Line of sight

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The line of sight of a tower is the area of the map where towers can detect Bloons and target them for attacks. For most towers in the ''Bloons TD'' series, this area is indicated by a semi-transparent blue highlight (other colors such as white or cyan can be used depending on the accessibility settings) which is visible when a tower is selected. However, in specific scenarios, towers might be prevented from attacking on certain directions due the presence of obstacles known as '''line of sight blockers''', and if present inside a tower's display range, the blocked areas will be highlighted with red (or black, again depending on accessibility settings).

The choice between different targets ([[targeting option]]) will only consider Bloons in the tower's line of sight. Specific line of sight mechanics depend not only on the tower, but also on the specific attack they are performing, which can be broadly classified on several categories:

The choice between different targets ([[targeting option]]) will only consider Bloons in the tower's line of sight and is checked in the frame where the attack would start, then, attacks and projectiles will continue moving as normal even if the intended target exits the line of sight. Specific line of sight mechanics depend not only on the tower, but also on the specific attack they are performing, which can be broadly classified on several categories:

==== Regular towers and attacks ====

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Usually, projectiles of these towers will also be destroyed if they collide with a line of sight blocker, but other projectiles can continue traveling and hit other Bloons behind cover, even if they are not the intended target. Certain towers may also have the innate capability (or be granted by an upgrade) to bypass all of these line of sight blockers and have their line of sight being equal to their display range, (e.g. [[Adora]] or the [[Guided Magic]] upgrade for [[Wizard Monkey|Wizard Monkeys]] in both BTD6 and BTDB2).

Towers in this category will only attack Bloons if the following 3 conditions are true:

For these towers, their line of sight is the remaining portion of their display range that was not obscured by line of sight blockers. Towers in this category will only attack Bloons if the following 3 conditions are true:

* Any portion of the Bloon's hitbox is inside the display range of the tower.

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==== Flying towers ====

Certain towers can bypass the line of sight blockers by flying over the map, and in this case, their line of sight is independent from their display range, shown in the tower's base. For actually attacking the Bloons some towers (e.g. [[Monkey Ace]]) will continuously attack, even if there are no Bloons nearby, and others (e.g. [[Heli Pilot]]) will only start attacking when Bloons are present inside a "detection area" with is a circle with a certain radius, centered on the flying unit and traveling alongside it. The projectiles of these towers can hit any valid target regardless of the terrain height or obstacles in the way and won't be destroyed by any blocker.<gallery mode="slideshow">

Certain towers can bypass the line of sight blockers by flying over the map, and in this case, their line of sight is independent from their display range, shown in the tower's base. For actually attacking the Bloons some towers (e.g. [[Monkey Ace]]) will continuously attack, even if there are no Bloons nearby, and others (e.g. [[Heli Pilot]]) will only start attacking when Bloons are present inside a "detection area" with is a circle with a certain radius, centered on the flying unit and traveling alongside it. The projectiles of these towers can hit any valid target regardless of the terrain height or obstacles in the way and won't be destroyed by any blocker.

The line of sight of flying towers is their detection range, which can be of a specific radius, or even have map-wide reach. Towers in the detection range sub-category will only attack Bloons if the following 2 conditions are true:

* Any portion of the Bloon's hitbox is inside the detection range of the flying unit.

* The tower is not prevented from attacking the Bloon by other factors.

File:BTD6 LOS flying attack.png|Flying towers can bypass line of sight blockers, the main attack of Monkey Aces will fire continuously, even if no Bloons are nearby, and their projectiles won't be destroyed even if they hit a blocker, like the wall in the center.

File:BTD6 LOS flying close.png|Other flying towers will only attack Bloons if they are close to them, which is limited by an invisible circle-shaped which is centered and moved around with the flying unit.

File:BTD6 LOS flying close.png|Other flying towers will only attack Bloons if they are close to them, which is limited by an invisible circle-shaped area which is centered and moved around with the flying unit.

File:BTD6 LOS flying far.png|If the Bloon is outside the detection zone, it won't be attacked by flying towers.

</gallery>

==== Global range towers and attacks ====

Other towers are capable of targeting and attacking Bloons outside their display range, extending their own line of sight in all directions, sometimes even map-wide. [[Sniper Monkey|Sniper Monkeys]] are the most common example, they can attack to any location in the map as long they are not impeded by line of sight blockers. For these kind of towers, areas where the tower can attack are not highlighted while the tower is selected (except their display range), but the blocked areas will be highlighted in red. On the opposite side, towers like [[Psi]] also have global range, but their line of sight is not affected by obstacles and can attack map-wide.<gallery mode="slideshow">

Other towers are capable of targeting and attacking Bloons outside their display range, extending their own line of sight in all directions, sometimes even map-wide. [[Sniper Monkey|Sniper Monkeys]] are the most common example, they can attack to any location in the map as long they are not impeded by line of sight blockers. For these kind of towers, areas where the tower can attack are not highlighted while the tower is selected (except their display range), but the blocked areas will be highlighted in red. On the opposite side, towers like [[Psi]] also have global range, but their line of sight is not affected by obstacles and can attack map-wide.

The line of sight of towers with global range that are affected by blockers will be any portion of the map that would not be obscured by the blockers (visualized by the red highlighted areas when the tower is selected) and for the towers that ignore the blockers, their line of sight is the entire map. Towers in this category will only attack Bloons if the following conditions are true:

* It is possible to draw a straight line from the tower's center to any part of the Bloon's hitbox without touching a line of sight blocker. For towers that ignore the blockers, this requirement s not needed.

* The tower is not prevented from attacking the Bloon by other factors.

File:BTD6 LOS global.png|Monkey Snipers are able to attack any Bloon in the map, but they need to have a clear line of sight, in this case the middle wall prevents them from seeing the MOAB, but will start attacking as soon it turns around the corner. In this case, the tower's line of sight does not match its display range.

File:BTD6 LOS global bypass.png|Other towers like Psi can ignore line of sight blockers and attack Bloons anywhere in the map (notice the lack of red zones). In this and the Sniper case, the small circle around the tower is used as the map areas that can be shared with other towers, and not their global range.

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Some towers will only attack continuously towards a point specified by the player, so they bypass the line of sight mechanic entirely, these can be classified in two categories according to their mechanic projectiles:

* '''Straight shooters''': This includes towers like [[Dartling Gunner]] or attacks like the [[Arctic Knight]] Ice Jet ability, they fire in the general direction specified by the player, but their projectiles will be destroyed (or bounce) upon touching a line of sight blocker or the edge of the map. If given the ability to target Bloons automatically (e.g. [[Bloon Area Denial System]]), they will behave like a global range tower with line of sight ~~blocker limitations~~.

* '''Straight shooters''': This includes towers like [[Dartling Gunner]] or attacks like the [[Arctic Knight]] Ice Jet ability, they fire in the general direction specified by the player, but their projectiles will be destroyed (or bounce) upon touching a line of sight blocker or the edge of the map. If given the ability to target Bloons automatically (e.g. [[Bloon Area Denial System]]), they will behave like a global range tower with blocker limitations and their line of sight is the same as these kind of towers.

* '''Lobbed shooters''': This includes towers like [[Mortar Monkey]] or [[Spike Factory]] in the "Set Target" targeting option (via [[Smart Spikes]] upgrade), they fire in the general direction specified by the player, but their projectiles will always reach their target, even if set to a location far from the track. If given the ability to target Bloons automatically (e.g. [[Dynamic Targeting]]), they will behave like a global range tower without line of sight ~~blocker limitations~~.

* '''Lobbed shooters''': This includes towers like [[Mortar Monkey]] or [[Spike Factory]] in the "Set Target" targeting option (via [[Smart Spikes]] upgrade), they fire in the general direction specified by the player, but their projectiles will always reach their target, even if set to a location far from the track. If given the ability to target Bloons automatically (e.g. [[Dynamic Targeting]]), they will behave like a global range tower without blocker limitations and their line of sight is the same as these kind of towers.

File:BTD6 LOS manual targeting.png|Some towers like Dartling Gunners are able to attack in any direction as the player chooses, but it doesn't mean they can bypass line of sight blockers, which will destroy their projectiles upon contact.

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Certain attacks are able to attack Bloons present in the display range of other towers, the most prominent example are [[Monkey Sub|Monkey Subs]] with the [[Advanced Intel]] upgrade, which allows them attack towers located far from them, with some limitations, for example, the subs cannot use their main dart attack towards the range of other tower if the sub itself does not have a clear line of sight, but it can use other attacks such as [[Ballistic Missile]] even if the range of the other tower is completely inside a blocked zone.

To be able to hit Camo Bloons, the tower that is sharing its range must have [[Camo detection]], even if the far attacking tower is able to see Camo naturally (e.g. [[Silas]]). And for ~~towers with~~ flying, global range or manual targeting line of sight ~~mechanics~~ will only ~~share~~ their ~~small display~~ range.<gallery mode="slideshow">

To be able to hit Camo Bloons, the tower that is sharing its range must have [[Camo detection]], even if the far attacking tower is able to see Camo naturally (e.g. [[Silas]]). And for flying, global range or manual targeting towers, they are only able to share their small display range.

The line of sight of towers in this category will be the sum of their own line of sight plus the overlap between the display range and line of sight of other towers that can share with them. Towers will only attack Bloons in a shared range area if the following conditions are true:

*Any part of the Bloon's hitbox is both inside the display range and the line of sight of the tower that is sharing their range.

*It is possible to draw a straight line from the attacking tower's center to the portion of the Bloon's hitbox defined by the previous condition without touching a line of sight blocker. For towers that ignore the blockers, this requirement s not needed.

*If the target is a Camo Bloon, the tower that is sharing range needs to have Camo detection.

* The attacking tower is not prevented from attacking the Bloon by other factors.

File:BTD6 LOS shared.png|Monkey Subs with the Advanced Intel upgrade can attack towards the range of other towers, but to use their main dart attack on a distant target, they need to have a clear line of sight, meaning this sub will never attack the Bloons in the range of the left Dart Monkey.

File:BTD6 LOS shared bypass.png|The line of sight restriction is applied in an attack by attack basis, in this case, if a Monkey Sub has both Advanced Intel and Ballistic Missile upgrades, it will be able to use the Missile to attack Bloons in the range of the left Dart Monkey, but not with its main dart attack.

File:BTD6 LOS Silas.png|Another example of a shared range tower with line of sight blockers, Silas can attack the MOAB in the range of the Ice Monkey, even if the Ice Monkey itself can't target MOAB-Class Bloons naturally.

File:BTD6 LOS Silas blocked.png|~~If both~~ the ~~attacking tower and the tower that is sharing~~ its ~~range cannot see the Bloon~~, ~~neither tower will be~~ able to attack it.

File:BTD6 LOS Silas blocked.png|The Ceramic Bloon is inside the Ice Monkey's display range, but not in its line of sight, so Silas is not able to attack it.

File:BTD6 LOS no camo.png|Towers with shared range attacks cannot target Camo Bloons if the tower that is sharing does not have Camo detection. This is also true if the attacking tower has Camo detection itself.

File:BTD6 LOS camo.png|A tower with camo detection sharing its range.

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 The line of sight of a tower is the area of the map where towers can detect Bloons and target them for attacks. For most towers in the ''Bloons TD'' series, this area is indicated by a semi-transparent blue highlight (other colors such as white or cyan can be used depending on the accessibility settings) which is visible when a tower is selected. However, in specific scenarios, towers might be prevented from attacking on certain directions due the presence of obstacles known as '''line of sight blockers''', and if present inside a tower's display range, the blocked areas will be highlighted with red (or black, again depending on accessibility settings).
-The choice between different targets ([[targeting option]]) will only consider Bloons in the tower's line of sight. Specific line of sight mechanics depend not only on the tower, but also on the specific attack they are performing, which can be broadly classified on several categories:
+The choice between different targets ([[targeting option]]) will only consider Bloons in the tower's line of sight and is checked in the frame where the attack would start, then, attacks and projectiles will continue moving as normal even if the intended target exits the line of sight. Specific line of sight mechanics depend not only on the tower, but also on the specific attack they are performing, which can be broadly classified on several categories:
 ==== Regular towers and attacks ====
@@ Line 23: / Line 23: @@
 Usually, projectiles of these towers will also be destroyed if they collide with a line of sight blocker, but other projectiles can continue traveling and hit other Bloons behind cover, even if they are not the intended target. Certain towers may also have the innate capability (or be granted by an upgrade) to bypass all of these line of sight blockers and have their line of sight being equal to their display range, (e.g. [[Adora]] or the [[Guided Magic]] upgrade for [[Wizard Monkey|Wizard Monkeys]] in both BTD6 and BTDB2).
-Towers in this category will only attack Bloons if the following 3 conditions are true:
+For these towers, their line of sight is the remaining portion of their display range that was not obscured by line of sight blockers. Towers in this category will only attack Bloons if the following 3 conditions are true:
 * Any portion of the Bloon's hitbox is inside the display range of the tower.
@@ Line 37: / Line 37: @@
 ==== Flying towers ====
-Certain towers can bypass the line of sight blockers by flying over the map, and in this case, their line of sight is independent from their display range, shown in the tower's base. For actually attacking the Bloons some towers (e.g. [[Monkey Ace]]) will continuously attack, even if there are no Bloons nearby, and others (e.g. [[Heli Pilot]]) will only start attacking when Bloons are present inside a "detection area"  with is a circle with a certain radius, centered on the flying unit and traveling alongside it. The projectiles of these towers can hit any valid target regardless of the terrain height or obstacles in the way and won't be destroyed by any blocker.<gallery mode="slideshow">
+Certain towers can bypass the line of sight blockers by flying over the map, and in this case, their line of sight is independent from their display range, shown in the tower's base. For actually attacking the Bloons some towers (e.g. [[Monkey Ace]]) will continuously attack, even if there are no Bloons nearby, and others (e.g. [[Heli Pilot]]) will only start attacking when Bloons are present inside a "detection area"  with is a circle with a certain radius, centered on the flying unit and traveling alongside it. The projectiles of these towers can hit any valid target regardless of the terrain height or obstacles in the way and won't be destroyed by any blocker.
+The line of sight of flying towers is their detection range, which can be of a specific radius, or even have map-wide reach. Towers in the detection range sub-category will only attack Bloons if the following 2 conditions are true:
+* Any portion of the Bloon's hitbox is inside the detection range of the flying unit.
+* The tower is not prevented from attacking the Bloon by other factors.
+<gallery mode="slideshow">
 File:BTD6 LOS flying attack.png|Flying towers can bypass line of sight blockers, the main attack of Monkey Aces will fire continuously, even if no Bloons are nearby, and their projectiles won't be destroyed even if they hit a blocker, like the wall in the center.
-File:BTD6 LOS flying close.png|Other flying towers will only attack Bloons if they are close to them, which is limited by an invisible circle-shaped which is centered and moved around with the flying unit.
+File:BTD6 LOS flying close.png|Other flying towers will only attack Bloons if they are close to them, which is limited by an invisible circle-shaped area which is centered and moved around with the flying unit.
 File:BTD6 LOS flying far.png|If the Bloon is outside the detection zone, it won't be attacked by flying towers.
 </gallery>
 ==== Global range towers and attacks ====
-Other towers are capable of targeting and attacking Bloons outside their display range, extending their own line of sight in all directions, sometimes even map-wide. [[Sniper Monkey|Sniper Monkeys]] are the most common example, they can attack to any location in the map as long they are not impeded by line of sight blockers. For these kind of towers, areas where the tower can attack are not highlighted while the tower is selected (except their display range), but the blocked areas will be highlighted in red. On the opposite side, towers like [[Psi]] also have global range, but their line of sight is not affected by obstacles and can attack map-wide.<gallery mode="slideshow">
+Other towers are capable of targeting and attacking Bloons outside their display range, extending their own line of sight in all directions, sometimes even map-wide. [[Sniper Monkey|Sniper Monkeys]] are the most common example, they can attack to any location in the map as long they are not impeded by line of sight blockers. For these kind of towers, areas where the tower can attack are not highlighted while the tower is selected (except their display range), but the blocked areas will be highlighted in red. On the opposite side, towers like [[Psi]] also have global range, but their line of sight is not affected by obstacles and can attack map-wide.
+The line of sight of towers with global range that are affected by blockers will be any portion of the map that would not be obscured by the blockers (visualized by the red highlighted areas when the tower is selected) and for the towers that ignore the blockers, their line of sight is the entire map. Towers in this category will only attack Bloons if the following conditions are true:
+* It is possible to draw a straight line from the tower's center to any part of the Bloon's hitbox without touching a line of sight blocker. For towers that ignore the blockers, this requirement s not needed.
+* The tower is not prevented from attacking the Bloon by other factors.
+<gallery mode="slideshow">
 File:BTD6 LOS global.png|Monkey Snipers are able to attack any Bloon in the map, but they need to have a clear line of sight, in this case the middle wall prevents them from seeing the MOAB, but will start attacking as soon it turns around the corner. In this case, the tower's line of sight does not match its display range.
 File:BTD6 LOS global bypass.png|Other towers like Psi can ignore line of sight blockers and attack Bloons anywhere in the map (notice the lack of red zones). In this and the Sniper case, the small circle around the tower is used as the map areas that can be shared with other towers, and not their global range.
@@ Line 52: / Line 62: @@
 Some towers will only attack continuously towards a point specified by the player, so they bypass the line of sight mechanic entirely, these can be classified in two categories according to their mechanic projectiles:
-* '''Straight shooters''': This includes towers like [[Dartling Gunner]] or attacks like the [[Arctic Knight]] Ice Jet ability, they fire in the general direction specified by the player, but their projectiles will be destroyed (or bounce) upon touching a line of sight blocker or the edge of the map. If given the ability to target Bloons automatically (e.g. [[Bloon Area Denial System]]), they will behave like a global range tower with line of sight blocker limitations.
+* '''Straight shooters''': This includes towers like [[Dartling Gunner]] or attacks like the [[Arctic Knight]] Ice Jet ability, they fire in the general direction specified by the player, but their projectiles will be destroyed (or bounce) upon touching a line of sight blocker or the edge of the map. If given the ability to target Bloons automatically (e.g. [[Bloon Area Denial System]]), they will behave like a global range tower with blocker limitations and their line of sight is the same as these kind of towers.
-* '''Lobbed shooters''': This includes towers like [[Mortar Monkey]] or [[Spike Factory]] in the "Set Target" targeting option (via [[Smart Spikes]] upgrade), they fire in the general direction specified by the player, but their projectiles will always reach their target, even if set to a location far from the track. If given the ability to target Bloons automatically (e.g. [[Dynamic Targeting]]), they will behave like a global range tower without line of sight blocker limitations.
+* '''Lobbed shooters''': This includes towers like [[Mortar Monkey]] or [[Spike Factory]] in the "Set Target" targeting option (via [[Smart Spikes]] upgrade), they fire in the general direction specified by the player, but their projectiles will always reach their target, even if set to a location far from the track. If given the ability to target Bloons automatically (e.g. [[Dynamic Targeting]]), they will behave like a global range tower without blocker limitations and their line of sight is the same as these kind of towers.
 <gallery mode="slideshow">
 File:BTD6 LOS manual targeting.png|Some towers like Dartling Gunners are able to attack in any direction as the player chooses, but it doesn't mean they can bypass line of sight blockers, which will destroy their projectiles upon contact.
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 Certain attacks are able to attack Bloons present in the display range of other towers, the most prominent example are [[Monkey Sub|Monkey Subs]] with the [[Advanced Intel]] upgrade, which allows them attack towers located far from them, with some limitations, for example, the subs cannot use their main dart attack towards the range of other tower if the sub itself does not have a clear line of sight, but it can use other attacks such as [[Ballistic Missile]] even if the range of the other tower is completely inside a blocked zone.
-To be able to hit Camo Bloons, the tower that is sharing its range must have [[Camo detection]], even if the far attacking tower is able to see Camo naturally (e.g. [[Silas]]). And for towers with flying, global range or manual targeting line of sight mechanics will only share their small display range.<gallery mode="slideshow">
+To be able to hit Camo Bloons, the tower that is sharing its range must have [[Camo detection]], even if the far attacking tower is able to see Camo naturally (e.g. [[Silas]]). And for flying, global range or manual targeting towers, they are only able to share their small display range.
+The line of sight of towers in this category will be the sum of their own line of sight plus the overlap between the display range and line of sight of other towers that can share with them. Towers will only attack Bloons in a shared range area if the following conditions are true:
+*Any part of the Bloon's hitbox is both inside the display range and the line of sight of the tower that is sharing their range.
+*It is possible to draw a straight line from the attacking tower's center to the portion of the Bloon's hitbox defined by the previous condition without touching a line of sight blocker. For towers that ignore the blockers, this requirement s not needed.
+*If the target is a Camo Bloon, the tower that is sharing range needs to have Camo detection.
+* The attacking tower is not prevented from attacking the Bloon by other factors.
+<gallery mode="slideshow">
 File:BTD6 LOS shared.png|Monkey Subs with the Advanced Intel upgrade can attack towards the range of other towers, but to use their main dart attack on a distant target, they need to have a clear line of sight, meaning this sub will never attack the Bloons in the range of the left Dart Monkey.
 File:BTD6 LOS shared bypass.png|The line of sight restriction is applied in an attack by attack basis, in this case, if a Monkey Sub has both Advanced Intel and Ballistic Missile upgrades, it will be able to use the Missile to attack Bloons in the range of the left Dart Monkey, but not with its main dart attack.
 File:BTD6 LOS Silas.png|Another example of a shared range tower with line of sight blockers, Silas can attack the MOAB in the range of the Ice Monkey, even if the Ice Monkey itself can't target MOAB-Class Bloons naturally.
-File:BTD6 LOS Silas blocked.png|If both the attacking tower and the tower that is sharing its range cannot see the Bloon, neither tower will be able to attack it.
+File:BTD6 LOS Silas blocked.png|The Ceramic Bloon is inside the Ice Monkey's display range, but not in its line of sight, so Silas is not able to attack it.
 File:BTD6 LOS no camo.png|Towers with shared range attacks cannot target Camo Bloons if the tower that is sharing does not have Camo detection. This is also true if the attacking tower has Camo detection itself.
 File:BTD6 LOS camo.png|A tower with camo detection sharing its range.

Line of sight: Difference between revisions