# Tessellation Error?

**URL:** <https://discourse.processing.org/t/tessellation-error/1164>\
**Category:** Processing\
**Created:** [June 22, 2018, 8:50am UTC](https://discourse.processing.org/t/tessellation-error/1164 "2018-06-22T08:50:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![KAZ](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kaz/32/2402_2.png) [@KAZ](https://discourse.processing.org/u/KAZ)\
**Post date:** [June 22, 2018, 8:50am UTC](https://discourse.processing.org/t/tessellation-error/1164/1 "2018-06-22T08:50:58Z")

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Am doing some Planetary System Simulation stuff . It’s doing well apart from occasionally , when I launch a planet too much near the sun the planet move through the sun very fast and the console spits out this error in bright red letters

“Tessellation Error: gluTessBeginContour() must precede a gluTessEndContour()”

Of course I can do a bit of validation coding, but I am wondering What does this error mean and what it has to do with my code.

The code is available in the gihub link.

> **[KAZ-SYED-ABUTHAHIR/ExplorePlanetaryOrbits](https://github.com/KAZ-SYED-ABUTHAHIR/ExplorePlanetaryOrbits/tree/master/PlanetaryAdventures12)**
>
> Simulation of Planetary Orbits Where Users can click/drag to launch their planets - KAZ-SYED-ABUTHAHIR/ExplorePlanetaryOrbits

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**Author:** ![JoLi](https://avatars.discourse-cdn.com/v4/letter/j/e495f1/32.png) [@JoLi](https://discourse.processing.org/u/JoLi)\
**Post date:** [September 29, 2020, 5:22am UTC](https://discourse.processing.org/t/tessellation-error/1164/2 "2020-09-29T05:22:22Z")

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I get the same error on my sketch just when launching it