I am experimenting with procedural textures, and I'd like to create a texture like
x = A.dot(orco-P0)
y = B.dot(orco-P0)
output = image[x][y]
It is not THAT hard to compute dot products in nodes (although it is a lot of clicking). The roadblock I am hitting is that the Image input has no input for coordinates.
How can I accomplish my mission in texture nodes? (This is using Blender Internal in case that wasn't clear from the subject line)