[Trigger] Detecting Distance

noob134 · Sep 23, 2009

Hi, i am making a trigger to check to see if there are any destrucibles blocking the camera. They problem i am having is when it finds distance it will find the distance from the destructible to the unit.
This isnt a problem unless the destructible is on an angle. I have a attached an image to help explain what i am trying to say.

Yixx · Sep 24, 2009

you want to have just the y-component? Or what? Eleborate please

noob134 · Sep 24, 2009

Yixx said:
you want to have just the y-component? Or what? Eleborate please

i want it so the 2 black lines shown in picture will always be perpendicular, so i can find the distance of the black line with check mark next to it.

The region is going to be centered behind the footman when it is moving around. "Lines" are imaginary just trying to use them to help explain

PurplePoot · Sep 25, 2009

Doesn't really work if you are using a region, but basic geometry:

If you have a function of the form ƒ(x) = mx+b, the function perpendicular to ƒ(x) will be ƒ┶(x) = -x/m+b.

noob134 · Sep 25, 2009

PurplePoot said:
Doesn't really work if you are using a region, but basic geometry:

If you have a function of the form ƒ(x) = mx+b, the function perpendicular to ƒ(x) will be ƒ┶(x) = -x/m+b.

what do x, f, m, and b stand for?
Also, if this is what i think it is then it wont work when the unit turns in a different direction.

Adiktuz · Sep 25, 2009

noob134 said:
what do x, f, m, and b stand for?
Also, if this is what i think it is then it wont work when the unit turns in a different direction.

f means function, b is a constant, x is a variable and m is the slope...
f(x)= mx + b is the basic equation of a line....

PurplePoot · Sep 25, 2009

noob134 said:
what do x, f, m, and b stand for?
Also, if this is what i think it is then it wont work when the unit turns in a different direction.

It works for any line given that you actually know the formula (which is easy to work out). You would naturally have to recalculate the formula every time you checked.

If you have two points (a,b) and (x,y) {a≠x}, m and b are as follows:

m = (y-b)/(x-a)

b = y-mx = b-ma

uberfoop · Sep 25, 2009

Well, I built a solution, but it's not very beautiful, and hopefully there's a better way to do this. Anyhow:

First, some definitions:
a = angle of the unit
u = x of the unit
v = y of the unit
k = x of the destructable
g = y of the destructable
r is the solution aka the distance from the destructable to the line extended perpendicularly from the unit

if a is equal to a multiple of 180, then:

r = Abs(k - u)

if a is equal to 90 plus a multiple of 180, then:

r = Abs(g - v)

if the value of a satisfies neither of those two conditions, a much uglier formula can be used. It will be split up for convenience; I used about 8 inches of paper writing it out fully in small writing otherwise.

t will be a variable defined for the sake of convenience and efficiency. It represents the solved x location of where the line from the destructable intersects the perpendicular line from the unit, and is defined as:

t = ((g - k*tan(a)) - (v - u*tan(a-90)))/(tan(a-90) - tan(a))

r = SquareRoot((k - t)^2 + (k*tan(a) - tan(a)*t)^2)

Granted, there's some compression that could be done (ie storing tan(a) and tan(a-90) to variables). As such, if you were to define h as tan(a) and j as tan(a-90), you would get:

t = ((g - k*h) - (v - u*j))/(j - h)

r = SquareRoot((k - t)^2 + (k*h - h*t)^2)

Which you could further simplify, thus winding up with the result of:

t = (g - k*h - v + u*j)/(j - h)
r = SquareRoot((k - t)^2 + (h*(k-t))^2)

Thus, your final result is:

if a is a multiple of 180 then:

r = Abs(k - u)

elseif a is 90 plus a multiple of 180 then:

r = Abs(g - v)

else

h = tan(a)
j = tan(a - 90)
t = (g - k*h - v + u*j)/(j - h)
r = SquareRoot((k - t)^2 + (h*(k-t))^2)

Note however that a region won't angle with a unit, thus you'll have to use a neato way to only pick destructables behind a unit when enumerating them in an area around the unit. Good luck and ask if you're not sure how to do that!

noob134 · Sep 27, 2009

uberfoop said:
Well, I built a solution, but it's not very beautiful, and hopefully there's a better way to do this. Anyhow:

First, some definitions:
a = angle of the unit
u = x of the unit
v = y of the unit
k = x of the destructable
g = y of the destructable
r is the solution aka the distance from the destructable to the line extended perpendicularly from the unit

if a is equal to a multiple of 180, then:

r = Abs(k - u)

if a is equal to 90 plus a multiple of 180, then:

r = Abs(g - v)

if the value of a satisfies neither of those two conditions, a much uglier formula can be used. It will be split up for convenience; I used about 8 inches of paper writing it out fully in small writing otherwise.

t will be a variable defined for the sake of convenience and efficiency. It represents the solved x location of where the line from the destructable intersects the perpendicular line from the unit, and is defined as:

t = ((g - k*tan(a)) - (v - u*tan(a-90)))/(tan(a-90) - tan(a))

r = SquareRoot((k - t)^2 + (k*tan(a) - tan(a)*t)^2)

Granted, there's some compression that could be done (ie storing tan(a) and tan(a-90) to variables). As such, if you were to define h as tan(a) and j as tan(a-90), you would get:

t = ((g - k*h) - (v - u*j))/(j - h)

r = SquareRoot((k - t)^2 + (k*h - h*t)^2)

Which you could further simplify, thus winding up with the result of:

t = (g - k*h - v + u*j)/(j - h)
r = SquareRoot((k - t)^2 + (h*(k-t))^2)

Thus, your final result is:

if a is a multiple of 180 then:

r = Abs(k - u)

elseif a is 90 plus a multiple of 180 then:

r = Abs(g - v)

else

h = tan(a)
j = tan(a - 90)
t = (g - k*h - v + u*j)/(j - h)
r = SquareRoot((k - t)^2 + (h*(k-t))^2)

Note however that a region won't angle with a unit, thus you'll have to use a neato way to only pick destructables behind a unit when enumerating them in an area around the unit. Good luck and ask if you're not sure how to do that!

the formula you gave me isnt really working but is T supposed to be done scientifically or just from left to right?
Here is trigger for you to check.

Camera
- Events
  - Time - Every 0.03 seconds of game time
- Conditions
- Actions
  - For each (Integer CamInt) from 1 to 12, do (Actions)
    - Loop - Actions
      - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        CameraOn[CamInt] Equal to True
        
        Then - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        Destructible[CamInt] Equal to True
        
        Then - Actions
        
        Set UseofCamD[CamInt] = True
        
        Set TempLoc = (Position of CameraUnit[CamInt])
        
        Set TempLoc2 = (TempLoc offset by (CameraDisNorm[CamInt] x 0.30) towards ((Facing of CameraUnit[CamInt]) - 180.00) degrees)
        
        Set TempRegion = (Region centered at TempLoc2 with size ((CameraDisNorm[CamInt] x 0.41), (CameraDisNorm[CamInt] x 0.41)))
        
        Custom script: call RemoveLocation(udg_TempLoc)
        
        Destructible - Pick every destructible in TempRegion and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Destructible-type of (Picked destructible)) Equal to Camera Blocker
        
        Then - Actions
        
        Set TempLoc = (Position of (Picked destructible))
        
        Set A[CamInt] = (Facing of CameraUnit[CamInt])
        
        Set U[CamInt] = (X of TempLoc)
        
        Set V[CamInt] = (Y of TempLoc)
        
        Set K[CamInt] = (X of TempLoc2)
        
        Set G[CamInt] = (Y of TempLoc2)
        
        Set Equation[CamInt] = True
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (A[CamInt] Equal to 180.00) or (A[CamInt] Equal to 360.00)
        
        Then - Actions
        
        Set R[CamInt] = (Abs((K[CamInt] - U[CamInt])))
        
        Set Equation[CamInt] = False
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        A[CamInt] Equal to 270.00
        
        Then - Actions
        
        Set R[CamInt] = (Abs((G[CamInt] - V[CamInt])))
        
        Set Equation[CamInt] = False
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        Equation[CamInt] Equal to True
        
        Then - Actions
        
        Set H[CamInt] = (Tan(A[CamInt]))
        
        Set J[CamInt] = (Tan((A[CamInt] - 90.00)))
        
        Set T[CamInt] = ((((((G[CamInt] - K[CamInt]) x H[CamInt]) - V[CamInt]) + U[CamInt]) x J[CamInt]) / (J[CamInt] - H[CamInt]))
        
        Set R[CamInt] = (Square root((((K[CamInt] - T[CamInt]) x (K[CamInt] - T[CamInt])) + ((H[CamInt] x (K[CamInt] - T[CamInt])) x (H[CamInt] x (K[CamInt] - T[CamInt]))))))
        
        Set CameraDisDestruc[CamInt] = R[CamInt]
        
        Else - Actions
        
        Else - Actions
        
        Custom script: call RemoveLocation(udg_TempLoc2)
        
        Custom script: call RemoveRect(udg_TempRegion)
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        RotationOn[CamInt] Equal to True
        
        Then - Actions
        
        Camera - Set (Owner of CameraUnit[CamInt])'s camera Rotation to (Facing of CameraUnit[CamInt]) over 0.15 seconds
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        UseofCamD[CamInt] Equal to False
        
        Then - Actions
        
        Camera - Set (Owner of CameraUnit[CamInt])'s camera Distance to target to CameraDisNorm[CamInt] over 0.15 seconds
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        UseofCamD[CamInt] Equal to True
        
        Then - Actions
        
        Camera - Set (Owner of CameraUnit[CamInt])'s camera Distance to target to CameraDisDestruc[CamInt] over 0.15 seconds
        
        Set UseofCamD[CamInt] = False
        
        Else - Actions
        
        Camera - Set (Owner of CameraUnit[CamInt])'s camera Angle of attack to CamAoA[CamInt] over 0.15 seconds
        
        Camera - Set (Owner of CameraUnit[CamInt])'s camera Height Offset to CamHeight[CamInt] over 0.15 seconds
        
        Else - Actions

uberfoop · Sep 27, 2009

temploc and temploc2, in the spots when the formula is being calculated, are wrong. The way you have it, temploc should be the position of the unit, temploc2 should be the position of the destructable.

And yes, t is supposed to be done with recognition of order of operations. Hence why I put the parenthesis there.

0 should also be included in the check for 180 or 360. 90 should also be included in the check for 270.

That should fix it, I think. I know the formula I posted works because I double checked my typing and intensively tested it on my calculator.

edit: you should also be setting the camera distance to the lowest r generated, not simply the final one enumerated.

noob134 · Sep 27, 2009

uberfoop said:
temploc and temploc2, in the spots when the formula is being calculated, are wrong. The way you have it, temploc should be the position of the unit, temploc2 should be the position of the destructable.

And yes, t is supposed to be done with recognition of order of operations. Hence why I put the parenthesis there.

0 should also be included in the check for 180 or 360. 90 should also be included in the check for 270.

That should fix it, I think. I know the formula I posted works because I double checked my typing and intensively tested it on my calculator.

edit: you should also be setting the camera distance to the lowest r generated, not simply the final one enumerated.

here is new and improved trigger, but i dont know how to check for lowest r generated. please help

uberfoop · Sep 28, 2009

At the start of the trigger, set r to the max camera distance. Every iteration, check if the new real is smaller than the current one. If it is, replace the current one with the new.

noob134 · Sep 28, 2009

I finally got it thank you! I would give you +10 rep if i could

[Trigger] Detecting Distance

Attachments

Similar threads