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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
* 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 "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_mesh.h"
#include "node_geometry_util.hh"
namespace blender::nodes {
static void geo_node_input_normal_declare(NodeDeclarationBuilder &b)
{
b.add_output<decl::Vector>("Normal");
}
static GVArrayPtr mesh_face_normals(const Mesh &mesh,
const Span<MVert> verts,
const Span<MPoly> polys,
const Span<MLoop> loops,
const IndexMask mask)
{
/* Use existing normals to avoid unnecessarily recalculating them, if possible. */
if (!(mesh.runtime.cd_dirty_poly & CD_MASK_NORMAL) &&
CustomData_has_layer(&mesh.pdata, CD_NORMAL)) {
const void *data = CustomData_get_layer(&mesh.pdata, CD_NORMAL);
return std::make_unique<fn::GVArray_For_Span<float3>>(
Span<float3>((const float3 *)data, polys.size()));
}
auto normal_fn = [verts, polys, loops](const int i) -> float3 {
float3 normal;
const MPoly &poly = polys[i];
BKE_mesh_calc_poly_normal(&poly, &loops[poly.loopstart], verts.data(), normal);
return normal;
};
return std::make_unique<
fn::GVArray_For_EmbeddedVArray<float3, VArray_For_Func<float3, decltype(normal_fn)>>>(
mask.min_array_size(), mask.min_array_size(), normal_fn);
}
static GVArrayPtr mesh_vertex_normals(const Mesh &mesh,
const Span<MVert> verts,
const Span<MPoly> polys,
const Span<MLoop> loops,
const IndexMask mask)
{
/* Use existing normals to avoid unnecessarily recalculating them, if possible. */
if (!(mesh.runtime.cd_dirty_vert & CD_MASK_NORMAL) &&
CustomData_has_layer(&mesh.vdata, CD_NORMAL)) {
const void *data = CustomData_get_layer(&mesh.pdata, CD_NORMAL);
return std::make_unique<fn::GVArray_For_Span<float3>>(
Span<float3>((const float3 *)data, mesh.totvert));
}
/* If the normals are dirty, they must be recalculated for the output of this node's field
* source. Ideally vertex normals could be calculated lazily on a const mesh, protected with a
* mutex. But that's not possible at the moment, so we take ownership of the results. Sadly we
* must also create a copy of MVert to use the mesh normals API. This can be improved by adding
* mutex-protected lazy calculation of normals on meshes.
*
* Use mask.min_array_size() to avoid calculating a final chunk of data if possible. */
Array<MVert> temp_verts(verts);
Array<float3> normals(verts.size()); /* Use full size for accumulation from faces. */
BKE_mesh_calc_normals_poly_and_vertex(temp_verts.data(),
mask.min_array_size(),
loops.data(),
loops.size(),
polys.data(),
polys.size(),
nullptr,
(float(*)[3])normals.data());
return std::make_unique<fn::GVArray_For_ArrayContainer<Array<float3>>>(std::move(normals));
}
static const GVArray *construct_mesh_normals_gvarray(const MeshComponent &mesh_component,
const Mesh &mesh,
const IndexMask mask,
const AttributeDomain domain,
ResourceScope &scope)
{
Span<MVert> verts{mesh.mvert, mesh.totvert};
Span<MEdge> edges{mesh.medge, mesh.totedge};
Span<MPoly> polys{mesh.mpoly, mesh.totpoly};
Span<MLoop> loops{mesh.mloop, mesh.totloop};
switch (domain) {
case ATTR_DOMAIN_FACE: {
return scope.add_value(mesh_face_normals(mesh, verts, polys, loops, mask), __func__).get();
}
case ATTR_DOMAIN_POINT: {
return scope.add_value(mesh_vertex_normals(mesh, verts, polys, loops, mask), __func__).get();
}
case ATTR_DOMAIN_EDGE: {
/* In this case, start with vertex normals and convert to the edge domain, since the
* conversion from edges to vertices is very simple. Use the full mask since the edges
* might use the vertex normal from any index. */
GVArrayPtr vert_normals = mesh_vertex_normals(
mesh, verts, polys, loops, IndexRange(verts.size()));
Span<float3> vert_normals_span = vert_normals->get_internal_span().typed<float3>();
Array<float3> edge_normals(mask.min_array_size());
/* Use "manual" domain interpolation instead of the GeometryComponent API to avoid
* calculating unnecessary values and to allow normalizing the result much more simply. */
for (const int i : mask) {
const MEdge &edge = edges[i];
edge_normals[i] = float3::interpolate(
vert_normals_span[edge.v1], vert_normals_span[edge.v2], 0.5f)
.normalized();
}
return &scope.construct<fn::GVArray_For_ArrayContainer<Array<float3>>>(
__func__, std::move(edge_normals));
}
case ATTR_DOMAIN_CORNER: {
/* The normals on corners are just the mesh's face normals, so start with the face normal
* array and copy the face normal for each of its corners. */
GVArrayPtr face_normals = mesh_face_normals(
mesh, verts, polys, loops, IndexRange(polys.size()));
/* In this case using the mesh component's generic domain interpolation is fine,
* since the face normal is just copied to every corner. */
GVArrayPtr loop_normals = mesh_component.attribute_try_adapt_domain(
std::move(face_normals), ATTR_DOMAIN_FACE, ATTR_DOMAIN_CORNER);
return scope.add_value(std::move(loop_normals), __func__).get();
}
default:
return nullptr;
}
}
class NormalFieldInput final : public fn::FieldInput {
public:
NormalFieldInput() : fn::FieldInput(CPPType::get<float3>(), "Normal")
{
}
const GVArray *try_get_varray_for_context(const fn::FieldContext &context,
IndexMask mask,
ResourceScope &scope) const final
{
if (const GeometryComponentFieldContext *geometry_context =
dynamic_cast<const GeometryComponentFieldContext *>(&context)) {
const GeometryComponent &component = geometry_context->geometry_component();
const AttributeDomain domain = geometry_context->domain();
if (component.type() == GEO_COMPONENT_TYPE_MESH) {
const MeshComponent &mesh_component = static_cast<const MeshComponent &>(component);
const Mesh *mesh = mesh_component.get_for_read();
if (mesh == nullptr) {
return nullptr;
}
return construct_mesh_normals_gvarray(mesh_component, *mesh, mask, domain, scope);
}
if (component.type() == GEO_COMPONENT_TYPE_CURVE) {
/* TODO: Add curve normals support. */
return nullptr;
}
}
return nullptr;
}
uint64_t hash() const override
{
/* Some random constant hash. */
return 669605641;
}
bool is_equal_to(const fn::FieldNode &other) const override
{
return dynamic_cast<const NormalFieldInput *>(&other) != nullptr;
}
};
static void geo_node_input_normal_exec(GeoNodeExecParams params)
{
Field<float3> normal_field{std::make_shared<NormalFieldInput>()};
params.set_output("Normal", std::move(normal_field));
}
} // namespace blender::nodes
void register_node_type_geo_input_normal()
{
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_INPUT_NORMAL, "Normal", NODE_CLASS_INPUT, 0);
ntype.geometry_node_execute = blender::nodes::geo_node_input_normal_exec;
ntype.declare = blender::nodes::geo_node_input_normal_declare;
nodeRegisterType(&ntype);
}
|
