I am writing a 3D shader and I got this graph and I just can't figure out the function
The result value (given in greyscale values between 0=black and 1=white) depends on the two variables a and b.
It is for example,
0.5 when a=b
1 when a=1
0 when b=1
0.5+(a/2) when b=0
0.5+(b/2) when a=0
(is there a name for this kind of graph btw.?)
I think it must be a quite simple function.
Thanks in advanced for help
Calculate the slope (or angle) from any point to (1,1) and base it on that.
Example: (0.2,0.2) ==> Slope = (1-0.2)/(1-0.2) = 1 = 45°
Example: (0.9,0.2) ==> Slope = (1-0.2)/(1-0.9) = 8 = 83°
So you could say the first point was 45°/90° = 0.5, and the second 83°/90° = 0.92
That should get you close.