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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_star_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Int>(N_("Points"))
.default_value(8)
.min(3)
.max(256)
.subtype(PROP_UNSIGNED)
.description(N_("Number of points on each of the circles"));
b.add_input<decl::Float>(N_("Inner Radius"))
.default_value(1.0f)
.min(0.0f)
.subtype(PROP_DISTANCE)
.description(N_("Radius of the inner circle; can be larger than outer radius"));
b.add_input<decl::Float>(N_("Outer Radius"))
.default_value(2.0f)
.min(0.0f)
.subtype(PROP_DISTANCE)
.description(N_("Radius of the outer circle; can be smaller than inner radius"));
b.add_input<decl::Float>(N_("Twist"))
.subtype(PROP_ANGLE)
.description(N_("The counterclockwise rotation of the inner set of points"));
b.add_output<decl::Geometry>(N_("Curve"));
b.add_output<decl::Bool>(N_("Outer Points"))
.field_source()
.description(N_("An attribute field with a selection of the outer points"));
}
static std::unique_ptr<CurveEval> create_star_curve(const float inner_radius,
const float outer_radius,
const float twist,
const int points)
{
std::unique_ptr<CurveEval> curve = std::make_unique<CurveEval>();
std::unique_ptr<PolySpline> spline = std::make_unique<PolySpline>();
spline->set_cyclic(true);
spline->resize(points * 2);
MutableSpan<float3> positions = spline->positions();
spline->radii().fill(1.0f);
spline->tilts().fill(0.0f);
const float theta_step = (2.0f * M_PI) / float(points);
for (const int i : IndexRange(points)) {
const float x = outer_radius * cos(theta_step * i);
const float y = outer_radius * sin(theta_step * i);
positions[i * 2] = {x, y, 0.0f};
const float inner_x = inner_radius * cos(theta_step * i + theta_step * 0.5f + twist);
const float inner_y = inner_radius * sin(theta_step * i + theta_step * 0.5f + twist);
positions[i * 2 + 1] = {inner_x, inner_y, 0.0f};
}
curve->add_spline(std::move(spline));
curve->attributes.reallocate(curve->splines().size());
return curve;
}
static void create_selection_output(CurveComponent &component,
StrongAnonymousAttributeID &r_attribute)
{
OutputAttribute_Typed<bool> attribute = component.attribute_try_get_for_output_only<bool>(
r_attribute.get(), ATTR_DOMAIN_POINT);
MutableSpan<bool> selection = attribute.as_span();
for (int i : selection.index_range()) {
selection[i] = i % 2 == 0;
}
attribute.save();
}
static void node_geo_exec(GeoNodeExecParams params)
{
std::unique_ptr<CurveEval> curve = create_star_curve(
std::max(params.extract_input<float>("Inner Radius"), 0.0f),
std::max(params.extract_input<float>("Outer Radius"), 0.0f),
params.extract_input<float>("Twist"),
std::max(params.extract_input<int>("Points"), 3));
GeometrySet output = GeometrySet::create_with_curve(curve.release());
if (params.output_is_required("Outer Points")) {
StrongAnonymousAttributeID attribute_output("Outer Points");
create_selection_output(output.get_component_for_write<CurveComponent>(), attribute_output);
params.set_output("Outer Points",
AnonymousAttributeFieldInput::Create<bool>(
std::move(attribute_output), params.attribute_producer_name()));
}
params.set_output("Curve", std::move(output));
}
} // namespace blender::nodes::node_geo_curve_primitive_star_cc
void register_node_type_geo_curve_primitive_star()
{
namespace file_ns = blender::nodes::node_geo_curve_primitive_star_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_CURVE_PRIMITIVE_STAR, "Star", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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