In setup() I load the image data into the img global object, but I don't know to apply the image on the texture. This function wasn't created by me.

1. void drawFunction(){
2.   float x, y, z;
3.   int i = 0, j = 0;
4.   float in_steps = 1.0 / steps;
5.   float[][] matrix = new float[steps+1][steps+1];
6.   beginShape();
7.   texture(img);
8.   for (y = 0.0, j = 0; y <= 1.0; y+=in_steps, j++)
9.     for (x = 0.0, i = 0; x <= 1.0; x+=in_steps, i++)
10.       matrix[i][j] = function(x, y);
11.     for (j = 0, y = 0.0; j < steps; j++, y+=in_steps) {
12.       beginShape(QUAD_STRIP);
13.         for (i = 0, x = 0.0; i <= steps; i++, x+=in_steps) {
14.           vertex(x, y, matrix[i][j]);
15.           vertex(x, y + in_steps, matrix[i][j+1]);
16.         }
17.       endShape();
18.     }
19.   endShape();
20. }

I'm trying to draw a cone with a base, but I don't know why the base does not appear.

1. void setup(){
2.   size(500, 500, P3D);
3.   background(255);
4.   frameRate(60);
5. }
6. void draw(){
7.   background(255);
8.   translate(width/2, height/2);
9.   rotateShape( mouseY * 0.01, mouseX * 0.01, mouseX * 0.01 );
10.   cone(10, 200, 50.0);
11. }
12. void cone(int det, int h, float r){
13.  
14.   float[] unitConeX = new float[det+1];
15.   float[] unitConeY = new float[det+1];
16.   for (int i = 0; i <= det; i++) {
17.     float a1 = TWO_PI * i / det;
18.     unitConeX[i] = (float)Math.cos(a1);
19.     unitConeY[i] = (float)Math.sin(a1);
20.   }
21.  
22.   pushMatrix();
23.   scale(r, r);
24.  
25.   beginShape(TRIANGLES);
26.   for(int i = 0; i < det; i++){
27.     vertex(unitConeX[i], unitConeY[i], 0.0);
28.     vertex(unitConeX[i + 1], unitConeY[i+1], 0.0);
29.     vertex(0,0,h);
30.   }
31.  
32.   endShape();
33.  
34.   beginShape(TRIANGLE_FAN);
35.   vertex(0, h/2, 0);
36.   for(int i = 0; i < det; i++){
37.     vertex(unitConeY[i] * r, h/2, unitConeX[i] * r);
38.   }
39.   endShape();
40.   popMatrix();
41. }
42. void rotateShape(float x, float y, float z){
43.   rotateX(x);
44.   rotateY(y);
45.   rotateZ(z);
46. }

I'm new to processing (in Java not) and I don't understand how to calculate sin. I saw different examples for how to draw a polygon with line (not vertex), but I don't understand it. This example below is made by me with lines no calculations (sin, cos), I only added the line parameters. So... how to calculate sin? According to what? According to oX, oY? How am I supposed to draw ONLY the red line?

1. private static final Integer SIZE = 100; // constant
2. translate(width/2, height/2); //center
3. stroke(255,0,0); // red color
4. line( sin( ??? ) + SIZE, cos( ???? ) + SIZE.... // I don't get it