anti-aliased lines using glLines or... ?

OpenGL Development JOGL Development
#1

Hi, I have a quick question that I can’t find the answer to… Is there a way to make the lines look nice using the glLines method, or some other method? Even when I set the glLineWidth to .5f or .1f it looks very blocky. Also it doesn’t change size as it gets further from the camera. Sorry if this is a stupid question, I can’t find the answer and am hoping someone can point me in the right direction to a simple and obvious solution. -sj

#2

try this:

gl.glHint(GL.GL_LINE_SMOOTH_HINT, GL.GL_NICEST);

docu: http://www.opengl.org/documentation/specs/man_pages/hardcopy/GL/html/gl/hint.html

#3

Thanks Emzic,

this combo of enablings/hints seems to look the best.

gl.glEnable(GL.GL_LINE_SMOOTH);
gl.glHint(GL.GL_LINE_SMOOTH_HINT, GL.GL_NICEST);
gl.glEnable(GL.GL_BLEND);
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
gl.glLineWidth(.5f);

However, I can’t figure out a good way to get the lines to look correct at different distances. glLines seems to keep the width the same no matter what the distance from the camera. That is, I think that what I really want is a super-thin textured cylinder…

-sj

#4

yes, a line will always have the same thickness no matter at what distance it is drawn. this is true for points as well.

#5

with glPointparameter, it is possible to change the pointsize in proportion to de distance.
example


float linear[] = {0.0f, 0.12f, 0.0f};
gl.glPointParameterfv(GL.GL_POINT_DISTANCE_ATTENUATION, linear, 0);

This is not possible with lines.

Stupid question from me, if a cilinder is textured, do you stil see the lines?