convert float numbers to an angle (solved)

I want to model some realistic looking 3d analogue guages (the type with a needle like a speedometer).

I am pre-empting the challenge of feeding floating numeric data to the guage to have the needle rotate around the guage face and show accurately the numeric data being fed to it. I will also be modeling some moving-tape type guages and I expect the method of driving them will be similar..

Anyone know of any tutorials for this type of scripting? or better still anyone done it recently and willing to share code examples?

 

Using the SuperLerp function from here, let's say you want the speedometer to have a range of 320 degrees, where the resting position is at 200 degrees, and the input is a float representing kilometers per hour where the range is 0 through 240:

Code (csharp):

1. var kph : float;
2.  
3. function Update () {
4.     transform.rotation = Quaternion.Euler(0.0, 0.0,
5.         200.0 + MathS.SuperLerp(0.0, 320.0, 0.0, 240.0, kph));
6. }

That would rotate around the Z axis; might need to change the axis depending on how the gauge is set up.

You could also do

Code (csharp):

1.         MathS.SuperLerp(200.0, 520.0, 0.0, 240.0, kph));

which would be a tiny bit faster although perhaps not quite as clear.

--Eric

 

Thanks Eric that looks like exactly what I need... I havent had any experience of super lerp... so this should be fun!

 

That's because I made it up. It's basically Mathf.Lerp(a, b, Mathf.InverseLerp(c, d, t)), which I found that I used quite a bit, so I made a SuperLerp function that does the same thing, except it's easier to type and runs faster.

--Eric