Cesium: Support stippled lines

[mramato]

I thought we had an issue for this, but I couldn't find one.

We get requests for dashed/dotted lines on the forum all the time, most recently in this thread. Google Earth also has this ability (though not KML). I don't know how difficult it would be to create a material that does this, but it's definitely worth doing when we have the time.

[Deepak-Kumar-D]

Even i don't find an issue with this one. But yeah we can enhance.

[pjcozzi]

Reading:

• Shader-Based Antialiased, Dashed, Stroked Polylines
• Drawing Lines is Hard - entertaining but not specifically about styling.

[prisanto]

Is there any improvements in this matter? If no one is working on it I would like to give it a try. Can you give some tips about where to start it?

[pjcozzi]

@prisanto there's no update here yet. A good place to start is the paper, "Shader-Based Antialiased, Dashed, Stroked Polylines", linked above. Let me know what you think about this approach.

[hpinkos]

Requested again here: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/J_75KkE2mcA

[pjcozzi]

Fixed in #5159 by @jasonbeverage.

[mramato]

@rahwang you might want to go back to the threads linked in this issue and let them know about the new support that will be in 1.32 on May 1st.

[hanokhaloni]

WOOHOO!!!!!