Get terrain slope.

[smashthewindow]

Is there some engine function to get the slope of the current environment that a controller in on?

I'm guessing that this is possible due to the fact that the controller take's a parameter that set's maximun climb angle of the controller at it's constructor.

If not, I'm thinking raycasting to solve my problem, but I'm just making sure before I go do something stupid.

[Canardia]

GetTerrainNormal() returns a vector which a terrain triangle is facing, so the slope is orthogonal to that. There's probably some Linear Algebra formula to calculate the orthogonal to a Vec3, perhaps like this:

TVec3 GetOrthogonal( const TVec3& v )  // Return a non-zero vector orthogonal to A.
{
   if( 0 == v.X ) return Vec3( 1, 0, 0 );
   return Vec3( v.Y, -v.X, 0 );
}

[Josh]

From terrain.frag:

float slope = asin( worldNormal.y );
slope = 90.0 - slope * 57.2957795;

You may have to fiddle around with it a little for rads/degrees.

[smashthewindow]

Thanks all for the reply.