feat: P1 complete - geodesic, CDT, NURBS surface

include/vde/mesh/cdt_2d.h

@@ -0,0 +1,14 @@
+#pragma once
+#include "vde/mesh/delaunay_2d.h"
+#include "vde/core/line.h"
+#include <vector>
+
+namespace vde::mesh {
+
+/// Constrained Delaunay Triangulation (CDT) in 2D
+/// Ensures specified constraint edges appear in the triangulation
+DelaunayResult constrained_delaunay_2d(
+    const std::vector<Point2D>& points,
+    const std::vector<std::pair<int, int>>& constraints);
+
+}  // namespace vde::mesh

include/vde/mesh/geodesic.h

@@ -0,0 +1,15 @@
+#pragma once
+#include "vde/mesh/halfedge_mesh.h"
+#include <vector>
+
+namespace vde::mesh {
+
+/// Geodesic distance from source vertices using the Heat Method (Crane et al. 2013)
+/// Returns per-vertex distance from the nearest source
+/// @param sources  Source vertex indices
+/// @param t        Time step (default = average edge length squared)
+std::vector<double> geodesic_distance(const HalfedgeMesh& mesh,
+                                      const std::vector<int>& sources,
+                                      double t = -1.0);
+
+}  // namespace vde::mesh