8b93de59c6
Endpoint-indifferent line styles (allows styles in finely chopped lines) Adjacent polygons now gapless (faces drawn w/o antialiasing; jaggies mitigated by supersampling)
55 lines
1.8 KiB
Racket
55 lines
1.8 KiB
Racket
#lang racket
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(require plot plot/utils racket/flonum)
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(time
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(plot3d (isosurface3d (λ (x y z) (sqrt (+ (sqr x) (sqr y) (sqr z)))) 1
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#:color 2 #:line-style 'transparent
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#:label "Sphere")
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#:x-min -0.8 #:x-max 0.8
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#:y-min -0.8 #:y-max 0.8
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#:z-min -0.8 #:z-max 0.8
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#:altitude 30
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#:legend-anchor 'center))
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(time
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(define saddle (λ (x y z) (- (sqr x) (* 1/2 (+ (sqr y) (sqr z))))))
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(plot3d (isosurfaces3d saddle #:d-min -1 #:d-max 1 #:label "d")
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#:x-min -2 #:x-max 2
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#:y-min -2 #:y-max 2
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#:z-min -2 #:z-max 2
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#:legend-anchor 'top-left))
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(time
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(define saddle (λ (x y z) (- (sqr x) (* 1/2 (+ (sqr y) (sqr z))))))
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(plot3d (isosurfaces3d saddle #:d-min -1 #:d-max 1
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#:colors '(1 2 3)
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#:line-colors '(1 2 3)
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#:line-styles '(solid)
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#:alphas '(3/4)
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#:label "d")
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#:x-min -2 #:x-max 2
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#:y-min -2 #:y-max 2
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#:z-min -2 #:z-max 2
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#:legend-anchor 'top-left))
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(time
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(define saddle (λ (x y z) (- (sqr x) (* 1/2 (+ (sqr y) (sqr z))))))
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(plot3d (isosurface3d saddle -1/4 #:samples 21
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#:color "black" #:style 3
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#:alpha 1
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#:label "d = -1/4")
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#:x-min -2 #:x-max 2
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#:y-min -2 #:y-max 2
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#:z-min -2 #:z-max 2))
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(define 2pi (* 2 pi))
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(time
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(define (f1 θ ρ) (+ 1 (/ θ 2pi) (* 1/8 (sin (* 8 ρ)))))
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(define (f2 θ ρ) (+ (/ θ 2pi) (* 1/8 (sin (* 8 ρ)))))
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(plot3d (list (polar3d f1 #:samples 41 #:color "navajowhite" #:line-style 'transparent #:alpha 2/3)
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(polar3d f2 #:samples 41 #:color "navajowhite" #:line-style 'transparent #:alpha 2/3))
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#:title "A Seashell" #:x-label #f #:y-label #f))
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