One thing I am seeing from the relevant reading at
http://www.opengl.org/sdk/docs/man/xhtml/glLineWidth.xml is that you
should not be setting the line width to be less than one pixel.

On Jul 29, 10:12 pm, SChaser <[email protected]> wrote:
> I am drawing lines in OpenGL on an app that will zoom way in and out
> on the surface. I would like the lines to always be visible.
>
> Currently, when the line widths are small, at certain angles, the
> lines don't render. Specifically, I have a case where diagonal lines
> show but a horizontal one does not. The line width is way less than a
> pixel, but there is nothing else in the area of the pixels that are
> not being colored.
>
> Is there a way to force sub-pixel elements to cause the enclosing
> pixel (otherwise empty - nothing drawn there) to render the color of
> the sub-pixel element?
>
> What is the rendering algorithm that causes the sub-pixel line to
> render when at an angle but not when horizontal (and hence, at the
> same position in every pixel)? Can I change it?
>
> Is there any way to do this other than changing the line width based
> on the scaling I am doing to the underlying model as I display it on
> the surface?
>
> Tks

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