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POLWJGL - screen flickering on rendering cycle
 

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    <p>I am developing a 3D visualization application using LWJGL 2.8.5. After reading the first tutorials from the project home page I also went deeper in my analysis reading an OpenGL book. I see the typical procedure in OpenGL is drawing the scene in the init function, then simply calling the update of display in a loop.</p> <p>However, when I try this with LWJGL I get a flickering effect in the display. The only way to eliminate the flickering is to redraw the scene in the display updating cycle. Why is this happening?</p> <p>To better explain my problem I have created a simple class reproducing the problem. It simply draws a quad in the center of the screen, then it goes into the endless screen update loop.</p> <p>Note that if I uncomment the draw call within the cycle, then flickering disappears everything works. Why?</p> <p>Is there anything wrong with my expectation to only draw the objects once and just move the camera to get a different view of a static scene? </p> <p>Here it is the code:</p> <pre><code>package test; import org.lwjgl.LWJGLException; import org.lwjgl.opengl.Display; import org.lwjgl.opengl.DisplayMode; import org.lwjgl.opengl.GL11; import org.lwjgl.util.glu.GLU; import static org.lwjgl.opengl.GL11.*; public class DisplayTest { public static void initGL() { GL11.glViewport(0, 0, 640, 480); glMatrixMode(GL_PROJECTION); GLU.gluPerspective(45.0f, 640f/480f,0.1f, 100.0f); draw(); } public static void draw() { glMatrixMode(GL_MODELVIEW); GL11.glLoadIdentity(); // Reset The Current Modelview Matrix GL11.glTranslatef(0, 0, -6.0f);//Place at the center at -6 depth units //Start drawing a quad //-------------------------------------------------- GL11.glBegin(GL11.GL_QUADS); int size=1; GL11.glColor3f(.3f, .5f, .8f); GL11.glVertex3f(-size/2f,-size/2f,+size/2f); GL11.glVertex3f(+size/2f,-size/2f,+size/2f); GL11.glVertex3f(+size/2f,+size/2f,+size/2f); GL11.glVertex3f(-size/2f,+size/2f,+size/2f); glEnd(); } public static void main(String[] args) { try { // Sets the width of the display to 640 and the height to 480 Display.setDisplayMode(new DisplayMode(640, 480)); // Sets the title of the display Display.setTitle("Drawing a quad"); // Creates and shows the display Display.create(); } catch (LWJGLException e) { e.printStackTrace(); Display.destroy(); System.exit(1); } initGL(); // While we aren't pressing the red button on the display while (!Display.isCloseRequested()) { //draw(); // Update the contents of the display and check for input Display.update(); // Wait until we reach 60 frames-per-second Display.sync(60); } // Destroy the display and render it invisible Display.destroy(); System.exit(0); } } </code></pre>
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