processing proce55ing opengl 円柱

proce55ingでOPENGLを使おうとすると、基本図形が球と直方体しかないみたい。そこで、円柱を作った人がいる。以下は、そのまま動くコード。

import processing.opengl.*;

float rad = 0;

void setup(){
size(200, 200, OPENGL);
}

void draw(){
rad = rad + 1;
noStroke();
directionalLight(255,255,255,0,1,-1);
background(0);

translate(100, 100,0);
rotateX(radians(rad * 2));
rotateZ(radians(rad));
pillar(150, 10 , 50);
}

//円柱の作成
// length 長さ
// radius 上面の半径
// radius 底面の半径
void pillar(float length, float radius1 , float radius2){
float x,y,z; //座標
pushMatrix();

//上面の作成
beginShape(TRIANGLE_FAN);
y = -length / 2;
vertex(0, y, 0);
for(int deg = 0; deg <= 360; deg = deg + 10){
x = cos(radians(deg)) * radius1;
z = sin(radians(deg)) * radius1;
vertex(x, y, z);
}
endShape();

//底面の作成
beginShape(TRIANGLE_FAN);
y = length / 2;
vertex(0, y, 0);
for(int deg = 0; deg <= 360; deg = deg + 10){
x = cos(radians(deg)) * radius2;
z = sin(radians(deg)) * radius2;
vertex(x, y, z);
}
endShape();

//側面の作成
beginShape(TRIANGLE_STRIP);
for(int deg =0; deg <= 360; deg = deg + 5){
x = cos(radians(deg)) * radius1;
y = -length / 2;
z = sin(radians(deg)) * radius1;
vertex(x, y, z);

x = cos(radians(deg)) * radius2;
y = length / 2;
z = sin(radians(deg)) * radius2;
vertex(x, y, z);

}
endShape();

popMatrix();
}