Fix: nurbs basis cache not computed before it is used

3 files changed, 10 insertions, 2 deletions

diff --git a/source/blender/blenkernel/BKE_curves.hh b/source/blender/blenkernel/BKE_curves.hh
index 568899721a9..2b9b13d1d2b 100644
--- a/source/blender/blenkernel/BKE_curves.hh
+++ b/source/blender/blenkernel/BKE_curves.hh
@@ -338,12 +338,14 @@ class CurvesGeometry : public ::CurvesGeometry {
   /** Calculates the data described by #evaluated_lengths_for_curve if necessary. */
   void ensure_evaluated_lengths() const;
 
+  void ensure_can_interpolate_to_evaluated() const;
+
   /**
    * Evaluate a generic data to the standard evaluated points of a specific curve,
    * defined by the resolution attribute or other factors, depending on the curve type.
    *
    * \warning This function expects offsets to the evaluated points for each curve to be
-   * calculated. That can be ensured with #ensure_evaluated_offsets.
+   * calculated. That can be ensured with #ensure_can_interpolate_to_evaluated.
    */
   void interpolate_to_evaluated(int curve_index, GSpan src, GMutableSpan dst) const;
   /**
diff --git a/source/blender/blenkernel/intern/curves_geometry.cc b/source/blender/blenkernel/intern/curves_geometry.cc
index 6486be4afe0..ef4a4ee1d6b 100644
--- a/source/blender/blenkernel/intern/curves_geometry.cc
+++ b/source/blender/blenkernel/intern/curves_geometry.cc
@@ -938,6 +938,12 @@ void CurvesGeometry::ensure_evaluated_lengths() const
   this->runtime->length_cache_dirty = false;
 }
 
+void CurvesGeometry::ensure_can_interpolate_to_evaluated() const
+{
+  this->ensure_evaluated_offsets();
+  this->ensure_nurbs_basis_cache();
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */
diff --git a/source/blender/geometry/intern/resample_curves.cc b/source/blender/geometry/intern/resample_curves.cc
index d61941aa071..cac6d69f58c 100644
--- a/source/blender/geometry/intern/resample_curves.cc
+++ b/source/blender/geometry/intern/resample_curves.cc
@@ -368,7 +368,7 @@ Curves *resample_to_evaluated(const CurveComponent &src_component,
   dst_curves.fill_curve_types(selection, CURVE_TYPE_POLY);
   MutableSpan<int> dst_offsets = dst_curves.offsets_for_write();
 
-  src_curves.ensure_evaluated_offsets();
+  src_curves.ensure_can_interpolate_to_evaluated();
   threading::parallel_for(selection.index_range(), 4096, [&](IndexRange range) {
     for (const int i : selection.slice(range)) {
       dst_offsets[i] = src_curves.evaluated_points_for_curve(i).size();