try this entry from zach's blog http://buildz.blogspot.com/2010/07/orthogonal-on-placement-making-brick.html
best,
lira

I have a post here that deals with a slight variation on this project here:
...

Here is a quick way to create the wall with PanelingTools for Rhino. Once you create the brick module and wavy surface:
- Generate a surface grid with ptGridCurve.
- Populate the module with ptOrientToGrid.

Here's a brick wall definition with Grasshopper 8.003. The bricks are instantiated normal to the surface on a grid of points. The parameters are a reference surface and the brick dimensions. I am interested in taking this another step further and...

Here's a quick example of how to do this in DP. The bricks are all normal to the surface at their centroid. The horizontal spacing is managed by a parameter as well as the overall surface dims, brick dims, etc... This example uses a UDF for the...