Vector sliding/bouncing

Hi there,

I have the following code to bounce an object:

'Vx/y= Velocity (incoming object)
'normalx/y = surface-normal
'linex/y   = line vector

dotprod=Vx*normalx+Vy*normaly
resx=-2*dotprod*normalx + Vx
resy=-2*dotprod*normaly + Vy
Vx= resx * (1-Damping)
Vy= resy * (1-Damping)

While bouncing works well, I'm stucked getting sliding working. How do I need to fit the line vector into this to get the sliding velocity? Best of all would be to have a modifier bounce# to define the amount of bounce/slide (e.g. bounce=0 means full sliding, bounce=0.5 means the angle halfway between full bounce and slide).

I'm aware of the existing threads about this topic, but I can't produce a working solution out of them, so maybe someone can push me in the right direction.

Thanks
Jake

to implement sliding, you have to make the "sliding percentage" affect the "reflection" vector, in your equation this means -2*dotprod*normalx, -2*dotprod*normaly need to be modified (*multiplied by 1 or a sum of 2 values, think 2 due to x,y) in such a way that adding them to Vx and Vy makes resx, resy = linex / y

Write out all those equations and solve them by simply using the general rules to solve linear equation systems. Nothing large nor complex.
Just handwork basically

I learned a lot from this article when I was starting out with physics:

http://www.gaffer.org/game-physics/integration-basics

it's in c++ but easy to convert to bmx

Thanks, I got it.