[SOLVED] LWJGL Visual Illusion Problem

Newbie & Debugging Questions
#1

Hi, so I obtained source code from http://www.youtube.com/watch?v=O0xtgfcxcq0&feature=plcp but noticed a strange visual effect.

I plugged in the code and when looking directly down onto a block this occurred.

I have jumped around with learning OpenGL but I’ve firmly started recently but I havn’t been able to resolve the issue, yet.

Here is parts of the code that hopefully explains the problem

      static int width=800, height=600;
// ---------------------------------------------------------------------------------
		DisplayMode dm = new DisplayMode(width,height);
		for(DisplayMode mode : Display.getAvailableDisplayModes()){
			if(mode.getWidth() == 800 && mode.getHeight() == 600 && mode.isFullscreenCapable() && mode.getBitsPerPixel() == 32){
				dm = mode;
				break;
			}
		}
		if(dm.isFullscreenCapable()) Display.setFullscreen(false);
		Display.setDisplayMode(dm);
		Display.create();
// ------------------------------------------------------------------------------------

	private void initGL3() {
		GL11.glMatrixMode(GL11.GL_PROJECTION);
		GL11.glLoadIdentity();

		GLU.gluPerspective((float) 100, App.width / App.height, 0.001f, 1000);
		GL11.glMatrixMode(GL11.GL_MODELVIEW);

		GL11.glEnable(GL11.GL_TEXTURE_2D);
		GL11.glShadeModel(GL11.GL_SMOOTH);
		GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
		GL11.glClearDepth(1.0f);
		GL11.glEnable(GL11.GL_DEPTH_TEST);
		GL11.glDepthFunc(GL11.GL_LEQUAL);
	}

//    This is one of the crates that are being drawn.
//    float startX, float startY, float startZ, float endX, float endY, float endZ, Texture texSurround
		collidable.add(new PolyVoxel(20, 0.1f, 2, 22, 2, 4, texCrate));

// Rotation values are created from mouse movement (FPS camera).
	public void translateCamera() {
		GL11.glRotatef(rotation.x, 1, 0, 0);
		GL11.glRotatef(rotation.y, 0, 1, 0);
		GL11.glRotatef(rotation.z, 0, 0, 1);
		GL11.glTranslatef(-vector.x, -vector.y - 1.4f, -vector.z);
	}

Sorry for the long post, if someone could point me in the right direction I would be grateful, thanks for your time.

#2

Your call to GLU.gluPerspective() most likely screws up the aspect ratio. App.width and App.height are both ints, right? That means that App.width / App.height = 1 in most cases since effectively the decimals are getting cut off. You should just change it to

(float)App.width / App.height

which should solve the problem.

#3

That usually means you’ve got your aspect ratio (second parameter to gluPerspective) wrong.

Are App.width and App.height ints? Because you may be getting integer divide so your aspect is incorrectly 1 rather than 1.6 (or whatever).

Edit: Spooky double post! :persecutioncomplex:

#4

18 seconds too slow, sucker! ;D

#5

Excellent! Thank you so much, that solved the issue. (Credits go to the answer that is 18 seconds faster of course :point:)

#6

Yatta! 8)