Clojure Civitas

(ns civitas.why.village.shading
  (:require [thi.ng.color.core :as col]))

(defn normalize [[x y z]]
  (let [m (Math/sqrt (+ (* x x) (* y y) (* z z)))]
    [(/ x m) (/ y m) (/ z m)]))

(defn dot [[ax ay az] [bx by bz]]
  (+ (* ax bx) (* ay by) (* az bz)))

(def light-dir (normalize [1 1 1]))

(defn shade-color [hex normal]
  (let [n (normalize normal)
        lighting (max 0.3 (dot n light-dir)) ;; never go below 30%
        c (col/hex hex)]
    (-> c
        (col/scale lighting)
        col/as-hex)))

Syntax error compiling at (16:11).

No such var: col/hex

clojure.core/eval  core.clj: 3232
              ...               
             java.lang.RuntimeException: No such var: col/hex
clojure.lang.Compiler$CompilerException: Syntax error compiling at (16:11).
    data: #:clojure.error{:phase :compile-syntax-check,
                      :line 16,
                      :column 11,
                      :source "NO_SOURCE_PATH"}

source: src/civitas/why/village/shading.clj