I need a "sight zone"

[K_Tetsu]

Hi there,

so im bulding a canon in MMf2. For now I made multiple Duplicates [instances] of the canon with each one having a object [a square = line of sight] overlapping it so if the player is entering this area he will be shot .

So my problem ist that i also said if the player leaves the square he should stop shooting. But if i place several isntances in a row the squares over the canons are overlaping each other [because of the order] in the place where they overlap each other only the square "counts" which is on the top of the layer. [thats beacause the player only can overlap this area ]

Is there a way to make something like this "line of sight" square without being a object or someting like objects which has the same order number and not overlapping each other?

So the best thing would be something light this quare (or triangle etc!) which represents a zone rather than an object is there something which can do this?

my english ist not very good I hope you can understand my Issue.

[paobrasil]

My friend go here: http://www.castles-of-britain.com/mmf2examples.htm

there's a source files in C-D examples that talk about distances......

[K_Tetsu]

Thank you, I managed it with the Absolut value of the difference of the xpositions. Are there any codes for some shapes like a triangle for this method?

[King_Cool]

I can teach you how to do a "pizza slice" type Line Of Sight wich will work for each individuall cannon without using any additional objects.

Is this what you are after?

[geothefaust]

I can teach you how to do a "pizza slice" type Line Of Sight wich will work for each individuall cannon without using any additional objects.

Is this what you are after?

I would love to hear about it.

[geothefaust]

I can teach you how to do a "pizza slice" type Line Of Sight wich will work for each individuall cannon without using any additional objects.

Is this what you are after?

Hi King Cool. Is this something you've already typed up somewhere, or is it something you would need to type?

[K_Tetsu]

I can teach you how to do a "pizza slice" type Line Of Sight wich will work for each individuall cannon without using any additional objects.

Is this what you are after?

Yes thats what Im looking for, the best would be some manually generated cornerpoits by a 1x1pixel object but a static one wuld be good too !

[King_Cool]

Sorry for the late reply.

Yes PixelatedPic, i have explained this on several occasions asi can remember, maybe ill make an article about this sort of thing sometime.

Its importaint when you do this that you use Angle values instead of direction values for your Cannons direction. If your using directions instead of Angles, you can easily get the Angle value of the Direction by multiplying the Direction with 11.25

...
FIRST 'DETECTION RADIUS'
Lets say you have 3 Cannons, and you want each Cannon to be able to detect the Player when he ventures inside their detection radiuslike this:


...
Youl have to give your Cannons 1 piece of AI, in the form of an AlterableValue.
DistanceToPlayer_
This piece of data should be the distance between the Cannon and the Player, and you do it like this ( using the ADO extencion ):

Allways
- Cannon set DistanceToPlayer_ to ( ADO ) LongDist( Xcannon, Ycannon, Xplayer, Yplayer )

...
To make the Cannons able to detect the Player simply do:

If DistanceToPlayer_ is lower or equal to 100
- Your action ( Cannon is detecting the Player )

If DistanceToPlayer_ is greater than 100
- Your action ( Cannon is NOT detecting the Player )

...
This will make your Cannons have an invissible detection radius of 100 pixels.

SECOND 'VIEW ANGLE'
Lets say you have 3 Cannons, and you want each Cannon to be able to detect the Player when facing him, like this:


...
Youl have to give your Cannons 1 piece of AI, in the form of an AlterableValue.
AngleDifferenceToPlayer_
This piece of data should be the 'absolute difference between two angles', #1 the Cannons facing angle #2 the angle between Cannons possition and Players Possition, and you do it like this ( using the ADO extencion ):

Allways
- Cannon set AngleDifferenceToPlayer_ to ( ADO ) DirDiffAbs( Cannon Angle, (ADO)LongDir( Xcannon, Ycannon, Xplayer, Yplayer) )

...
To make the Cannons able to detect the Player simply do:

If AngleDifferenceToPlayer_ is lower or equal to 60 / 2
- Your action ( Cannon is detecting the Player )

If AngleDifferenceToPlayer_ is greater than 60 / 2
- Your action ( Cannon is NOT detecting the Player )

...
This will make your Cannons have an invissible endless 60 degree detection field in the direction they are facing.

COMBINE THE TWO
If you combine the two detection methods you will get an invissible Pizza Slice type Line Of Sight, like this:


...
To make the Cannons able to detect the Player simply do:

If DistanceToPlayer_ is lower or equal to 100
If AngleDifferenceToPlayer_ is lower or equal to 60 / 2
- Your action ( Cannon is detecting the Player )

If DistanceToPlayer_ is greater than 100
OR ( logical )
If AngleDifferenceToPlayer_ is greater than 60 / 2
- Your action ( Cannon is NOT detecting the Player )

...
If you increase/ reduce the Cannons 'detection radius' ( 100 in the example above ), Cannons wil get a longer/ shorter Line Of Sight.


If you increase/ reduce the Cannons 'view angle' ( 60 in the example above ), Cannons wil get a wider/ narrower Line Of Sight.


...
Hope i was able to explaing this in an understandable way ( smiley face )

The way i explain the code and use the variables is not the most optimized or flexible way of doing it, but rather my goal for this post was to explain the basic ideas of how to achieve this sort of invissible Line Of Sight, wich i hope i have been able to do in a good way.

[K_Tetsu]

...
Hope i was able to explaing this in an understandable way ( smiley face )

The way i explain the code and use the variables is not the most optimized or flexible way of doing it, but rather my goal for this post was to explain the basic ideas of how to achieve this sort of invissible Line Of Sight, wich i hope i have been able to do in a good way.

Wow this helps alot big THX King Cool

By the way If i actually want to publish a game do I have to buy the extensions/ license to use them like ADO seperatly?

[RockyRaccoon]

Wow this helps alot big THX King Cool

By the way If i actually want to publish a game do I have to buy the extensions/ license to use them like ADO seperatly?

I believe it depends on the extension creator's license , usually, you can learn more in the About Section of the Properties box when you have the object selected, that will tell you if it's 'Free for Non-Commercial Use' or 'Free Use' or have a Link to the Author's Website, where you can find out, or contact the Author to find out.

For example, the 'MoveIt' extension lists this: http://andersriggelsen.dk/ as a Website for the Author, Anders Riggelsen in the about properties box inside MMF2, where it lists his E-mail, Phone Number where you could ask him what the commercial license to use his software is, or if he even has terms for commercial use, or, browse to his clickteam page, where it says they're free for commercial use.