wxGUI/vdigit: note todo for rendering

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@48001 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_modules/wxvdigit.py

@@ -10,6 +10,13 @@ List of classes:
  - VDigitError
  - IVDigit
 
+@todo Read large amounts of data from Vlib into arrays, which could
+then be processed using NumPy and rendered using glDrawArrays or
+glDrawElements, so no per-line/per-vertex processing in Python. Bulk
+data processing with NumPy is much faster than iterating in Python
+(and NumPy would be an excellent candidate for acceleration via
+e.g. OpenCL or CUDA; I'm surprised it hasn't happened already).
+
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