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a thread on Inverse Lerp - a super useful, yet often overlooked function!
Lerp( a, b, t ) = value
InvLerp( a, b, value ) = t
• lerp returns a blend between a and b, based on a fraction t
• inverse lerp returns a fraction t, based on a value between a and b
#unitytipspic.twitter.com/P0s4MHCqSO
use case! 
say you want to control audio source volume based on distance
• at 10 meters, you want volume 1
• at 20 meters, you want volume 0
then the volume is then given by
volume = InvLerp( 20, 10, distance )pic.twitter.com/NkIy47VwBg
if you've ever used photoshop's levels tool, then you've used both lerp and inverse lerp! 
the input values use inverse lerp, the output values use lerp!pic.twitter.com/0ehIOXAzqS
when used with images, inverse lerp can be used to increase value contrast! for example, here's a selfie before and after an inverse lerp
pic.twitter.com/TsX9N1eigx
also, note that some Lerp/InvLerp functions also extrapolate (such as in shaders), while others clamp the values within your given range (such as Unity's Mathf.Lerp/InverseLerp functions)
make sure you clamp unless you want to extrapolate 
here's an interesting use case!
an inv lerp where a and b are colors and the value parameter is the depth of this water, you can achieve hue-shifting for a color elimination effect by depth
anyhow, that's all! hope you found this useful~pic.twitter.com/b5MVQvMTOm
I'm also going live now for a few hours, working on the level editor for Flowstorm 
come hang out~http://twitch.tv/acegikmo
addendum - another useful function is Remap! remap takes a value within a given input range into a given output range, which is basically a combined inverse lerp and lerp! here's the code for all three! (also, none of these are clamped - they can all extrapolate)pic.twitter.com/I7tzgsctlb
another thread, if you want to learn more about lerp!https://twitter.com/FreyaHolmer/status/1175925033002254338?s=19 …
Lerp is used to blend between two things!
It has three inputs: ( a, b, t )
a = start value
b = end value
t = how far we should go from start to end, as a percentage
Here it is in action!
blending a value, position, color and an angle! pic.twitter.com/LdA69fLI8NA Prel. :)
Neat, that's new to me. Thanks for sharing.
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