collision debug doesn't work reliably #5055

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1. jfirebaugh

   added

   bug

   on May 17, 2016
2. jfirebaugh

   added

   gl-core-sprint-candidate

   on Sep 12, 2016
3. brunoabinader commented on Oct 7, 2016

   

   brunoabinader

   on Oct 7, 2016

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   I've noticed that debug collisions are rendered as expected when using a style with raster layer only:
   

   However, debug collisions are only rendered on the tiles appearing on the bottom right corner for the examples below:
   
   
4. brunoabinader commented on Oct 7, 2016

   

   brunoabinader

   on Oct 7, 2016

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   Given the examples above, my suspicion is that somehow the tile size affects the way how the collision debug is rendered.
5. brunoabinader commented on Oct 11, 2016

   

   brunoabinader

   on Oct 11, 2016

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   Given the examples above, my suspicion is that somehow the tile size affects the way how the collision debug is rendered.

   Even though we don't always enable stencil test when rendering symbols, we do render collision using the same stencil function. This gets updated on each render call, but only if the bucket needs clipping.

   In the cases above, the render result was unpredictable because it used the last stencil function set by the previous bucket that needed clipping.
6. jfirebaugh commented on Oct 11, 2016

   

   jfirebaugh

   on Oct 11, 2016

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   Thanks for investigating!

   In the cases above, the render result was unpredictable because it used the last stencil function set by the previous bucket that needed clipping.

   This means it's a good example of a bug that will be fixed by #6468.

   🎉React with 🎉1Reacted by Mike Morris
7. brunoabinader

   closed this as completedin #6669on Oct 12, 2016