Differential D14211 Diff 48776 source/blender/editors/curves/intern/curves_add.cc

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source/blender/editors/curves/intern/curves_add.cc

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				/* SPDX-License-Identifier: GPL-2.0-or-later */

				/** \file
				* \ingroup edcurves
				*/

				#include "BLI_rand.hh"

				#include "BKE_curves.hh"

				#include "ED_curves.h"

				namespace blender::ed::curves {

				bke::CurvesGeometry primitive_random_sphere(const int curves_size, const int points_per_curve)
				{
				bke::CurvesGeometry curves(points_per_curve * curves_size, curves_size);

				MutableSpan<int> offsets = curves.offsets();
				MutableSpan<float3> positions = curves.positions();

				float radius_data = (float )CustomData_add_layer_named(
				&curves.point_data, CD_PROP_FLOAT, CD_DEFAULT, nullptr, curves.point_size, "radius");
				MutableSpan<float> radii{radius_data, curves.points_size()};

				for (const int i : offsets.index_range()) {
				offsets[i] = points_per_curve * i;
				}

				RandomNumberGenerator rng;

				for (const int i : curves.curves_range()) {
				const IndexRange curve_range = curves.range_for_curve(i);
				MutableSpan<float3> curve_positions = positions.slice(curve_range);
				MutableSpan<float> curve_radii = radii.slice(curve_range);

				const float theta = 2.0f * M_PI * rng.get_float();
				const float phi = saacosf(2.0f * rng.get_float() - 1.0f);

				float3 no = {std::sin(theta) * std::sin(phi), std::cos(theta) * std::sin(phi), std::cos(phi)};
				no = math::normalize(no);

				float3 co = no;
				for (int key = 0; key < points_per_curve; key++) {
				float t = key / (float)(points_per_curve - 1);
				curve_positions[key] = co;
				curve_radii[key] = 0.02f * (1.0f - t);

				float3 offset = float3(rng.get_float(), rng.get_float(), rng.get_float()) * 2.0f - 1.0f;
				co += (offset + no) / points_per_curve;
				}
				}

				return curves;
				}

				} // namespace blender::ed::curves