Geometry Nodes: Curve Sample Node

This node allows sampling positions, tangents, and normals at any
arbitrary point along a curve. The curve can include multiple splines,
all are taken into account. The node does not yet support transferring
generic attributes like radius, because some more general tooling will
make that much more feasible and useful in different scenarios.

This is a field node, so it is evaluated in the context of a data-flow
node like "Set Position". One nice thing about that is it can easily
be used to move an entire geometry like the follow path constraint.

The point along the curve is chosen either with a factor of the total
length of the curve, or a length into the curve, the same choice used
in the curve trim node.

Differential Revision: https://developer.blender.org/D12565

1 files changed, 17 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/curve_eval.cc b/source/blender/blenkernel/intern/curve_eval.cc
index ea84766943d..8eec7f5dfab 100644
--- a/source/blender/blenkernel/intern/curve_eval.cc
+++ b/source/blender/blenkernel/intern/curve_eval.cc
@@ -143,6 +143,23 @@ blender::Array<int> CurveEval::evaluated_point_offsets() const
   return offsets;
 }
 
+/**
+ * Return the accumulated length at the start of every spline in the curve.
+ *
+ * \note The result is one longer than the spline count; the last element is the total length.
+ */
+blender::Array<float> CurveEval::accumulated_spline_lengths() const
+{
+  Array<float> spline_lengths(splines_.size() + 1);
+  float spline_length = 0.0f;
+  for (const int i : splines_.index_range()) {
+    spline_lengths[i] = spline_length;
+    spline_length += splines_[i]->length();
+  }
+  spline_lengths.last() = spline_length;
+  return spline_lengths;
+}
+
 static BezierSpline::HandleType handle_type_from_dna_bezt(const eBezTriple_Handle dna_handle_type)
 {
   switch (dna_handle_type) {