What you want is the geomerative library by Ricard Marxer.

This is sketch I took from open processing, and hacked to get it to work:-

```
import geomerative.*;
RFont f;
RShape grp;
RExtrudedMesh em;
void setup() {
size(600, 400, P3D);
// VERY IMPORTANT: Allways initialize the library in the setup
RG.init(this);
// Load the font file we want to use (the file must be in the data folder in the sketch floder), with the size 60 and the alignment CENTER
grp = RG.getText("Depth!", "FreeSans.ttf", 50, CENTER);
// Set the polygonizer detail (lower = more details)
RG.setPolygonizer(RG.UNIFORMLENGTH);
RG.setPolygonizerLength(1);
// Geomerative's flat mesh
//RMesh m = grp.toMesh();
// Create an extruded mesh
em = new RExtrudedMesh(grp, 20);
// Enable smoothing
smooth();
}
void draw()
{
background(100);
lights();
translate(width/2, height/2, 200);
rotateY(millis()/2000.0);
fill(255, 100, 0);
noStroke();
// Draw mesh
em.draw();
}
class RExtrudedMesh
{
float depth = 10;
RPoint[][] points;
RMesh m;
RExtrudedMesh(RShape grp, float d)
{
depth = d;
m = grp.toMesh();
points = grp.getPointsInPaths();
}
void draw()
{
// Draw front
for (int i=0; i<m.countStrips(); i++) {
beginShape(TRIANGLE_STRIP);
for (int j=0;j<m.strips[i].vertices.length;j++) {
vertex(m.strips[i].vertices[j].x, m.strips[i].vertices[j].y, 0);
}
endShape(CLOSE);
}
// Draw back
for (int i=0; i<m.countStrips(); i++) {
beginShape(TRIANGLE_STRIP);
for (int j=0;j<m.strips[i].vertices.length;j++) {
vertex(m.strips[i].vertices[j].x, m.strips[i].vertices[j].y, -depth);
}
endShape(CLOSE);
}
// Draw side (from outline points)
for (int i=0; i<points.length; i++) {
beginShape(TRIANGLE_STRIP);
for (int j=0; j<points[i].length-1; j++)
{
vertex(points[i][j].x, points[i][j].y, 0);
vertex(points[i][j].x, points[i][j].y, -depth);
vertex(points[i][j+1].x, points[i][j+1].y, -depth);
vertex(points[i][j].x, points[i][j].y, 0);
vertex(points[i][j+1].x, points[i][j+1].y, 0);
}
vertex(points[i][0].x, points[i][0].y, 0);
endShape(CLOSE);
}
}
}
```

You need to supply “FreeSans.ttf” in the data folder for your sketch!