Open source signal processing for art
draggable
This class lets you use Lua to execute openGL drawings. It must be used in conjunction with "":91.contents
title
!=259/rotating cube with GLLua! h3. rk patch The test patch is very simple: an "OpenGL window":91 is directly connected to the GLLua script and sends bangs whenever it needs a redraw. There is also a "":261 object connected to the "advance" method that makes the cube rotate.lib("lib") # needed if you are running from the build directory
win = GLWindow()
cube = GLLua("cube.lua")
win => cube
m = Metro(3000)
m => advance~cube
h3. cube.lua
This is the lua script that does all the OpenGL work.
n = n or 0
x = x or 0
y = y or 0
z = z or 0
function advance()
n = n + math.pi / 1000
x = math.cos(n / 0.9) * 360 / math.pi
y = math.sin(n / 0.7) * 360 / math.pi
z = math.sin(n) * 360 / math.pi
end
inlet('advance', NilIO('just bang me'))
function draw()
gl.Clear( "COLOR_BUFFER_BIT, DEPTH_BUFFER_BIT")
gl.MatrixMode("MODELVIEW")
gl.LoadIdentity()
gl.Translate(0.0, 0.0, -6.0)
gl.Rotate(x, 1.0, 0.0, 0.0)
gl.Rotate(y, 0.0, 1.0, 0.0)
gl.Rotate(z, 0.0, 0.0, 1.0)
gl.Color(0.5,0.5,0.0,0.3)
gl.LineWidth(1.0)
glut.WireCube(2.6)
gl.Color(0.5,0.5,0.0,0.1)
glut.SolidCube(2.6)
end
function resize(width, height)
gl.Enable("BLEND")
gl.Disable("DEPTH_TEST")
gl.BlendFunc("SRC_ALPHA", "ONE_MINUS_SRC_ALPHA")
gl.Enable("LINE_SMOOTH")
-- Select the projection matrix
gl.MatrixMode("PROJECTION")
-- reset
gl.LoadIdentity()
-- Calculate the aspect ratio of the view
gl.Perspective(
45.0, -- Field of view angle
width / height, -- Aspect ration
1.0, -- zNear
100.0 -- zFar
)
view.width = width
view.height = height
end
