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
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifdef WITH_OPENVDB
# include <openvdb/openvdb.h>
# include <openvdb/tools/Dense.h>
# include <openvdb/tools/LevelSetUtil.h>
# include <openvdb/tools/ParticlesToLevelSet.h>
#endif
#include "node_geometry_util.hh"
#include "DNA_mesh_types.h"
#include "BLI_task.hh"
#include "BKE_geometry_set.hh"
#include "BKE_lib_id.h"
#include "BKE_mesh.h"
#include "BKE_volume.h"
namespace blender::nodes::node_geo_volume_cube_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Float>(N_("Density"))
.description(N_("Volume density per voxel"))
.supports_field()
.default_value(1.0f);
b.add_input<decl::Float>(N_("Background"))
.description(N_("Value for voxels outside of the cube"));
b.add_input<decl::Vector>(N_("Min"))
.description(N_("Minimum boundary of volume"))
.default_value(float3(-1.0f));
b.add_input<decl::Vector>(N_("Max"))
.description(N_("Maximum boundary of volume"))
.default_value(float3(1.0f));
b.add_input<decl::Int>(N_("Resolution X"))
.description(N_("Number of voxels in the X axis"))
.default_value(32)
.min(2);
b.add_input<decl::Int>(N_("Resolution Y"))
.description(N_("Number of voxels in the Y axis"))
.default_value(32)
.min(2);
b.add_input<decl::Int>(N_("Resolution Z"))
.description(N_("Number of voxels in the Z axis"))
.default_value(32)
.min(2);
b.add_output<decl::Geometry>(N_("Volume"));
}
static float map(const float x,
const float in_min,
const float in_max,
const float out_min,
const float out_max)
{
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
class Grid3DFieldContext : public FieldContext {
private:
int3 resolution_;
float3 bounds_min_;
float3 bounds_max_;
public:
Grid3DFieldContext(const int3 resolution, const float3 bounds_min, const float3 bounds_max)
: resolution_(resolution), bounds_min_(bounds_min), bounds_max_(bounds_max)
{
}
int64_t points_num() const
{
return static_cast<int64_t>(resolution_.x) * static_cast<int64_t>(resolution_.y) *
static_cast<int64_t>(resolution_.z);
}
GVArray get_varray_for_input(const FieldInput &field_input,
const IndexMask UNUSED(mask),
ResourceScope &UNUSED(scope)) const
{
const bke::AttributeFieldInput *attribute_field_input =
dynamic_cast<const bke::AttributeFieldInput *>(&field_input);
if (attribute_field_input == nullptr) {
return {};
}
if (attribute_field_input->attribute_name() != "position") {
return {};
}
Array<float3> positions(this->points_num());
threading::parallel_for(IndexRange(resolution_.x), 1, [&](const IndexRange x_range) {
/* Start indexing at current X slice. */
int64_t index = x_range.start() * resolution_.y * resolution_.z;
for (const int64_t x_i : x_range) {
const float x = map(x_i, 0.0f, resolution_.x - 1, bounds_min_.x, bounds_max_.x);
for (const int64_t y_i : IndexRange(resolution_.y)) {
const float y = map(y_i, 0.0f, resolution_.y - 1, bounds_min_.y, bounds_max_.y);
for (const int64_t z_i : IndexRange(resolution_.z)) {
const float z = map(z_i, 0.0f, resolution_.z - 1, bounds_min_.z, bounds_max_.z);
positions[index] = float3(x, y, z);
index++;
}
}
}
});
return VArray<float3>::ForContainer(std::move(positions));
}
};
#ifdef WITH_OPENVDB
static void node_geo_exec(GeoNodeExecParams params)
{
const float3 bounds_min = params.extract_input<float3>("Min");
const float3 bounds_max = params.extract_input<float3>("Max");
const int3 resolution = int3(params.extract_input<int>("Resolution X"),
params.extract_input<int>("Resolution Y"),
params.extract_input<int>("Resolution Z"));
if (resolution.x < 2 || resolution.y < 2 || resolution.z < 2) {
params.error_message_add(NodeWarningType::Error, TIP_("Resolution must be greater than 1"));
params.set_default_remaining_outputs();
return;
}
if (bounds_min.x == bounds_max.x || bounds_min.y == bounds_max.y ||
bounds_min.z == bounds_max.z) {
params.error_message_add(NodeWarningType::Error,
TIP_("Bounding box volume must be greater than 0"));
params.set_default_remaining_outputs();
return;
}
const double3 scale_fac = double3(bounds_max - bounds_min) / double3(resolution - 1);
if (!BKE_volume_grid_determinant_valid(scale_fac.x * scale_fac.y * scale_fac.z)) {
params.error_message_add(NodeWarningType::Warning,
TIP_("Volume scale is lower than permitted by OpenVDB"));
params.set_default_remaining_outputs();
return;
}
Field<float> input_field = params.extract_input<Field<float>>("Density");
/* Evaluate input field on a 3D grid. */
Grid3DFieldContext context(resolution, bounds_min, bounds_max);
FieldEvaluator evaluator(context, context.points_num());
Array<float> densities(context.points_num());
evaluator.add_with_destination(std::move(input_field), densities.as_mutable_span());
evaluator.evaluate();
/* Store resulting values in openvdb grid. */
const float background = params.extract_input<float>("Background");
openvdb::FloatGrid::Ptr grid = openvdb::FloatGrid::create(background);
grid->setGridClass(openvdb::GRID_FOG_VOLUME);
openvdb::tools::Dense<float, openvdb::tools::LayoutZYX> dense_grid{
openvdb::math::CoordBBox({0, 0, 0}, {resolution.x - 1, resolution.y - 1, resolution.z - 1}),
densities.data()};
openvdb::tools::copyFromDense(dense_grid, *grid, 0.0f);
grid->transform().preTranslate(openvdb::math::Vec3<float>(-0.5f));
grid->transform().postScale(openvdb::math::Vec3<double>(scale_fac.x, scale_fac.y, scale_fac.z));
grid->transform().postTranslate(
openvdb::math::Vec3<float>(bounds_min.x, bounds_min.y, bounds_min.z));
Volume *volume = (Volume *)BKE_id_new_nomain(ID_VO, nullptr);
BKE_volume_init_grids(volume);
BKE_volume_grid_add_vdb(*volume, "density", std::move(grid));
GeometrySet r_geometry_set;
r_geometry_set.replace_volume(volume);
params.set_output("Volume", r_geometry_set);
}
#else
static void node_geo_exec(GeoNodeExecParams params)
{
params.error_message_add(NodeWarningType::Error,
TIP_("Disabled, Blender was compiled without OpenVDB"));
params.set_default_remaining_outputs();
}
#endif /* WITH_OPENVDB */
} // namespace blender::nodes::node_geo_volume_cube_cc
void register_node_type_geo_volume_cube()
{
namespace file_ns = blender::nodes::node_geo_volume_cube_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_VOLUME_CUBE, "Volume Cube", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
|
