Exception in thread "Animation Thread" java.lang.NoSuchFieldError: canvas
	at gestalt.p5.GestaltPlugIn.create(GestaltPlugIn.java:199)
	at gestalt.p5.GestaltPlugIn.<init>(GestaltPlugIn.java:131)
	at gestalt.p5.GestaltPlugIn.<init>(GestaltPlugIn.java:96)
	at gestalt.demo.processing.UsingOpenGL.setup(UsingOpenGL.java:57)
	at processing.core.PApplet.handleDraw(PApplet.java:1403)
	at processing.core.PApplet.run(PApplet.java:1328)
	at java.lang.Thread.run(Unknown Source)
 

package gestalt.demo.processing;


import javax.media.opengl.GL;
import javax.media.opengl.glu.GLU;

import gestalt.context.GLContext;
import gestalt.p5.GestaltPlugIn;
import gestalt.render.bin.RenderBin;
import gestalt.shape.AbstractDrawable;

import processing.core.PApplet;



public class UsingOpenGL
    extends PApplet {

    private GestaltPlugIn gestalt;

    public void setup() {
	  /* setup p5 */
	  size(640, 480, OPENGL);

	  /* create gestalt plugin */
	  gestalt = new GestaltPlugIn(this);

	  /* remove all gestalt presets */
	  RenderBin myRenderBin = new RenderBin();
	  gestalt.setBinRef(myRenderBin);
	  myRenderBin.add(new RawOpenGL());
    }


    public void draw() {
	  background(0);
    }


    private class RawOpenGL
	  extends AbstractDrawable {

	  public void draw(final GLContext theContext) {
		GL gl = gestalt.getGL();
		GLU glu = gestalt.getGLU();

		gl.glViewport(0, 0, width, height);
		gl.glMatrixMode(GL.GL_PROJECTION);
		gl.glLoadIdentity();
		glu.gluPerspective(45.0f,
					 (float) width / (float) height,
					 1.0,
					 20.0);

		gl.glMatrixMode(GL.GL_MODELVIEW);
		gl.glLoadIdentity();

		gl.glTranslatef( -1.5f, 0.0f, -6.0f);
		gl.glBegin(GL.GL_TRIANGLES);
		gl.glColor3f(1.0f, 0.0f, 0.0f);
		gl.glVertex3f(0.0f, 1.0f, 0.0f);
		gl.glColor3f(0.0f, 1.0f, 0.0f);
		gl.glVertex3f( -1.0f, -1.0f, 0.0f);
		gl.glColor3f(0.0f, 0.0f, 1.0f);
		gl.glVertex3f(1.0f, -1.0f, 0.0f);
		gl.glEnd();

		gl.glTranslatef(3.0f, 0.0f, 0.0f);
		gl.glBegin(GL.GL_QUADS);
		gl.glColor3f(0.5f, 0.5f, 1.0f);
		gl.glVertex3f( -1.0f, 1.0f, 0.0f);
		gl.glVertex3f(1.0f, 1.0f, 0.0f);
		gl.glVertex3f(1.0f, -1.0f, 0.0f);
		gl.glVertex3f( -1.0f, -1.0f, 0.0f);
		gl.glEnd();
	  }
    }


    public static void main(String[] args) {
	  PApplet.main(new String[] {UsingOpenGL.class.getName()});
    }
}