| public RaycastOne ( Segment segment, float &lambda, Vec2 &normal, bool solidShapes, object userData ) : Shape | ||
| segment | Segment | Defines the begin and end point of the ray cast, from p1 to p2. /// Use Segment.Extend to create (semi-)infinite rays. |
| lambda | float | Returns the hit fraction. You can use this to compute the contact point /// p = (1 - lambda) * segment.p1 + lambda * segment.p2. |
| normal | Vec2 | Returns the normal at the contact point. If there is no intersection, the normal is not set. |
| solidShapes | bool | Determines if shapes that the ray starts in are counted as hits. |
| userData | object | |
| return | Shape | |
public Shape RaycastOne(Segment segment, out float lambda, out Vec2 normal, bool solidShapes, object userData)
{
lambda = 0;
normal = new Vec2(0, 0);
int maxCount = 1;
Shape[] shape = new Shape[maxCount];
int count = Raycast(segment, shape, maxCount, solidShapes, userData);
if (count == 0)
return null;
Box2DXDebug.Assert(count == 1);
//Redundantly do TestSegment a second time, as the previous one's results are inaccessible
XForm xf = shape[0].GetBody().GetXForm();
shape[0].TestSegment(xf, out lambda, out normal, segment, 1);
//We already know it returns true
return shape[0];
}