added moebius strip example / added XInitThreads - gsl-shell.git - gsl-shell

diff --git a/pre3d/test.lua b/pre3d/test.lua
index b1855f1e..ff291090 100644
--- a/pre3d/test.lua
+++ b/pre3d/test.lua

@@ -95,7 +95,7 @@ function demo3()

-- renderer.fill_rgba_alpha = 0.95

-- renderer.stroke_rgba = rgb(0x66/255, 0x66/255, 0x66/255)

- renderer.camera.focal_length = 30;

+ renderer.camera.focal_length = 40;

local N, tour = 256, 2*pi

for j=0, N do

@@ -104,3 +104,31 @@ function demo3()

draw(renderer, shape)

end

end

+

+function demo4()

+ local win = window('black')

+ win:setview(-1, -1, 1, 1)

+

+ local renderer = Pre3d.Renderer(win)

+ local x = |u,v| (1 + 1/2 * v *cos(u/2))*cos(u)

+ local y = |u,v| (1 + 1/2 * v *cos(u/2))*sin(u)

+ local z = |u,v| 1/2 * v * sin(u/2)

+ local shape = ShapeUtils.makeUVSurface(y, z, x, 0, -1, 2*pi, 1, 60, 4)

+

+ renderer.draw_overdraw = false

+ renderer.draw_backfaces = true

+ renderer.fill_rgba = rgb(0x4A/255, 0x92/255, 0xBF/255)

+ renderer.fill_rgba_backside = rgb(0xBF/255, 0x92/255, 0x4A/255)

+ renderer.set_light_intensity = true

+ renderer.draw_overdraw = true

+-- renderer.stroke_rgba = rgb(0x66/255, 0x66/255, 0x66/255)

+

+ renderer.camera.focal_length = 40;

+

+ local N, tour = 256, 2*pi

+ for j=0, N do

+ local a = tour*j/N

+ setTransform(renderer.camera.transform, -a, -0.15*a)

+ draw(renderer, shape)

+ end

+end