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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BKE_spline.hh"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_curve_primitive_spiral_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Int>(N_("Resolution"))
.default_value(32)
.min(1)
.max(1024)
.subtype(PROP_UNSIGNED)
.description(N_("Number of points in one rotation of the spiral"));
b.add_input<decl::Float>(N_("Rotations"))
.default_value(2.0f)
.min(0.0f)
.description(N_("Number of times the spiral makes a full rotation"));
b.add_input<decl::Float>(N_("Start Radius"))
.default_value(1.0f)
.subtype(PROP_DISTANCE)
.description(N_("Horizontal Distance from the Z axis at the start of the spiral"));
b.add_input<decl::Float>(N_("End Radius"))
.default_value(2.0f)
.subtype(PROP_DISTANCE)
.description(N_("Horizontal Distance from the Z axis at the end of the spiral"));
b.add_input<decl::Float>(N_("Height"))
.default_value(2.0f)
.subtype(PROP_DISTANCE)
.description(N_("The height perpendicular to the base of the spiral"));
b.add_input<decl::Bool>(N_("Reverse"))
.description(N_("Switch the direction from clockwise to counterclockwise"));
b.add_output<decl::Geometry>(N_("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 = std::max(int(resolution * rotations), 1);
const float delta_radius = (end_radius - start_radius) / (float)totalpoints;
const float delta_height = height / (float)totalpoints;
const float delta_theta = (M_PI * 2 * rotations) / (float)totalpoints *
(direction ? 1.0f : -1.0f);
spline->resize(totalpoints + 1);
MutableSpan<float3> positions = spline->positions();
spline->radii().fill(1.0f);
spline->tilts().fill(0.0f);
for (const int i : IndexRange(totalpoints + 1)) {
const float theta = i * delta_theta;
const float radius = start_radius + i * delta_radius;
const float x = radius * cos(theta);
const float y = radius * sin(theta);
const float z = delta_height * i;
positions[i] = {x, y, z};
}
curve->add_spline(std::move(spline));
curve->attributes.reallocate(curve->splines().size());
return curve;
}
static void node_geo_exec(GeoNodeExecParams params)
{
const float rotations = std::max(params.extract_input<float>("Rotations"), 0.0f);
if (rotations == 0.0f) {
params.set_default_remaining_outputs();
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::node_geo_curve_primitive_spiral_cc
void register_node_type_geo_curve_primitive_spiral()
{
namespace file_ns = blender::nodes::node_geo_curve_primitive_spiral_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_CURVE_PRIMITIVE_SPIRAL, "Spiral", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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