Maxscript: This function demonstrates how to control a blend between a 'linear curve' - 'round curve' - 'inverted round curve'. This is useful when creating a fillet on an object.

Smooth Curve Expression | .ms

numSteps = 20
height = 15.0 --radius
width = 30.0 --radius
smoothness = .5

delete objects

for i = 0 to numSteps do
(
	ang = (180.0 / numSteps) * i
	
	/* Circular Calculations */
	xCircular = -1 * width/2.0 * cos(ang) --multiplied by -1 to flip horizontal
	yCircular = height * sin(ang)
	
	/* Linear Calculations */
	xLinear = 1.0 * i / numSteps * width
	yLinear = (asin(sin(ang))/90) * height
		
	posL = [xLinear,yLinear,0]
	posC = [xCircular,yCircular,0] + [width/2.0,0,0]
	point pos:posC size:1 cross:true box:false wirecolor:green
	point pos:posL size:1 cross:true box:false wirecolor:red
		
	/* Blend Calculations */
	posB = ((posC - posL)*smoothness) + posL
	point pos:posB size:1 cross:true box:true wirecolor:yellow	
)