Learning Processing: A Beginner's Guide to Programming Images ...

236 Learning Processing
(�10,�10,�10)
(�10,10,�10)
vertex(–10,–10,–10); vertex(10,–10,–10); vertex( 10,10,–10); vertex( –10, 10,–10);
vertex( 10,–10,–10); vertex(10, 10,–10); vertex(–10,10,–10); vertex(–10,–10,–10);
vertex( 0, 0, 10); vertex( 0, 0, 10); vertex( 0, 0, 10); vertex( 0, 0, 10);
fi g. 14.11
Example 14-4: Pyramid using beginShape(TRIANGLES)
void setup() {
size(200,200,P3D);
}
void draw() {
background(255);
translate(100,100,0);
drawPyramid(150);
}
void drawPyramid(int t) {
stroke(0);
// this pyramid has 4 sides, each drawn as a separate triangle
// each side has 3 vertices, making up a triangle shape
// the parameter " t " determines the size of the pyramid
beginShape(TRIANGLES);
fill(255,150);
vertex(–t,–t,–t);
vertex( t,-t,–t);
vertex( 0, 0, t);
fill(150,150);
vertex( t,–t,–t);
vertex( t, t,–t);
vertex( 0, 0, t);
fill(255,150);
vertex( t, t,–t);
vertex(–t, t,–t);
vertex( 0, 0, t);
y
x
BASE
at
z = �10
(10,�10,�10)
(10,10,�10)
Connected to
APEX
at
z = 10
(0,0,10)
Since the pyramid’s vertices are drawn relative to
a centerpoint, we must call translate() to place the
pyramid properly in the window.
The function sets the vertices for the pyramid around
the centerpoint at a fl exible distance, depending on the
number passed in as an argument.
Note that each polygon
can have its own color.
fi g. 14.12