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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 "BKE_spline.hh"
#include "node_geometry_util.hh"
namespace blender::nodes {
static void geo_node_curve_primitive_spiral_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Int>("Resolution").default_value(32).min(1).max(1024).subtype(PROP_UNSIGNED);
b.add_input<decl::Float>("Rotations").default_value(2.0f).min(0.0f);
b.add_input<decl::Float>("Start Radius").default_value(1.0f).subtype(PROP_DISTANCE);
b.add_input<decl::Float>("End Radius").default_value(2.0f).subtype(PROP_DISTANCE);
b.add_input<decl::Float>("Height").default_value(2.0f).subtype(PROP_DISTANCE);
b.add_input<decl::Bool>("Reverse");
b.add_output<decl::Geometry>("Curve");
}
static std::unique_ptr<CurveEval> create_spiral_curve(const float rotations,
const int resolution,
const float start_radius,
const float end_radius,
const float height,
const bool direction)
{
std::unique_ptr<CurveEval> curve = std::make_unique<CurveEval>();
std::unique_ptr<PolySpline> spline = std::make_unique<PolySpline>();
const int totalpoints = resolution * rotations;
const float delta_radius = (end_radius - start_radius) / (float)totalpoints;
float radius = start_radius;
const float delta_height = height / (float)totalpoints;
const float delta_theta = (M_PI * 2 * rotations) / (float)totalpoints;
float theta = 0.0f;
for (const int i : IndexRange(totalpoints + 1)) {
const float x = radius * cos(theta);
const float y = radius * sin(theta);
const float z = delta_height * i;
spline->add_point(float3(x, y, z), 1.0f, 0.0f);
radius += delta_radius;
if (direction) {
theta += delta_theta;
}
else {
theta -= delta_theta;
}
}
spline->attributes.reallocate(spline->size());
curve->add_spline(std::move(spline));
curve->attributes.reallocate(curve->splines().size());
return curve;
}
static void geo_node_curve_primitive_spiral_exec(GeoNodeExecParams params)
{
const float rotations = std::max(params.extract_input<float>("Rotations"), 0.0f);
if (rotations == 0.0f) {
params.set_output("Curve", GeometrySet());
return;
}
std::unique_ptr<CurveEval> curve = create_spiral_curve(
rotations,
std::max(params.extract_input<int>("Resolution"), 1),
params.extract_input<float>("Start Radius"),
params.extract_input<float>("End Radius"),
params.extract_input<float>("Height"),
params.extract_input<bool>("Reverse"));
params.set_output("Curve", GeometrySet::create_with_curve(curve.release()));
}
} // namespace blender::nodes
void register_node_type_geo_curve_primitive_spiral()
{
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_CURVE_PRIMITIVE_SPIRAL, "Spiral", NODE_CLASS_GEOMETRY, 0);
ntype.declare = blender::nodes::geo_node_curve_primitive_spiral_declare;
ntype.geometry_node_execute = blender::nodes::geo_node_curve_primitive_spiral_exec;
nodeRegisterType(&ntype);
}
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