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add transform function and now define ship based on flast 3pyramid rotated and transformed

This commit is contained in:
Dan Ballard 2012-06-17 21:30:22 -07:00
parent e3fcf269cb
commit 086ef7f600
2 changed files with 12 additions and 2 deletions
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8
math.lisp
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@ -59,9 +59,17 @@
(defun scale-vector (v a)
(make-array (length v) :initial-contents (loop for i across v collecting (* i a))))
; scale points by a
(defun scale-points (points a)
(make-array (length points) :initial-contents (loop for v across points collecting (scale-vector v a))))
; scale poitns by v (x y z)
(defun transform-points (points x y z)
(make-array (length points) :initial-contents
(loop for v across points collecting
(make-array 3 :initial-contents
(list (* (aref v 0) x) (* (aref v 1) y) (* (aref v 2) z))))))
; returns a vector with all elemts scaled to biggest 1 which is scaled to 1
; e.x. (scale-vector (8 4 2)) -> (1 .5 .25)
(defun scale-vector-1 (v)

6
model.lisp
View File

@ -107,8 +107,10 @@
(defparameter *ship-model*
(make-model-3pyramid ;*3pyramid-flat-points*
(rotate-triangle (make-2d-array 4 3 *3pyramid-flat-points*) (make-rotation-matrix 0 0 0))
:face-colors '((196 196 196) (196 196 196) (196 196 196) (32 32 32))))
(transform-points
(rotate-triangle (make-2d-array 4 3 *3pyramid-flat-points*) (make-rotation-matrix 0 0 0))
4 1 3)
:face-colors '((196 196 196) (196 196 196) (196 196 196) (32 32 32))))
;(defparameter *ship-model*
; (make-model-3pyramid '((0.0 -0.5 -1.5) (0.0 0.5 1.5) (-2.0 -0.5 1.5) (2.0 -0.5 1.5))