jit.gl.lua で光源・マテリアルを設定して描画：Cycling’74 Max,OpenGL,Jitter

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this.autowatch = 1
this.gc = 1

local gl = require("opengl")
local glu = require("opengl.glu")
local GL = gl
local GLU = glu;
local _analogIn = {};

local vertexes = {
{-0.5,0.5,0.5},
{-0.5,-0.5,0.5},
{0.5,-0.5,0.5},
{0.5,0.5,0.5},
{-0.5,0.5,-0.5},
{-0.5,-0.5,-0.5},
{0.5,-0.5,-0.5},
{0.5,0.5,-0.5}
};

local lightAmb = {0,0,0,1}
local lightDiff = {1,1,1,1}
local lightSpec = {1,1,1,1}
local lightPos = {1,1,1,0}

local goldAmb = {0.24725,0.1995,0.0745,1}
local goldDiff = {0.75164,0.60648,0.22648,1};
local goldSpec = {0.628281,0.555802,0.366065,1};
local goldShin = 51.2;

local _rot = {0,0,0};
local angle = 0;

function rot(…)

_rot = {…};
end

function drawCube()

–top
gl.Normal(0,1,0);
gl.Begin(GL.QUADS);
gl.Vertex(vertexes[1])
gl.Vertex(vertexes[4])
gl.Vertex(vertexes[8])
gl.Vertex(vertexes[5])
gl.End();

–buttom
gl.Normal(0,-1,0)
gl.Begin(GL.QUADS)
gl.Vertex(vertexes[6])
gl.Vertex(vertexes[7]);
gl.Vertex(vertexes[3]);
gl.Vertex(vertexes[2]);
gl.End()

–front
gl.Normal(0,0,1)
gl.Begin(GL.QUADS)
gl.Vertex(vertexes[1])
gl.Vertex(vertexes[2])
gl.Vertex(vertexes[3])
gl.Vertex(vertexes[4])
gl.End()

–back
gl.Normal(0,0,-1)
gl.Begin(GL.QUADS)
gl.Vertex(vertexes[5])
gl.Vertex(vertexes[8])
gl.Vertex(vertexes[7])
gl.Vertex(vertexes[6])
gl.End()

–left
gl.Normal(-1,0,0)
gl.Begin(GL.QUADS)
gl.Vertex(vertexes[1])
gl.Vertex(vertexes[5])
gl.Vertex(vertexes[6])
gl.Vertex(vertexes[2])
gl.End()

–right
gl.Normal(1,0,0)
gl.Begin(GL.QUADS)
gl.Vertex(vertexes[4])
gl.Vertex(vertexes[3])
gl.Vertex(vertexes[7])
gl.Vertex(vertexes[8])
gl.End()

end

function scriptload()

print("scriptload");

end

function draw()

–init
gl.ClearColor(1,1,1,1)
gl.ClearDepth(1)
gl.Enable(GL.DEPTH_TEST)

gl.Light(GL.LIGHT0,GL.AMBIENT,lightAmb)
gl.Light(GL.LIGHT0,GL.DIFFUSE,lightDiff)
gl.Light(GL.LIGHT0,GL.SPECULAR,lightSpec)

gl.Enable(GL.LIGHT0)
gl.Enable(GL.LIGHTING)
gl.Enable(GL.NORMALIZE)

gl.Clear(GL.COLOR_BUFFER_BIT,GL.DEPTH_BUFFER_BIT)
gl.LoadIdentity();
glu.LookAt({0,0,2},{0,0,0},{0,1,0});

–light
gl.Light(GL.LIGHT0,GL.POSITION,lightPos)

gl.PushMatrix()
gl.Rotate(_rot)

— gl.Rotate(angle,0,1,0)
gl.Material(GL.FRONT_AND_BACK,GL.AMBIENT,goldAmb);
gl.Material(GL.FRONT_AND_BACK,GL.DIFFUSE,goldDiff);
gl.Material(GL.FRONT_AND_BACK,GL.SPECULAR,goldSpec)
gl.Material(GL.FRONT_AND_BACK,GL.SHININESS,goldShin);

drawCube();

gl.PopMatrix()

angle = angle + 1;
if angle >= 360 then angle = 0 end

end
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参考図書

はじめてのOpenGL―ライブラリを使った「3D‐CGプログラミング」の基本  – p.131 からのサンプルを利用しました。MaxのOpenGLとバージョンがあっているため、この書籍は勉強しやすいです。