1. void draw() {
2.   background(50);

1. void cameraTurn() {
2.   xPos = cos(radians(rotation)) * radius;
3.   zPos = sin(radians(rotation)) * radius;
4.   yPos = 0;
5.   if (keyPressed) {
6.     if (key == ENTER  || key == RETURN ) {
7.       rotation++;
8.       redraw();
9.     }
10.   }
11. }

1. //
2. // ===========================================
3. public class Huisje {
4.   void draw() {
5.     translate(300, 0, 100);
6.     noStroke();
7.     fill(100);
8.     box(50, 20, 10);
9.   } // method
10. } // class
11. // ========================================================
12. //
13. Huisje huis = new Huisje();
14. // Camera variables
15. float xPos = 100;
16. float yPos = -50;
17. float zPos = 100;
18. float rotation = 0; 
19. float radius = 50; 
20. // Zoom variables
21. float zoom = 0;
22. int s1;
23. int s2;
24. // -------------------------------------------------------
25. // main funcs
26. void setup() {
27.   size(400, 400, P3D);
28.   background(50);
29.   lights();
30. }
31. //
32. void draw() {
33.   background(50);
34.   cameraTurn();
35.   camera(  300 + xPos + zoom,
36.   yPos + zoom,
37.   100 + zPos + zoom,
38.   300.0, 0, 100.0,
39.   0.0, 1.0, 0.0);
40.   huis.draw();
41.   tekst();
42. }
43. // -------------------------------------------------------
44. // other funcs
45. void tekst() {
46.   camera();
47.   fill(100 + s1);
48.   textSize(20);
49.   text("-", 130, 20);
50.   fill(100 + s2);
51.   textSize(20);
52.   text("+", 110, 20);
53. }
54. //
55. void cameraTurn() {
56.   xPos = cos(radians(rotation)) * radius;
57.   zPos = sin(radians(rotation)) * radius;
58.   yPos = 0;
59. }
60. // ---------------------------------------------------------
61. // Inputs
62. void mousePressed() {
63.   if ( (mouseX<140) && (130<mouseX) && (10<mouseY) && (mouseY<30)) {
64.     zoom--;
65.     s1 = 155;
66.     //redraw();
67.   }
68.   else if ((mouseX< 120) && (110< mouseX) && (10<mouseY) && (mouseY<30)) {
69.     zoom++;
70.     s2 = 155;
71.     // redraw();
72.   }
73.   else {
74.     s1 = 0;
75.     s2 = 0;
76.   }
77. }
78. //
79. void keyPressed() {
80.   if (key == ENTER || key == RETURN) {
81.     rotation++;
82.     // redraw();
83.   }
84. }
85. //

turns now, but it seems it doesn't show it right.

1. void draw() {
2.   background(50);
3.   lights();

1. //
2. // ===========================================
3. public class Huisje {
4.   void draw() {
5.     translate(300, 0, 100);
6.     noStroke();
7.     fill(100);
8.     box(50, 20, 10);
9.   } // method
10. } // class
11. // ========================================================
12. //
13. Huisje huis = new Huisje();
14. // Camera variables
15. float xPos = 100;
16. float yPos = -50;
17. float zPos = 100;
18. float rotation = 0; 
19. float radius = 80; 
20. // Zoom variables
21. // float zoom = 0;
22. int s1;
23. int s2;
24. // -------------------------------------------------------
25. // main funcs
26. void setup() {
27.   size(400, 400, P3D);
28.   background(50);
29.   lights();
30. }
31. //
32. void draw() {
33.   background(50);
34.   lights();
35.   cameraTurn();
36.   camera(  300 + xPos,
37.   yPos,
38.   100 + zPos,
39.   300.0, 0, 100.0,
40.   0.0, 1.0, 0.0);
41.   huis.draw();
42.   tekst();
43. }
44. // -------------------------------------------------------
45. // other funcs
46. void tekst() {
47.   camera();
48.   fill(100 + s1);
49.   textSize(20);
50.   text("-", 130, 20);
51.   fill(100 + s2);
52.   textSize(20);
53.   text("+", 110, 20);
54. }
55. //
56. void cameraTurn() {
57.   xPos = cos(radians(rotation)) * radius;
58.   zPos = sin(radians(rotation)) * radius;
59.   yPos = 0;
60. }
61. // ---------------------------------------------------------
62. // Inputs
63. void mousePressed() {
64.   if ( (mouseX<140) && (130<mouseX) && (10<mouseY) && (mouseY<30)) {
65.     radius--;
66.     s1 = 155;
67.     //redraw();
68.   }
69.   else if ((mouseX< 120) && (110< mouseX) && (10<mouseY) && (mouseY<30)) {
70.     radius++;
71.     s2 = 155;
72.     // redraw();
73.   }
74.   else {
75.     s1 = 0;
76.     s2 = 0;
77.   }
78. }
79. //
80. void keyPressed() {
81.   if (key == ENTER || key == RETURN) {
82.     rotation++;
83.     // redraw();
84.   }
85. }
86. //