/// <summary>
/// Cast a ray (in model space) against a mesh.
/// </summary>
/// <param name="InRay"></param>
/// <param name="vertices"></param>
/// <param name="triangles"></param>
/// <param name="hit"></param>
/// <param name="distance"></param>
/// <param name="cullingMode"></param>
/// <returns></returns>
internal static bool MeshRaycast(Ray InRay, Vector3[] vertices, int[] triangles, out PolyRaycastHit hit, float distance = Mathf.Infinity, Culling cullingMode = Culling.Front)
{
Vector3 hitNormal = Vector3.zero; // vars used in loop
Vector3 vert0, vert1, vert2;
Vector3 origin = InRay.origin, direction = InRay.direction;
hit = new PolyRaycastHit(Mathf.Infinity,
Vector3.zero,
Vector3.zero,
-1);
/**
* Iterate faces, testing for nearest hit to ray origin.
*/
for (int CurTri = 0; CurTri < triangles.Length; CurTri += 3)
{
if (CurTri + 2 >= triangles.Length)
{
continue;
}
if (triangles[CurTri + 2] >= vertices.Length)
{
continue;
}
vert0 = vertices[triangles[CurTri + 0]];
vert1 = vertices[triangles[CurTri + 1]];
vert2 = vertices[triangles[CurTri + 2]];
// Second pass, test intersection with triangle
if (Math.RayIntersectsTriangle2(origin, direction, vert0, vert1, vert2, ref distance, ref hitNormal))
{
if (distance < hit.distance)
{
hit.distance = distance;
hit.triangle = CurTri / 3;
hit.position = InRay.GetPoint(hit.distance);
hit.normal = hitNormal;
}
}
}
hit = new PolyRaycastHit(hit.distance,
InRay.GetPoint(hit.distance),
hitNormal,
hit.triangle);
return(hit.triangle > -1);
}