_input_tangent_cc
void register_node_type_geo_input_tangent()
{
namespace file_ns = blender::nodes::node_geo_input_tangent_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_INPUT_TANGENT, "Curve Tangent", NODE_CLASS_INPUT);
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.declare = file_ns::node_declare;
nodeRegisterType(&ntype);
}
|
