Collision Mission! (Part 1: Hill Detection)

[reuben2011]

Originally Posted by David B

I don't see why collision detection is so exciting. It is very easy to do.

Have you viewed the program? If you look at my code, you will see that this program is more complicated than regular collision detection. I had to use a deviation of both the circle formula ((x-h)^2 + (y-k)^2 = r^2) and the Pythagorean theorem (a^2 + b^2 = c^2) in order to move a object smoothly over a spherically shaped object.

[arty-fishL]

why couldn't you just use

y = a COS( b x )

where
a is the height (or amplitude) of the hill
b is the width (or period) of the hill
x is the distance to the centre of the base of the hill

and y is the resulting height of the colliding object relative to the hill

EDIT - that would be for the hill object in the object gallery, for a different shape of hill you could calculate it like a basic parabola.

[reuben2011]

Originally Posted by arty-fishL

why couldn't you just use

y = a COS( b x )

where
a is the height (or amplitude) of the hill
b is the width (or period) of the hill
x is the distance to the centre of the base of the hill

and y is the resulting height of the colliding object relative to the hill

EDIT - that would be for the hill object in the object gallery, for a different shape of hill you could calculate it like a basic parabola.

Well, the curvature of the hill doesn't exactly fit a cosine curve I believe. Would you like to edit my example and post your own. Maybe then I can understand. Also, Alice doesn't have an built-in function for calculating the "x" in your equation.