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ripple.lisp
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ripple.lisp
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;;;; by Nikodemus Siivola <nikodemus@random-state.net>, 2009.
;;;;
;;;; Permission is hereby granted, free of charge, to any person
;;;; obtaining a copy of this software and associated documentation files
;;;; (the "Software"), to deal in the Software without restriction,
;;;; including without limitation the rights to use, copy, modify, merge,
;;;; publish, distribute, sublicense, and/or sell copies of the Software,
;;;; and to permit persons to whom the Software is furnished to do so,
;;;; subject to the following conditions:
;;;;
;;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
;;;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
;;;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
;;;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
;;;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
(in-package :raylisp)
(defclass ripple-normal (normal)
((origin
:initform +origin+
:initarg :origin
:reader origin-of)))
(defmethod compute-perturbation-function ((normal ripple-normal) transform)
(let* ((inverse (inverse-matrix transform))
(height (normal-height normal))
(origin (origin-of normal)))
(declare (single-float height)
(vec origin))
(perturbation-lambda ripple-normal (result normal point)
(declare (optimize speed))
(let* ((p2 (transform-point point inverse))
(tmp (alloc-vec)))
(declare (dynamic-extent p2))
(%noise-vec tmp p2)
(%adjust-vec result normal tmp
(* height (+ (noise p2)
(+ (sin (aref p2 2))
(sin (+ (aref p2 1) (aref p2 0))))
0.0 1.0)))
(%normalize result result)))))