JOGL 3D Triangle

by Online Tutorials Library July 14, 2022

JOGL 3D Triangle

In this section, we will learn how to create a three-dimensional triangle with the help of simple example. We will also rotate this triangle to see all its sides.

J3DTriangle.java

  package com.tutoraspire.jogl;    import javax.media.opengl.*;  import javax.media.opengl.awt.GLCanvas;  import javax.media.opengl.glu.GLU;    import javax.swing.JFrame;    import com.jogamp.opengl.util.FPSAnimator;    public class J3DTriangle implements GLEventListener {    private GLU glu = new GLU();  private float rotation = 0.0f;       @Override  public void display(GLAutoDrawable drawable) {  final GL2 gl = drawable.getGL().getGL2();      gl.glClear( GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );  gl.glLoadIdentity();         // Move triangle  gl.glTranslatef( -0.5f, 0.0f, -6.0f );   gl.glRotatef( rotation, 0.0f, 1.0f, 0.0f );  gl.glBegin( GL2.GL_TRIANGLES );             // Front  gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow  gl.glVertex3f( 1.5f, 2f, 0.0f ); // Top Of Triangle     gl.glColor3f( 0.0f, 1.5f, 0.0f ); // Green  gl.glVertex3f( -1.5f, -1.5f, 1.5f ); // Left Of Triangle     gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple  gl.glVertex3f( 1.5f, -1.5f, 1.5f ); // Right Of Triangle           // Right  gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow  gl.glVertex3f( 1.5f, 2.0f, 0.0f ); // Top Of Triangle     gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple  gl.glVertex3f( 1.5f, -1.5f, 1.5f ); // Left Of Triangle     gl.glColor3f( 0.0f, 1.0f, 0.0f ); // Green  gl.glVertex3f( 1.5f, -1.5f, -1.5f ); // Right Of Triangle           // Back  gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow  gl.glVertex3f( 1.5f, 2.0f, 0.0f ); // Top Of Triangle     gl.glColor3f( 0.0f, 1.0f, 0.0f ); // Green  gl.glVertex3f( 1.5f, -1.5f, -1.5f ); // Left Of Triangle     gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple  gl.glVertex3f( -1.5f, -1.5f, -1.5f ); // Right Of Triangle           //left  gl.glColor3f( 1.0f, 1.0f, 0.0f ); // Yellow  gl.glVertex3f( 1.5f, 2.0f, 0.0f ); // Top Of Triangle     gl.glColor3f( 1.0f, 0.0f, 1.0f ); // Purple  gl.glVertex3f( -1.5f, -1.5f, -1.5f ); // Left Of Triangle     gl.glColor3f( 0.0f, 1.0f, 0.0f ); // Green  gl.glVertex3f( -1.5f, -1.5f, 1.5f ); // Right Of Triangle     gl.glEnd();   gl.glFlush();  rotation += 0.6f;     }       @Override  public void dispose( GLAutoDrawable drawable ) {        //method body     }       @Override  public void init( GLAutoDrawable drawable ) {        //method body     }       @Override  public void reshape( GLAutoDrawable drawable, int x, int y, int width, int height ) {    final GL2 gl = drawable.getGL().getGL2();  if(height<=0)  height = 1;    final float h = ( float ) width / ( float ) height;  gl.glViewport( 0, 0, width, height );  gl.glMatrixMode( GL2.GL_PROJECTION );  gl.glLoadIdentity();    glu.gluPerspective( 45.0f, h, 1.0, 20.0 );  gl.glMatrixMode( GL2.GL_MODELVIEW );  gl.glLoadIdentity();     }    public static void main( String[] args ) {    final GLProfile gp = GLProfile.get( GLProfile.GL2 );  GLCapabilities cap = new GLCapabilities(gp );    final GLCanvas gc = new GLCanvas( cap );        J3DTriangle triangle = new J3DTriangle();    gc.addGLEventListener( triangle );  gc.setSize( 400, 400 );    final JFrame frame = new JFrame( “3D Triangle” );    frame.add(gc);  frame.setSize(500,400);  frame.setVisible(true);        final FPSAnimator animator = new FPSAnimator(gc,400,true);  animator.start();     }    }  

Output:

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