After having browsed on the Internet and I came across a website. I intend to project directly straight onto the Duke Street walls but if something was to prevent me from doing this, such as a obstacle/object then this is how I could overcome the problem.
Projection on a flat surface
'If your projection target is a flat surface, like a wall and your projector is at an arbitraty position, not exactly facing the part of the wall you want to project to, the projected image looks distorted. Using Homography (Transform 2d) you can easily pre-distort the image you project so that it appears undistorted on the surface. Note: Like this you can always get a correctly looking projected image on a flat surface independent of the projectors position, orientation to the surface and its lens characteristics.'
All information taken from the link http://vvvv.org/documentation/how-to-project-on-3d-geometry
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