188 lines
6.5 KiB
Scheme
188 lines
6.5 KiB
Scheme
;#lang scheme
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;(require fluxus-016/drflux)
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; extrusion code
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(define (draw-profile index profile offset)
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(cond ((not (null? profile))
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(pdata-set! "p" index (vadd (car profile) offset))
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(draw-profile (+ index 1) (cdr profile) offset))))
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(define (transform-profile profile m)
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(cond
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((null? profile) '())
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(else
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(cons (vtransform (car profile) m)
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(transform-profile (cdr profile) m)))))
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; figures out the vector for rotation of the profile
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(define (path-vector first-segment path lv)
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(let* ((v (if (null? (cdr path)) ; last segment?
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lv ; use the last vector used
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(vsub (cadr path) (car path)))) ; use the next point
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(vd (if first-segment v ; first segment?
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(vadd (vmul lv 0.5) ; blend with the last vector
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(vmul v 0.5)))))
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vd))
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(define (extrude-segment index profile path width lv up size)
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(cond ((not (null? path))
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(let ((v (path-vector (zero? index) path lv)))
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(draw-profile index (transform-profile profile
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(mmul
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(maim v up)
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(mrotate (vector 0 90 0))
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(mscale (vmul (vector (car width) (car width) (car width)) size))))
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(car path))
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v))))
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(define (extrude index profile path width lv up)
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(cond ((not (null? path))
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(let ((v (extrude-segment index profile path width lv up 1)))
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(extrude (+ index (length profile)) profile (cdr path) (cdr width) v up)))))
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(define (stitch-face index count profile-size in)
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(cond
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((eq? 1 count)
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(append in (list (+ (- index profile-size) 1) index (+ index profile-size)
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(+ (- index profile-size) 1 profile-size))))
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(else
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(append
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(list (+ index 1) index
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(+ index profile-size) (+ index profile-size 1))
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(stitch-face (+ index 1) (- count 1) profile-size in)))))
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(define (stitch-indices index profile-size path-size in)
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(cond
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((eq? 1 path-size) in)
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(else
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(append
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(stitch-face index profile-size profile-size '())
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(stitch-indices (+ index profile-size)
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profile-size
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(- path-size 1)
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in)))))
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(define (build-tex-coords profile-size path-size vscale)
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(pdata-index-map!
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(lambda (i t)
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(vector (* vscale (/ (quotient i profile-size) path-size))
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(/ (modulo i profile-size) profile-size) 0))
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"t"))
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(define (build-extrusion profile path width tex-vscale up)
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(let ((p (build-polygons (* (length profile) (length path)) 'quad-list)))
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(with-primitive p
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(poly-set-index (stitch-indices 0 (length profile) (length path) '()))
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(build-tex-coords (length profile) (length path) tex-vscale)
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(extrude 0 profile path width (vector 0 0 0) up)
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(recalc-normals 0))
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p))
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; partial extrusions are for animating
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(define (build-partial-extrusion profile path tex-vscale)
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(let ((p (build-polygons (* (length profile) (length path)) 'quad-list)))
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(with-primitive p
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(poly-set-index (stitch-indices 0 (length profile) (length path) '()))
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(build-tex-coords (length profile) (length path) tex-vscale))
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p))
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(define (partial-extrude t profile path width up grow)
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(define (chop-front l n)
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(cond ((null? l) l)
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(else
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(if (zero? n) (cons (car l) (chop-front (cdr l) n))
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(chop-front (cdr l) (- n 1))))))
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(define (collapse-front)
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(let ((start (* (floor t) (length profile))))
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(for ((i (in-range (+ start (* (length profile) 1)) (pdata-size))))
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(pdata-set! "p" i (pdata-ref "p" start)))))
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(define (scale-front)
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(when (> t 1)
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(let* ((start (* (floor t) (length profile)))
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(from (list-ref path (- (inexact->exact (floor t)) 1)))
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(to (list-ref path (+ (inexact->exact (floor t)) 0))))
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(for ((i (in-range start (+ start (length profile)))))
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(pdata-set! "p" i (vmix (pdata-ref "p" i)
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(vmix to from (- t (floor t))) (- t (floor t))))))))
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(define (_ t v g)
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(cond
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((< t 1) (with-primitive p (recalc-normals 0)) v)
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(else
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(let ((start (* (floor t) (length profile))))
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(_ (- t 1)
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(extrude-segment start profile
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(chop-front path (floor t))
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(chop-front width (floor t)) v up
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(if (< g 1)
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(+ g (* (- t (floor t)) grow))
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g))
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(if (< g 1)
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(+ g grow)
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1))))))
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(_ t (vector 0 0 0) 0)
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(scale-front)
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(collapse-front)
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)
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(define (build-circle-profile n r)
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(define (_ n c l)
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(cond ((zero? c) l)
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(else
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(let ((a (* (/ c n) (* 2 3.141))))
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(_ n (- c 1)
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(cons (vmul (vector (sin a) (cos a) 0) r) l))))))
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(_ n n '()))
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(clear)
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(clear-colour 0.5)
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(define profile (build-circle-profile 12 0.5))
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(define width (build-list 100
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(lambda (n) (* n 0.01 (+ 1.5 (cos (* 0.5 n)))))))
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(define path (build-list 100
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(lambda (n) (vmul (vector (sin (* 0.2 n)) 0 (cos (* 0.2 n))) (* 0.05 n)))))
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(define p (with-state
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(wire-colour 0)
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; (colour (vector 0.5 0.3 0.2))
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(colour (vector 1 1 1))
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(specular (vector 1 1 1))
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(shinyness 20)
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(hint-wire)
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(texture (load-texture "textures/root.png"))
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(build-partial-extrusion profile path 10)))
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#;(with-state
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(wire-opacity 0.4)
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(translate (vector 0 0 0))
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(wire-colour (vector 0 0 1))
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(hint-none)
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(hint-wire)
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; (hint-normal)
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(backfacecull 1)
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(point-width 5)
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(build-extrusion profile path width 1 (vector 0 1 0)))
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(define t 0)
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(define (animate)
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(with-primitive p
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(partial-extrude
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(* (* 0.5 (+ 1 (sin (* 0.2 t)))) (length path))
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profile path width (vector 0 1 0) 0.05)
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(set! t (+ t 0.01))))
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(every-frame (animate))
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(end-framedump)
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;(start-framedump "ext-" "jpg") |