Light Rays 0.0 - most basic code: only a quad

testApp.cpp

#include "testApp.h"

void testApp::setup(){
	ofBackground(33);
	ofSetVerticalSync(true);
	take_screenshot = false ;
	
	// create quad width size "s", centered
	float s = 1;
	float hs = s * 0.5;
	plane_data.addVertex(-hs,-hs,0);
	plane_data.addVertex(hs,-hs,0);
	plane_data.addVertex(hs,hs,0);
	plane_data.addVertex(-hs,hs,0);
	
	view.translate(0,0,-4);
}

void testApp::draw(){
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0f, 625.0f/469.0f, 0.1,100); // 625/469 is my window size
	
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glMultMatrixf(view.getPtr());
	
	// uses glBegin/glVertex3f/glEnd
	plane_data.debugDraw(GL_QUADS);
	
	if(take_screenshot) {
		ofSaveScreen("light_rays_"+ofToString(ofGetHours()) +"_" +ofToString(ofGetMinutes()) +"_" +ofToString(ofGetSeconds()) +".png");
		take_screenshot = false;
	}
}

void testApp::keyPressed(int key){
	if(key == ' ') {
		take_screenshot = !take_screenshot;
	}
}

testApp.h

#pragma once

#include "ofMain.h"
#include "Roxlu.h"
using namespace roxlu;

class testApp : public ofBaseApp{

	public:
		void setup();
		void update();
		void draw();
		void keyPressed  (int key);
		
		bool take_screenshot;
		Mat4 view;	
		VertexData plane_data;
		VBO plane_vbo;
		VAO plane_vao;

		// not used in example
		void keyReleased(int key);
		void mouseMoved(int x, int y );
		void mouseDragged(int x, int y, int button);
		void mousePressed(int x, int y, int button);
		void mouseReleased(int x, int y, int button);
		void windowResized(int w, int h);
		void dragEvent(ofDragInfo dragInfo);
		void gotMessage(ofMessage msg);
};

result