I'm reading an article on building point set surfaces (paper is here). It contains...
Step 1 of the projection procedure is a non-linear optimization problem. By setting $q = r + tn$ for some $t ∈ \Re$, equation (1) above [not shown] can be rewritten as: $$\sum_{i=0}^n\langle{n,p_i-r-tn}\rangle^2\theta(\Vert{p_i-r-tn}\Vert)$$ I don't know what the angle brackets mean. Can anyone help?