Added a function to set colors and transparency.

CadQuery/Helpers.py

@@ -0,0 +1,24 @@
+def show(cqObject, rgba=(204, 204, 204, 0.0)):
+    import FreeCAD
+    from random import random
+
+    #Convert our rgba values
+    r = rgba[0] / 255.0
+    g = rgba[1] / 255.0
+    b = rgba[2] / 255.0
+    a = int(rgba[3] * 100.0)
+
+    ad = FreeCAD.activeDocument()
+
+    #Generate a random name for this shape in case we are doing multiple shapes
+    newName = "Shape" + str(random())
+
+    #Set up the feature in the tree so we can manipulate its properties
+    newFeature = ad.addObject("Part::Feature", newName)
+
+    #Change our shape's properties accordingly
+    newFeature.ViewObject.ShapeColor = (r, g, b)
+    newFeature.ViewObject.Transparency = a
+    newFeature.Shape = cqObject.toFreecad()
+
+    ad.recompute()