Hi, Im really new to Processing and have a few problems I cant seem to solve by myself. Im messing about with the brightness threshold example so I can kinda draw using different light sources.

As you can see though I've added in code I found in another post to try and flip the video horizontally but it doesnt seem to work. I get an error saying:

"texture() is not available with this renderer.
vertex(x, y, u, v) is not available with this renderer."

In the example all pixels below a certain threshold turn black and pixels above it turn white but i was wondering if theres a way for the black pixels to be fully see through or simply turned off so Im actually seeing a standard webcam feed with the white brighter pixels overlayed on top of it. I figure its simply a matter of telling the code not to turn the dark pixels black but I cant seem to do it.

Any help would be greatly appreciated as Im trying to get this working for a college assignment but am pretty stuck at the moment.

Thanks in advance for your help.

import processing.video.*;

color black = color(0,1);
color white = color(255);
int numPixels;
Capture video;

void setup() {
 size(640, 480); // Change size to 320 x 240 if too slow at 640 x 480
 strokeWeight(5);
 // Uses the default video input, see the reference if this causes an error
 video = new Capture(this, width, height, 24);
 numPixels = video.width * video.height;
 noCursor();
 smooth();
}

void draw() {
 if (video.available()) {
   video.read();
   video.loadPixels();
   int threshold = 180; // Set the threshold value
   float pixelBrightness; // Declare variable to store a pixel's color
   // Turn each pixel in the video frame black or white depending on its brightness
   loadPixels();
   for (int i = 0; i < numPixels; i++) {
     pixelBrightness = brightness(video.pixels[i]);
     if (pixelBrightness > threshold) { // If the pixel is brighter than the
       pixels[i] = white; // threshold value, make it white
     }
     else { // Otherwise,
       pixels[i] = black; // make it black
     }
   }
   
   beginShape();
texture(video);
vertex(0,0,0,video.height);
vertex(width,0,video.width,video.height);
vertex(width,height,video.width,0);
vertex(0,height,0,0);
endShape();

   updatePixels();
   // Test a location to see where it is contained. Fetch the pixel at the test
   // location (the cursor), and compute its brightness
   int testValue = get(mouseX, mouseY);
   float testBrightness = brightness(testValue);
   if (testBrightness > threshold) { // If the test location is brighter than
     fill(black); // the threshold set the fill to black
   }
   else { // Otherwise,
     fill(white); // set the fill to white
   }
 }
}

Thanks for your help, I'll give that a try. Does anybody have ideas on how I can show the regular webcam feed instead of black pixels. If I can get that working it would be great. Cheers!