i would like to exchange the wireframe in this code to a drawing i made with black lines on white surface. I want the white areas to be transparent and only the black ones should appear. Is this possible? How can i do this. I am beginner.

THANK YOU

import toxi.processing.*;

import toxi.math.conversion.*;
import toxi.geom.*;
import toxi.math.*;
import toxi.geom.mesh2d.*;
import toxi.util.datatypes.*;
import toxi.util.events.*;
import toxi.geom.mesh.subdiv.*;
import toxi.geom.mesh.*;
import toxi.math.waves.*;
import toxi.util.*;
import toxi.math.noise.*;

import toxi.geom.*;
import toxi.geom.mesh.*;
import toxi.math.noise.*;

import toxi.processing.*;

float NS = 0.05f;
float SIZE = 100;
float AMP = SIZE*4;

Mesh3D mesh;
ToxiclibsSupport gfx;

boolean isWireframe=true;

void setup() {
  size(680, 382, P3D);
  gfx = new ToxiclibsSupport(this);
}

void draw() {
  updateMesh();
  background(0);
  translate(width / 2, height / 2, 0);
  float rx = mouseY * 0.01f;
  float ry = mouseX * 0.01f;
  rotateX(rx);
  rotateY(ry);
  gfx.origin(100);
  if (isWireframe) {
    noFill();
    stroke(255);
  }
  else {
    fill(255);
    noStroke();
    lights();
  }
  gfx.mesh(mesh,!isWireframe);
}

void updateMesh() {
  float phase=frameCount*NS*0.01;
  BezierPatch patch = new BezierPatch();
  for (int y = 0; y < 4; y++) {
    for (int x = 0; x < 4; x++) {
      float xx = x * SIZE;
      float yy = y * SIZE;
      float zz = (float) (SimplexNoise.noise(xx * NS, yy * NS,phase) * AMP);
      patch.set(x, y, new Vec3D(xx, yy, zz));
    }
  }
  mesh=patch.toMesh(!mousePressed ? 32 : 4);
  mesh.center(null);
}

void keyPressed() {
  if (key == 'w') {
    isWireframe = !isWireframe;
  }
}