diff options
Diffstat (limited to 'source/blender/blenkernel/intern/geometry_component_curve.cc')
-rw-r--r-- | source/blender/blenkernel/intern/geometry_component_curve.cc | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/geometry_component_curve.cc b/source/blender/blenkernel/intern/geometry_component_curve.cc index 1e24b29038d..16edbc36f9c 100644 --- a/source/blender/blenkernel/intern/geometry_component_curve.cc +++ b/source/blender/blenkernel/intern/geometry_component_curve.cc @@ -14,6 +14,8 @@ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ +#include "BLI_task.hh" + #include "DNA_ID_enums.h" #include "DNA_curve_types.h" @@ -389,6 +391,98 @@ static const CurveEval *get_curve_from_component_for_read(const GeometryComponen namespace blender::bke { /* -------------------------------------------------------------------- */ +/** \name Curve Normals Access + * \{ */ + +static void calculate_bezier_normals(const BezierSpline &spline, MutableSpan<float3> normals) +{ + Span<int> offsets = spline.control_point_offsets(); + Span<float3> evaluated_normals = spline.evaluated_normals(); + for (const int i : IndexRange(spline.size())) { + normals[i] = evaluated_normals[offsets[i]]; + } +} + +static void calculate_poly_normals(const PolySpline &spline, MutableSpan<float3> normals) +{ + normals.copy_from(spline.evaluated_normals()); +} + +/** + * Because NURBS control points are not necessarily on the path, the normal at the control points + * is not well defined, so create a temporary poly spline to find the normals. This requires extra + * copying currently, but may be more efficient in the future if attributes have some form of CoW. + */ +static void calculate_nurbs_normals(const NURBSpline &spline, MutableSpan<float3> normals) +{ + PolySpline poly_spline; + poly_spline.resize(spline.size()); + poly_spline.positions().copy_from(spline.positions()); + poly_spline.tilts().copy_from(spline.tilts()); + normals.copy_from(poly_spline.evaluated_normals()); +} + +static Array<float3> curve_normal_point_domain(const CurveEval &curve) +{ + Span<SplinePtr> splines = curve.splines(); + Array<int> offsets = curve.control_point_offsets(); + const int total_size = offsets.last(); + Array<float3> normals(total_size); + + threading::parallel_for(splines.index_range(), 128, [&](IndexRange range) { + for (const int i : range) { + const Spline &spline = *splines[i]; + MutableSpan spline_normals{normals.as_mutable_span().slice(offsets[i], spline.size())}; + switch (splines[i]->type()) { + case Spline::Type::Bezier: + calculate_bezier_normals(static_cast<const BezierSpline &>(spline), spline_normals); + break; + case Spline::Type::Poly: + calculate_poly_normals(static_cast<const PolySpline &>(spline), spline_normals); + break; + case Spline::Type::NURBS: + calculate_nurbs_normals(static_cast<const NURBSpline &>(spline), spline_normals); + break; + } + } + }); + return normals; +} + +VArray<float3> curve_normals_varray(const CurveComponent &component, const AttributeDomain domain) +{ + const CurveEval *curve = component.get_for_read(); + if (curve == nullptr) { + return nullptr; + } + + if (domain == ATTR_DOMAIN_POINT) { + const Span<SplinePtr> splines = curve->splines(); + + /* Use a reference to evaluated normals if possible to avoid an allocation and a copy. + * This is only possible when there is only one poly spline. */ + if (splines.size() == 1 && splines.first()->type() == Spline::Type::Poly) { + const PolySpline &spline = static_cast<PolySpline &>(*splines.first()); + return VArray<float3>::ForSpan(spline.evaluated_normals()); + } + + Array<float3> normals = curve_normal_point_domain(*curve); + return VArray<float3>::ForContainer(std::move(normals)); + } + + if (domain == ATTR_DOMAIN_CURVE) { + Array<float3> point_normals = curve_normal_point_domain(*curve); + VArray<float3> varray = VArray<float3>::ForContainer(std::move(point_normals)); + return component.attribute_try_adapt_domain<float3>( + std::move(varray), ATTR_DOMAIN_POINT, ATTR_DOMAIN_CURVE); + } + + return nullptr; +} + +/** \} */ + +/* -------------------------------------------------------------------- */ /** \name Builtin Spline Attributes * * Attributes with a value for every spline, stored contiguously or in every spline separately. |