fixed c-extension for solid models

Author: thearn

examples.py

@@ -21,7 +21,7 @@
 A =  A[:, :, 0] + 1.*A[:,:, 3] # Compose some elements from RGBA to give depth
 A = gaussian_filter(A, 2)  # smoothing
 numpy2stl(A, "examples/OpenMDAO-logo.stl",
-          scale=0.05, mask_val=1., solid=False)
+          scale=0.05, mask_val=1., solid=True)
 
 text = ("$\oint_{\Gamma} (A\, dx + B\, dy) = \iint_{U} \left(\\frac{\partial "
         "B}{\partial x} - \\frac{\partial A}{\partial y}\\right)\ dxdy$ \n\n "
@@ -33,5 +33,5 @@
 A = 256 * imread("examples/Greens-Theorem_Navier-Stokes.png")
 A = A.mean(axis=2)  # grayscale projection
 A = gaussian_filter(A.max() - A, 1.0)
-numpy2stl(A, "examples/Greens-Theorem_Navier-Stokes.stl", scale=0.2,
+numpy2stl(A, "examples/Greens-Theorem_Navier-Stokes.stl", scale=0.15,
                                                          mask_val=5.)