Realistic Wind

Hello!

Im making a simple paragliding game, but im kind of stuck.
I want to add wind, witch works fine exept the wind can pass trough my terrain..
Normaly the wind would be deflected off of the hills upward giving the paraglider lift but i have no clue how to get this type of behaviour.

Here is a picture of what i mean


I have no clue how to do this please help!
Any kind of help is appreciated!

 

Simply raycast down whenever you need to know the height and angle of anything you want. Let us know if more is needed from that.

 

Hi, thanks for your reply but im looking for a way to make the wind behave as described not the glider.

 

The "wind" is a force, you *have* to do this.

When modelling forces like wind it's a force acting on a rigidbody, wind does not exist in Unity as you would expect it. So the applied force thats "wind" needs to factor in 2 things:

1. elevation of ground below
2. the angle of the ground below

Then you orient the "wind" force based on ground slope, and change it's strength based on the elevation, 2 things which are covered by RaycastHit which returns the position and the normal of the surface it hit.

Once you have the normal, you can quickly use it to determine what the angle is.

To rotate the wind vector is then a trivial operation, but that's how things happen in physics in games or simulations. There's no actual "wind" feature in Unity that will do what you ask, so you will need to do your own via forces.

 

Hey radkosuper,

Nice challenge you have there! I guess you’d like to model a terrain, set a general wind direction and let an algorithm take care of the rest?

I’d go about this like this:
Offline:
- Create a greyscale Image of your terrain. - Apply a low pass filter (blur) to said image so smooth out small artifacts in your landscape.
- Create a normal map from the grayscale image

Ingame:
- Sample the normal at the Position your paraglider is located.
- go on like hippocoder described

Another idea is to explicitly create wind field volumes. I’d create a box with a trigger collider in the area where you’d like to have the base wind direction changed and superpose a wind vector on the base wind.

How to actually implement that in your plane model, I don’t know.

Let us know if it works!