How to Make A Ramp. When moving up it slows the player. Down it speeds up player

[Maverick Wolf]

Hello,

Would anyone know how to make a ramp that, when you are moving up it. Slows down the players walk speed. And when going down the ramp, speeds up the players walk speed.

If possible, can the speed of the player be adjusted based upon what angle the ramp is? As a minor slope (5degrees) would only effect 10% of the walk speed. And a major slope (35degrees) would effect the walk speed by 80%.

Thanks

[Denny]

There are many ways to handle this. One way would be to keep track of the player velocity, then use the dot product to compare with a stationary vector like up or forward. If the character is grounded, we can then use the dot product to "multiply" how much the player speed is affected. Another way is to make sloped assets use a volume to determine speeds.

[Ray Jones 312]

You could do a line trace from the feet of your player character and use the impact normal returned from the hit information as a scalar to your movement speed.

[Maverick Wolf]

I unfortunately think the volume way would be least effective because of the need to speed up while going down, and slow down while going up.

I also forgot that this should be done in blueprints (Which I think you all assumed anyways). Is there someone with a screenshot of how it should be done? Right now it's really hard for me to visualize what you are all saying and how it would be able to recognize when it is moving up and moving down the ramp.

[PenguinTD]

It's easy really, no trace required, if your movement gets updated with a given period, by move event or tick.
Save your position as oldPosition, compare your currentPosition to it, if you are going up in Z, then you are moving up slope, if you are going down in Z, then you move down slope.
Since you would also have delta since last update, you can tell by how much you climb up or down.

It is possible if people can just tap control really quickly(or with a macro) uphill to avoid this type of check to slow down.(what makes ski possible in Tribe1 with macro key binding).
But the idea is roughly the same, you can even have a "speed up" time before you go on full speed to avoid this type of problem.

[Maverick Wolf]

Excellent! This sounds about right. I'll try it out later tonight. Thanks Penguin!

[DomusLudus]

cannot you get the slope value from the character? is not open to BP?

[Denny]

I unfortunately think the volume way would be least effective because of the need to speed up while going down, and slow down while going up.

The volume can be used to set different "slope rules", together with the velocity calculations. Maybe it's slippery there. I guess it was an unfinished thought when I mentioned it.

[Ray Jones 312]

cannot you get the slope value from the character? is not open to BP?

There are certainly ways to get it. Using a downward trace, you can get the slope of the surface you are on from the impact normal, like I mentioned earlier.