added partial implementation of Brep.to_viewmesh()

Author: chenkasirer

CHANGELOG.md

@@ -37,6 +37,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added implementation for `Brep.from_pipe` in `compas_rhino.geometry.RhinoBrep`.
 * Added implementation for `Brep.from_iges` in `compas_rhino.geometry.RhinoBrep`.
 * Added implementation for `Brep.to_step` in `compas_rhino.geometry.RhinoBrep`.
+* Added implementation for `Brep.to_viewmesh()` in `compas_rhino.geometry.RhinoBrep`.
 
 ### Changed
 

src/compas_rhino/geometry/brep/brep.py

@@ -6,6 +6,7 @@
 import rhinoscriptsyntax as rs  # type: ignore
 
 import compas_rhino.objects
+from compas.datastructures import Mesh
 from compas.geometry import Brep
 from compas.geometry import BrepError
 from compas.geometry import BrepFilletError
@@ -61,6 +62,13 @@ def _import_brep_from_file(filepath):
     return RhinoBrep.from_native(geometry)
 
 
+def _join_meshes(meshes):
+    result = Mesh()
+    for mesh in meshes:
+        result.join(mesh)
+    return result
+
+
 class RhinoBrep(Brep):
     """Rhino Brep backend class.
 
@@ -862,6 +870,26 @@ def to_meshes(self, u=16, v=16):
         meshes = [mesh_to_compas(m) for m in rg_meshes]
         return meshes
 
+    def to_viewmesh(self, linear_deflection: float = 0.001):
+        """
+        Convert the Brep to a single view mesh.
+
+        Note
+        ----
+        Edges as polylines is not currently implemented for RhinoBrep. Therefore, an empty list will be returned.
+
+        Parameters
+        ----------
+        linear_deflection : float, optional
+            The maximum linear deflection between the geometry and its discrete representation.
+
+        Returns
+        -------
+        tuple[:class:`compas.datastructures.Mesh`, list[:class:`compas.geometry.Polyline`]]
+
+        """
+        return _join_meshes(self.to_meshes()), []
+
     def to_step(self, filepath):
         if not filepath.endswith(".step"):
             raise ValueError("Attempted to export STEP but file ends with {} extension".format(filepath.split(".")[-1]))