Thread: Doesnt render in 3D with Bitwise Operator '&'

Ive bin making a small game engine and right now im working on the 3Drender portion of it is giving me alot of trouble.

Ive re wrote it twice and for the most part its working but when i try to put them together the screen turns black. My fps counter still counts though so im not sure whats wrong.

public class Render3D extends Render {
	public Render3D(int WIDTH, int LENGTH) {
		super(WIDTH, LENGTH);
	}
 
	public void floor() {
		for (int y = 0; y < LENGTH; y++) {
			double yDepth = y - LENGTH / 2;
			double z = 100.0 / yDepth;
 
			for (int x = 0; x < WIDTH; x++) {
				double xDepth = x - WIDTH / 2;
				xDepth *= z;
				[B]int xx = (int) (xDepth) & 5;[/B]
				PIXELS[x + y * WIDTH] = xx * 135;
 
			}
		}
	}
}

if you look near the bottom theres a portion with the bold tags, thats where im getting the issue I think

thats where im getting the issue I think

How do you know? Your posted code demonstrates nothing of the problem for us because it lacks context, let alone comments on what the methods are actually trying to do, and you've mentioned nothing as far as the calculations - what you expect and what you get. This leaves us with nothing but to guess, sometimes correctly, more often than not incorrectly. Here's my advice: add some println's in there to inspect the values, or throw the code through a debugger. How do the values of these variables differ from what you expect? And finally, if you wish to put your problem into context, then I recommend that you post an SSCCE

Originally Posted by copeg

How do you know? Your posted code demonstrates nothing of the problem for us because it lacks context, let alone comments on what the methods are actually trying to do, and you've mentioned nothing as far as the calculations - what you expect and what you get. This leaves us with nothing but to guess, sometimes correctly, more often than not incorrectly. Here's my advice: add some println's in there to inspect the values, or throw the code through a debugger. How do the values of these variables differ from what you expect? And finally, if you wish to put your problem into context, then I recommend that you post an SSCCE

its not an error per say because I've ran it through me debugger and everything was fine no error codes or anything. its just I was to merge the screens together ill post a pic:

Shifting:

548437728f6737f31dfae2be3d65a622.jpg

Using AND to put the images together:

8cc8156157702df0deb32d8759701f01.jpg

I still don't understand how that code relates to your problem: you have yet to provide an explanation as to what the code is supposed to do - either through an SSCCE, comments, or a description. Why do you want to bitwise and operate against the value 5? What is the method floor supposed to accomplish? As written, how does it try to accomplish that?