2d pattern weld and simplification

CHANGELOG.md

@@ -18,8 +18,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added simplified borders to map_mesh function.
+- Added fixed points to map_mesh function.
+
 ### Changed
 
+- Fixed point welding bug in map_mesh function.
+- Changed example_isolines to work with the new compas_viewer.
 - GA for cibuildwheel, bring back the tessagon test.
 
 ### Removed

CMakeLists.txt

@@ -4,7 +4,7 @@ project(compas_libigl LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-option(ENABLE_PRECOMPILED_HEADERS "Enable precompiled headers" OFF)
+option(ENABLE_PRECOMPILED_HEADERS "Enable precompiled headers" ON)
 option(MULTITHREADED_COMPILATION "Enable multi-threaded compilation (Ninja only)" ON)
 
 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)

docs/examples/example_isolines.py

@@ -53,6 +53,7 @@
 
 for i, isolines in enumerate(isolines):
     color = cmap(values[i], minval, maxval)
-    viewer.scene.add(isolines, linecolor=color, linewidth=3)
+    for isoline in isolines:
+        viewer.scene.add(isoline, linecolor=color, linewidth=3)
 
 viewer.show()

docs/examples/example_mapping_patterns.py

@@ -1,6 +1,7 @@
 from pathlib import Path
 
 from compas.colors import Color
+from compas.geometry import Point
 from compas.datastructures import Mesh
 from compas_viewer import Viewer
 from compas_viewer.config import Config
@@ -15,16 +16,31 @@
 
 mesh = Mesh.from_obj(Path(__file__).parent.parent.parent / "data" / "minimal_surface.obj")
 
+
+
 for vertex in mesh.vertices():
     x, y, z = mesh.vertex_attributes(vertex, "xyz")  # type: ignore
     mesh.vertex_attributes(vertex, "xyz", [x, -z, y])
 
 # ==============================================================================
-# Mapping: 3D Mesh, 2D Pattern, UV
+# Get Lowest and Highest points
 # ==============================================================================
 
-mesh_mapped = map_pattern_to_mesh("ZigZag", mesh, clip_boundaries=True, tolerance=1e-6, pattern_u=16, pattern_v=16)
+aabb = mesh.aabb()
+fixed_points = []
+
+
+for vertex in mesh.vertices():
+    x, y, z = mesh.vertex_attributes(vertex, "xyz")  # type: ignore
+    if abs(z-aabb.zmin) < 1e-3 or abs(z-aabb.zmax) < 1e-3:
+        fixed_points.append(vertex)
+
+# ==============================================================================
+# Mapping: 3D Mesh, 2D Pattern, UV
+# ==============================================================================
 
+mesh_mapped0 = map_pattern_to_mesh("ZigZag", mesh, clip_boundaries=True, tolerance=1e-6, pattern_u=16, pattern_v=16, simplify_borders=True, fixed_points=fixed_points)
+mesh_mapped1 = map_pattern_to_mesh("ZigZag", mesh, clip_boundaries=True, tolerance=1e-6, pattern_u=16, pattern_v=16, simplify_borders=False)
 # ==============================================================================
 # Viewer
 # ==============================================================================
@@ -35,7 +51,11 @@
 
 viewer = Viewer(config=config)
 
-# viewer.scene.add(mesh, name="mesh", show_faces=False, linecolor=Color.grey(), opacity=0.2)
-viewer.scene.add(mesh_mapped, name="mesh_mapped", facecolor=Color.red())
+viewer.scene.add(mesh, name="mesh", show_faces=False, linecolor=Color.grey(), opacity=0.2)
+viewer.scene.add(mesh_mapped0, name="mesh_mapped0", facecolor=Color.red(), show_points=True)
+# viewer.scene.add(mesh_mapped1, name="mesh_mapped1", facecolor=Color.blue(), show_points=True, show_faces=False)
+
+for p in fixed_points:
+    viewer.scene.add(mesh.vertex_point(p), pointcolor=Color.red(), pointsize=10)
 
 viewer.show()

src/compas_libigl/mapping.py

@@ -26,7 +26,7 @@
 from compas_libigl._types_std import VectorVectorInt  # noqa: F401
 
 
-def map_mesh(target_mesh, pattern_mesh, clip_boundaries=True, tolerance=1e-6):
+def map_mesh(target_mesh, pattern_mesh, clip_boundaries=True, simplify_borders=True, fixed_points=None, tolerance=1e-6):
     """
     Map a 2D pattern mesh onto a 3D target.
 
@@ -38,6 +38,10 @@ def map_mesh(target_mesh, pattern_mesh, clip_boundaries=True, tolerance=1e-6):
         A tuple of (vertices, faces) representing the pattern mesh.
     clip_boundaries : bool
         Whether to clip the pattern mesh to the boundaries of the target mesh.
+    simplify_borders : bool
+        Whether to simplify the border of the pattern mesh.
+    fixed_points : list[list[float]]
+        A list of fixed points on the target mesh.
     tolerance : float
         The tolerance for point comparison, to remove duplicates.
 
@@ -61,16 +65,30 @@ def map_mesh(target_mesh, pattern_mesh, clip_boundaries=True, tolerance=1e-6):
     f_numpy = np.array(f, dtype=np.int32)
     pattern_v_numpy = np.array(pv, dtype=np.float64)
 
+    # Handle fixed_points - provide empty array if None
+
+    fixed_points_vectorint = VectorInt()
+    if fixed_points is None:
+        fixed_points_vectorint = VectorInt()
+    else:
+        fixed_points_vectorint = VectorInt(fixed_points)
+
+    # Convert pattern_f from Python list to VectorVectorInt which is expected by C++ code
+
+    pattern_f_vec = VectorVectorInt()
+    for face in pf:
+        pattern_f_vec.append(face)
+
     # Perform the mapping
     pv_numpy_copy, pf_numpy_cleaned, p_normals, pattern_is_boundary, pattern_groups = _mapping.map_mesh_with_automatic_parameterization(
-        v_numpy, f_numpy, pattern_v_numpy, pf, clip_boundaries, tolerance
+        v_numpy, f_numpy, pattern_v_numpy, pattern_f_vec, clip_boundaries, simplify_borders, fixed_points_vectorint, tolerance
     )
 
     # Return the result as a tuple
     return pv_numpy_copy, pf_numpy_cleaned, p_normals, pattern_is_boundary, pattern_groups
 
 
-def map_pattern_to_mesh(name, mesh, clip_boundaries=True, tolerance=1e-6, pattern_u=16, pattern_v=16):
+def map_pattern_to_mesh(name, mesh, clip_boundaries=True, tolerance=1e-6, pattern_u=16, pattern_v=16, simplify_borders=True, fixed_points=None):
     """
     Map a 2D pattern mesh onto a 3D target.
 
@@ -108,6 +126,10 @@ def map_pattern_to_mesh(name, mesh, clip_boundaries=True, tolerance=1e-6, patter
         The number of pattern vertices in the u direction.
     pattern_v : int
         The number of pattern vertices in the v direction.
+    simplify_borders : bool
+        Whether to simplify the border of the pattern mesh.
+    fixed_points : list[list[float]]
+        A list of fixed points on the target mesh.
 
     Returns
     -------
@@ -165,6 +187,8 @@ def map_pattern_to_mesh(name, mesh, clip_boundaries=True, tolerance=1e-6, patter
     pf = tessagon_mesh["face_list"]
 
     v, f = mesh.to_vertices_and_faces()
-    mapped_vertices, mapped_faces, mapped_normals, mapped_is_boundary, mapped_groups = map_mesh((v, f), (pv, pf), clip_boundaries=clip_boundaries, tolerance=tolerance)
+    mapped_vertices, mapped_faces, mapped_normals, mapped_is_boundary, mapped_groups = map_mesh(
+        (v, f), (pv, pf), clip_boundaries=clip_boundaries, simplify_borders=simplify_borders, fixed_points=fixed_points, tolerance=tolerance
+    )
 
     return Mesh.from_vertices_and_faces(mapped_vertices, mapped_faces)