[V6.29.0 - Ground Combat] arctic maps - grenades thrown onto hills do not splash onto adjacent high ground cliff edge tiles within blast radius

[fusion-waffle]

Description

When previewing throwing a grenade onto a high ground hill tile on arctic maps, high ground tiles along the cliffs (i.e. adjacent to a low ground tile) are not previewed as being impacted by the blast radius if the grenade is targeted at an adjacent high ground tile.

What Happened

Here's an example, recorded from v6.29.0, illustrating the issue during a UFO recovery mission.

 

I am previewing a grenade throw. I have used the scroll wheel to target one height level up from ground level. Note how the blast radius previous is not including cliff edge tiles if a tile on top of the hill is targeted.

Further Information

Please see attached bug report dump for more info (same situation as the example).

 

I've noticed this issue only in arctic maps during two different campaigns. The issue seems limited to "hill" areas only, it does not happen if you preview throwing a grenade on top of a building in arctic maps. I was curious if this issue also impacted hilly areas of non-arctic maps -- but when I experimented with high ground hill areas of a desert map, those worked as expected.

I suspect this issue also impacts what happens when a grenade is actually thrown, not merely the preview.  I first noticed this issue during a previous campaign in an arctic map where a mantid was standing on one of these high ground cliff edge tile. When a flashbang exploded on a high ground tile adjacent to the mantid's tile, the mantid was not suppressed.

Speculation

It is as if, for purposes of grenade splash calculation, these arctic map high ground cliff edge tiles are not regarded as adjacent to any other tile.

 

bug_report_2026-01-15-12h00_gc_6.29.0_user_f11_0.zip

[Kouki]

8 hours ago, fusion-waffle said:

Description

When previewing throwing a grenade onto a high ground hill tile on arctic maps, high ground tiles along the cliffs (i.e. adjacent to a low ground tile) are not previewed as being impacted by the blast radius if the grenade is targeted at an adjacent high ground tile.

What Happened

Here's an example, recorded from v6.29.0, illustrating the issue during a UFO recovery mission.

 

I am previewing a grenade throw. I have used the scroll wheel to target one height level up from ground level. Note how the blast radius previous is not including cliff edge tiles if a tile on top of the hill is targeted.

Further Information

Please see attached bug report dump for more info (same situation as the example).

 

I've noticed this issue only in arctic maps during two different campaigns. The issue seems limited to "hill" areas only, it does not happen if you preview throwing a grenade on top of a building in arctic maps. I was curious if this issue also impacted hilly areas of non-arctic maps -- but when I experimented with high ground hill areas of a desert map, those worked as expected.

I suspect this issue also impacts what happens when a grenade is actually thrown, not merely the preview.  I first noticed this issue during a previous campaign in an arctic map where a mantid was standing on one of these high ground cliff edge tile. When a flashbang exploded on a high ground tile adjacent to the mantid's tile, the mantid was not suppressed.

Speculation

It is as if, for purposes of grenade splash calculation, these arctic map high ground cliff edge tiles are not regarded as adjacent to any other tile.

 

bug_report_2026-01-15-12h00_gc_6.29.0_user_f11_0.zip 50.64 MB · 0 downloads

Thanks for the report! We'll get it fixed