However, the line  "java.lang.ClassCastException: processing.core.PGraphicsAndroid2D cannot be cast to processing.core.PGraphicsAndroid3D" in the log makes me think that you are mixing A2D with A3D. Note that if your renderer is A3D, then the offscreen surface has to be set also as A3D:

1. void setup() {
2. size(480, 800, A3D);
3. ...
4. pg = createGraphics(32, 512, A3D);

I call the get in a Runnable because I was having issues with using get in my library due to timing issues between drawing and getting the pixels. Not sure if this is a bad idea, but I am using it in the test app so I can get it working in a similar fashion to my library

package com.processing.buffertest;

import java.util.Stack;

import processing.core.PApplet;

import processing.core.PFont;

import processing.core.PGraphicsAndroid3D;

import processing.core.PImage;

import android.util.Log;

import android.view.MotionEvent;

public class OffscreenBufferTestActivity extends PApplet {

String TAG = "TestApplet";

int pointerCount = 0;

PFont font;

PGraphicsAndroid3D buff;

Stack<Runnable> runners = new Stack<Runnable>();

final PApplet p = this;

int bg = 0;

PImage tempImage;

public void setup() {

buff = (PGraphicsAndroid3D) createGraphics(screenWidth, screenHeight, P3D);

}

public String sketchRenderer() {

return P3D;

}

public void draw() {

buff.beginDraw();

buff.background(0);

buff.fill(255, 0, 0);

buff.rect(0, 0, screenWidth / 2, screenHeight / 2);

buff.endDraw();

background(255);

fill(0, 0, 255);

// rect(0, 0, screenWidth / 2, screenHeight / 2);

if (!runners.empty()) {

runners.pop().run();

}

}

static public void main(String args[]) {

PApplet.main(new String[] { "Test" });

}

public boolean surfaceTouchEvent(MotionEvent event) {

if (event.getAction() == MotionEvent.ACTION_DOWN) {

final int mx = (int) event.getX();

final int my = (int) event.getY();

runners.push(new Runnable() {

@Override

public void run() {

// buff.loadPixels();

// int id = buff.pixels[my*screenWidth+mx];

int pixelColor = get(mx, my);

Log.d("Primary", "Primary get() = " + p.get(mx, my));

Log.d("Buffer", "Buffer get() = " + pixelColor + " motionX = " + mx + " motionY = " + my);

}

});

} else if (event.getAction() == MotionEvent.ACTION_UP) {

}

return super.surfaceTouchEvent(event);

}

}

thanks for any help

cheers

get (x,y) doesn't work for me either.... instead, I've been having success using copy and copyImage as a workaround.  It's pretty quick.

-nima

int color = get(x, y);

float redValue = Color.red(color);

float greenValue = Color.green(color);

float blueValue = Color.blue(color);

are you sure you are using the most current build too? That might be the issue