JOGL Lightning

Using JOGL, you can provide various light effects to any type of object through coding. This effects makes the object visually better.

Lighting Source

Following are some of the important light sources: -

Ambient Lightning - It always give a particular color to an object.
Diffuse Lightning - It scattered the light on an object from different angles.
Specular Lightning - It simulates the bright spot of light on an object

JOGL Important Methods

These are some of the important methods used to provide light to an object: -

glEnable() - Invoke this method to enable the light property for an object with the required argument as shown below :

glDisable() - This method disables the light. By default, the property is disabled.
glLightFV() - This is a method of GLLightingfunc interface and contains four light source parameters. These parameters are: -
- Light - It specifies a type of light.
- Pname - It specifies a source of light parameter.
- Param - This is used to specify the value passed in pname parameters.
- Source parameter - Pass the required light source parameter.

float[] ambientLight = {0f, 0f, 1f,0f };  
gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_AMBIENT, ambientLight, 0);  

float[] specularLight = {1f, 0f, 0f,0f };  
gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_SPECULAR, specularLight, 0);  


float[] diffuseLight = { 1f,0f,0f,0f };  
gl.glLightfv( GL2.GL_LIGHT0, GL2.GL_DIFFUSE, diffuseLight, 0 ); 

JOGL Lighting Example

In this example, we will rotate a triangle as we have done earlier. With each rotation you will notice that the color of triangle will also be changed.

package com.javatpoint.jogl;

import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas; 
import com.jogamp.opengl.util.*; 
import javax.swing.JFrame; 



public class JLight implements GLEventListener { 
private float rotation;
	
   @Override
public void display( GLAutoDrawable drawable ) {

final GL2 gl = drawable.getGL().getGL2(); 
gl.glColor3f(1f,0f,0f);
gl.glClear( GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );   
gl.glLoadIdentity();       
gl.glRotatef( rotation, 1.0f, 1.0f, 0.0f ); 
		
gl.glBegin(GL2.GL_TRIANGLES);   

gl.glVertex2d(0,0.5);

gl.glVertex2d(-0.5,-0.5);

gl.glVertex2d(0.5,-0.5);

gl.glEnd(); 
		
gl.glFlush(); 
      //Angle
rotation += 0.6f;   

gl.glEnable( GL2.GL_LIGHTING );  
gl.glEnable( GL2.GL_LIGHT0 );  
gl.glEnable( GL2.GL_DEPTH_TEST );  

float[] ambientLight = {0f, 0f, 1f,0f };  
gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_AMBIENT, ambientLight, 0);  

float[] specularLight = {1f, 0f, 0f,0f };  
gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_SPECULAR, specularLight, 0);  


float[] diffuseLight = { 1f,0f,0f,0f };  
gl.glLightfv( GL2.GL_LIGHT0, GL2.GL_DIFFUSE, diffuseLight, 0 ); 
   }  

   @Override 
public void dispose( GLAutoDrawable arg0 ) { 
      //method body  
   } 

   @Override 
public void init( GLAutoDrawable arg0 ) { 

   } 
	
   @Override 
public void reshape( GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4 ) { 

   } 
public static void main(String[] args) {
	
	final GLProfile gp = GLProfile.get(GLProfile.GL2);
	GLCapabilities cap = new GLCapabilities(gp);
	
	final GLCanvas gc = new GLCanvas(cap);
	JLight tr= new JLight();
	gc.addGLEventListener(tr);
	gc.setSize(400, 400);
	
	final JFrame frame = new JFrame("JOGL Lighting");
	frame.add(gc);
	frame.setSize(500,400);
	frame.setVisible(true);  
	
	final FPSAnimator animator = new FPSAnimator(gc, 400,true ); 
	animator.start(); 
	   }
	}

Output: