NewtonWorldConvexCast getting FaceAttribute

[derdragon]

Is there a way for me to find out the attribute of the face hit by a NewtonWorldConvexCast? I'd like to determine what part of my tree collision my character controller is standing on and this data is stored in the face attribute data. NewtonWorldConvexCastReturnInfo contains the body hit by the cast, but when I have many different things making up a tree collision, I need more specific results.

[Julio Jerez]

In the structure

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struct NewtonWorldConvexCastReturnInfo
   {
      dFloat m_point[4];                  // collision point in global space
      dFloat m_normal[4];                  // surface normal at collision point in global space
      dFloat m_normalOnHitPoint[4];           // surface normal at the surface of the hit body,
                                    // is the same as the normal calculated by a ray cast hitting the body at the hit point
      dFloat m_penetration;                   // contact penetration at collision point
      int    m_contactID;                       // collision ID at contact point
      const  NewtonBody* m_hitBody;         // body hit at contact point
   };

contactID is the id of the shape at the conatct point.
for a collision tree it will be the ID of the face, in a compound it will be the ID of the subshape, in a hightfirldit will be the id of the cell, and so on.

[derdragon]

Are you sure? All I get is 0, when I've definitely passed integers for the face attributes in NewtonTreeCollisionAddFace:

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NewtonTreeCollisionAddFace(col,3,&verts[0],12,(int)D);

Also, the face attribute is correct in my collisions checks, so I'm thinking either it's an issue with the convex cast, or I'm not using it right. Thank you again for another quick response!

[Julio Jerez]

Not I am not sure, but it is how it is supposes to work.
if it is not then it is a bug in teh engine and it nee to be resolved.
I never check that because convex cast is based on the same collision functions the collision system is based upon. But there could be a bug.