Update surface examples 2 and 3

Author: Onur R. Bingol

surface/ex_surface02.py

@@ -23,7 +23,7 @@
 surf = BSpline.Surface()
 
 # Set evaluation delta
-surf.delta = 0.05
+surf.delta = 0.025
 
 # Set up surface
 surf.read_ctrlpts_from_txt("ex_surface02.cpt")
@@ -37,13 +37,13 @@
 
 # Draw the control point grid and the evaluated surface
 if render_surf:
-    vis_comp = VisMPL.VisTriSurf()
+    vis_comp = VisMPL.VisSurfScatter()
     surf.vis = vis_comp
     surf.render()
 
 # Save control points and evaluated curve points
-surf.save_surfpts_to_csv("surfpts02_orig.csv")
-surf.save_ctrlpts_to_csv("ctrlpts02_orig.csv")
+surf.save_surfpts_to_csv("surfpts02_orig.csv", mode='linear')
+surf.save_ctrlpts_to_csv("ctrlpts02_orig.csv", mode='wireframe')
 
 # Evaluate 1st order surface derivative at the given u and v
 u = 0.2

surface/ex_surface03.py

@@ -10,14 +10,21 @@
 import os
 from geomdl import NURBS
 
+# Try to load the visualization module
+try:
+    render_surf = True
+    from geomdl.visualization import VisMPL
+except ImportError:
+    render_surf = False
+
 # Fix file path
 os.chdir(os.path.dirname(os.path.realpath(__file__)))
 
 # Create a NURBS surface instance
 surf = NURBS.Surface()
 
 # Set evaluation delta
-surf.delta = 0.05
+surf.delta = 0.025
 
 # Set up surface
 surf.read_ctrlpts_from_txt("ex_surface03.cptw")
@@ -29,6 +36,12 @@
 # Evaluate surface
 surf.evaluate()
 
+# Draw the control point grid and the evaluated surface
+if render_surf:
+    vis_comp = VisMPL.VisSurfWireframe()
+    surf.vis = vis_comp
+    surf.render()
+
 # Save control points and evaluated curve points
 surf.save_surfpts_to_csv("surfpts03_orig.csv", mode='wireframe')
 surf.save_ctrlpts_to_csv("ctrlpts03_orig.csv")