Math question

[FlinkGigitty]

I have a waterfall in my game, and I want the waterfall to have the sound higher when you are closer and lower when you go away. Heres the thing.

The main object that controls the waterfall sound is a small active object that is placed in the middle of the waterfall, with 200 pixels of waterfall to each side. It has only one action so far:

Always: Set Alterable Value A to ABS(X("Player")-X("WFsound")

So Im basing the sound on this. I know that the sound volume can only go from 0-100, so I have the idea of making this all in percent. The max length of the player to hear the sound will start at 650 pixels away, and the max length will start when he is at the edge of the waterfall, which basically is 200 pixels away. Does anyone have any suggestion on how to set this as an event in the Always: Set sample volume... ?

Lowest volume at 0 when Alterable Value A is 650.
Highest volume at 100 when Alterable Value A is 200 or lower.

[LB]

You should use the distance formula instead.
As for the formula, think of it as a proportion that you need to solve for x: (along with a few min() and max() operations)
200*******x
----**=**----
650*****100
(hopefully I got this math right, it's really early in the morning for me)

The min() and max() would be for not allowing overflow in the calculations of the volume.

[Jax]

Volume = Max( 0 , Min( 100 , -( Distance -650)/4.5 ) )

[FlinkGigitty]

Its probably obvious for you guys how to do this, but I have never used Max, Min or Distance in my projects.

Volume = Max( 0 , Min( 100 , -( Distance -650)/4.5 ) )
Should this go as an Always event? Or are we still talking about Alterable Value A? Anyhow, I cant see any relations to the active WFSound object, which kinda is the base for the distance.. :S

[Jax]

Yeah, 'always' event where you are setting the volume to

Max( 0 , Min( 100 , -( Alterable Value A -650)/4.5 ) )

[LB]

"Distance" is what jax intended you to replace by your distance formula. Min() returns the lowest of two numbers, and Max() returns the highest of two numbers.

Min(1, 3) = 1
Max(1, 3) = 3

Min(5, -6) = -6
Max(5, -6) = 5

[FlinkGigitty]

Ah yea Im getting the picture

But it appears to be a problem when I try to enter the minus before (Alterable Value A).. It then makes a syntax error. Its valid if I remove it. Do I do something wrong?

[Phi]

try using *-1... or change the signs of the bracket's contents.

[FlinkGigitty]

I think Ill just remove this whole thing. Turns out the "fancy" watersplash I made probably decreased the framerate a bit.

Changing the signs would probably work.. I should have though of that by myself actually :P

Thanks a lot to all :]