sub pixel accuracy

Game Mechanics
#1

Hi guys, I got a question regarding drawing objects with sub pixel accuracy. I have 2 vertical lines that are 1.5 pixels apart, as I slowly move them horizontally across the screen, I see a seam appearing/disappearing between the 2 lines. Is there any way to get rid of this artifact without increase the screen resolution? Thanks in advance.

#2

Try to google “wu line”.

#3

How is that supposed to help him? Are you suggesting he should anti-alias per hand? very funny.

	g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
	g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

These two commands are called directly after initializing “g” (Graphics2D)

If you’re not sure about the effects, try them seperately. You’ll immediately see what they do.

#4

First of all, pretty sure he’s using LWJGL, not Java2D, and second, relminator’s response may not have been too detailed but for low-level stuff like LWJGL it is important to know how these things work.

#5

Of course, I only looked at the question and not his 9 projects and they’re all 3D, hehe. Still surprised that he would run into problems like this… Shows how much I know!

#6

If using OpenGL related library, this should do it:

glEnable( GL_LINE_SMOOTH );
glEnable( GL_POLYGON_SMOOTH );
glHint( GL_LINE_SMOOTH_HINT, GL_NICEST );
glHint( GL_POLYGON_SMOOTH_HINT, GL_NICEST );

EDIT:

And I think you need blending enabled:

glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);