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/*
* 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 "node_geometry_util.hh"
namespace blender::nodes {
static void geo_node_bounding_box_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>("Geometry");
b.add_output<decl::Geometry>("Bounding Box");
b.add_output<decl::Vector>("Min");
b.add_output<decl::Vector>("Max");
}
static void geo_node_bounding_box_exec(GeoNodeExecParams params)
{
GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry");
/* Compute the min and max of all realized geometry for the two
* vector outputs, which are only meant to consider real geometry. */
float3 min = float3(FLT_MAX);
float3 max = float3(-FLT_MAX);
geometry_set.compute_boundbox_without_instances(&min, &max);
if (min == float3(FLT_MAX)) {
params.set_output("Min", float3(0));
params.set_output("Max", float3(0));
}
else {
params.set_output("Min", min);
params.set_output("Max", max);
}
/* Generate the bounding box meshes inside each unique geometry set (including individually for
* every instance). Because geometry components are reference counted anyway, we can just
* repurpose the original geometry sets for the output. */
if (params.output_is_required("Bounding Box")) {
geometry_set.modify_geometry_sets([&](GeometrySet &sub_geometry) {
float3 sub_min = float3(FLT_MAX);
float3 sub_max = float3(-FLT_MAX);
/* Reuse the min and max calculation if this is the main "real" geometry set. */
if (&sub_geometry == &geometry_set) {
sub_min = min;
sub_max = max;
}
else {
sub_geometry.compute_boundbox_without_instances(&sub_min, &sub_max);
}
if (sub_min == float3(FLT_MAX)) {
sub_geometry.keep_only({GEO_COMPONENT_TYPE_INSTANCES});
}
else {
const float3 scale = sub_max - sub_min;
const float3 center = sub_min + scale / 2.0f;
Mesh *mesh = create_cuboid_mesh(scale, 2, 2, 2);
transform_mesh(*mesh, center, float3(0), float3(1));
sub_geometry.replace_mesh(mesh);
sub_geometry.keep_only({GEO_COMPONENT_TYPE_MESH, GEO_COMPONENT_TYPE_INSTANCES});
}
});
params.set_output("Bounding Box", std::move(geometry_set));
}
}
} // namespace blender::nodes
void register_node_type_geo_bounding_box()
{
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_BOUNDING_BOX, "Bounding Box", NODE_CLASS_GEOMETRY, 0);
ntype.declare = blender::nodes::geo_node_bounding_box_declare;
ntype.geometry_node_execute = blender::nodes::geo_node_bounding_box_exec;
nodeRegisterType(&ntype);
}
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