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[r0ber7]

Consider this.

I've based this on this article, which I only understand somewhat.
http://www.wildbunny.co.uk/blog/2011/04/06/physics-engines-for-dummies/



To check collision between two spheres, I calculate the distance between the two centers of those spheres. If that distance is smaller than the sum of the radiuses plus the velocity of the objects (r + r + xs), collision = true.

My question is about collision with the ground. I have an array with x&y locations for the ground. I know the position of a, I know the position of b, I know the length of r, I know the velocity of the object along the vector, so I know point c too.

How do I check if b,c intersects with d,e? I've read about the dot product, but I don't really understand how I would implement that. I'm fairly new to vectors, and I hope someone here can help me.

Cheers.

[BleakProspects]

Line sphere intersection:

http://en.wikipedia.org/wiki/Line%E2%80%93sphere_intersection

You can also compute the closest point along the line to the sphere's center and see if its distance is less than the sphere's radius:

http://stackoverflow.com/questions/3120357/get-closest-point-to-a-line

[r0ber7]

Line sphere intersection:

http://en.wikipedia.org/wiki/Line%E2%80%93sphere_intersection

You can also compute the closest point along the line to the sphere's center and see if its distance is less than the sphere's radius:

http://stackoverflow.com/questions/3120357/get-closest-point-to-a-line

Thanks, it's working. You just made my day.

[Evan Balster]

How do I check if b,c intersects with d,e?

Be advised that this is not always true when the circle collides with the line.