gazebosim / gazebosim/gz-rendering

Only one side of the triangles is visible in Marker Triangle List

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bug help wanted
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C++
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Description

I was recently working with the Triangle list Marker geometry and noticed that only one side of the triangles is visible. I am not sure if this is a bug or intended behavior. I spawned 10 * 10 * 10 triangles into the scene using `MarkerType::TRIANGLE_LIST`. Please have a look at the following gif:

![triangle_list_trim](https://user-images.githubusercontent.com/33201532/95770423-00737280-0cd7-11eb-91d1-31c3ca6fd2ce.gif)

|Details||
|---|---|
|Tested On|Ubuntu 20.04|
|Rendering Engine|OGRE and OGRE2|
|Libraries|`ign-rendering4` and `ign-gui4`'s `Scene3D` plugin|

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