Add torodial surface example

Author: Onur Rauf Bingol

surface/ex_torus.cptw

@@ -0,0 +1,9 @@
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surface/ex_torus.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+    Examples for the NURBS-Python Package
+    Released under MIT License
+    Developed by Onur Rauf Bingol (c) 2018
+
+    Toroidal surface is contributed by Harshil Shah (@harshilsofeshah)
+"""
+
+import os
+from geomdl import NURBS
+from geomdl import exchange
+from geomdl.visualization import VisMPL
+
+
+# Fix file path
+os.chdir(os.path.dirname(os.path.realpath(__file__)))
+
+# Create a NURBS surface instance
+surf = NURBS.Surface()
+
+# Set degress
+surf.degree_u = 2
+surf.degree_v = 2
+
+# Set control points
+surf.set_ctrlpts(*exchange.import_txt("ex_torus.cptw", two_dimensional=True))
+
+# Set knot vectors
+surf.knotvector_u = [0, 0, 0, 0.25, 0.25, 0.5, 0.5, 0.75, 0.75, 1, 1, 1]
+surf.knotvector_v = [0, 0, 0, 0.25, 0.25, 0.5, 0.5, 0.75, 0.75, 1, 1, 1]
+
+# Set sample size and evaluate surface
+surf.sample_size = 25
+surf.evaluate()
+
+# Import colormaps
+from matplotlib import cm
+
+# Plot the surface
+vis_config = VisMPL.VisConfig(ctrlpts=True, axes=True, legend=False)
+vis_comp = VisMPL.VisSurfTriangle(vis_config)
+surf.vis = vis_comp
+surf.render(colormap=cm.coolwarm)
+
+# Good to have something here to put a breakpoint
+pass