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(in-package #:cl-user) (defun lc-v- (a b) (map 'vector #'- a b)) ; 3-vector subtract a-b (defun lc-cross (a b) ; 3-vector cross product (macrolet ((woo (p q) `(- (* (elt a ,p) (elt b ,q )) (* (elt a ,q) (elt b ,p))))) (vector (woo 1 2) (woo 2 0) (woo 0 1)))) (defun apply-to-hemicube-faces (n fn) (let ((size (/ n))) (dotimes (d 3) (dotimes (i n) (dotimes (j n) (let ((base-x (* i size)) (base-y (* j size))) (funcall fn d i j (vector base-x base-y 0) (vector base-x base-y 0) (vector base-x base-y 0) (vector base-x base-y 0)))))))) (defun lc-point-transformer () (lambda (point) (let ((z (+ 2.0 (elt point 2))) (zoom 2.0)) (vector (* zoom (/ (elt point 0) z)) (* zoom (/ (elt point 1) z)) z)))) (defun apply-to-transformed-faces (pane continuation) (let ((transformer (lc-point-transformer))) (apply-to-hemicube-faces 5 (lambda (side i j &rest points) (format *Debug-io* "xxx ~s~%" points) (format *Debug-io* "yyy ~s~%" (mapcar transformer points)) (apply continuation side i j (mapcar transformer points)))))) (defun lc-face-normal (points) (lc-cross (lc-v- (elt points 2) (elt points 1)) (lc-v- (elt points 0) (elt points 1)))) (defun backface-p (points) (<= (elt (lc-face-normal points) 2) 0)) (defun draw-logic-cube (pane) (apply-to-transformed-faces pane (lambda (side i j &rest camera-points) (format *Debug-io* "camera points ~s~%" camera-points) (unless (backface-p camera-points) (setf camera-points (qlc-scale-polygon camera-points (squeeze pane)))))))