/**
* Find the nearest triangle intersected by InWorldRay on this pb_Object. InWorldRay is in world space.
* @hit contains information about the hit point. @distance limits how far from @InWorldRay.origin the hit
* point may be. @cullingMode determines what face orientations are tested (Culling.Front only tests front
* faces, Culling.Back only tests back faces, and Culling.FrontBack tests both).
*/
public static bool MeshRaycast(Ray InWorldRay, pb_Object pb, out pb_RaycastHit hit, float distance, Culling cullingMode)
{
/**
* Transform ray into model space
*/
InWorldRay.origin -= pb.transform.position; // Why doesn't worldToLocalMatrix apply translation?
InWorldRay.origin = pb.transform.worldToLocalMatrix * InWorldRay.origin;
InWorldRay.direction = pb.transform.worldToLocalMatrix * InWorldRay.direction;
Vector3[] vertices = pb.vertices;
float dist = 0f;
Vector3 point = Vector3.zero;
float OutHitPoint = Mathf.Infinity;
float dot; // vars used in loop
Vector3 nrm; // vars used in loop
int OutHitFace = -1;
Vector3 OutNrm = Vector3.zero;
/**
* Iterate faces, testing for nearest hit to ray origin. Optionally ignores backfaces.
*/
for (int CurFace = 0; CurFace < pb.faces.Length; ++CurFace)
{
int[] Indices = pb.faces[CurFace].indices;
for (int CurTriangle = 0; CurTriangle < Indices.Length; CurTriangle += 3)
{
Vector3 a = vertices[Indices[CurTriangle + 0]];
Vector3 b = vertices[Indices[CurTriangle + 1]];
Vector3 c = vertices[Indices[CurTriangle + 2]];
nrm = Vector3.Cross(b - a, c - a);
dot = Vector3.Dot(InWorldRay.direction, nrm);
bool ignore = false;
switch (cullingMode)
{
case Culling.Front:
if (dot > 0f)
{
ignore = true;
}
break;
case Culling.Back:
if (dot < 0f)
{
ignore = true;
}
break;
}
if (!ignore && pb_Math.RayIntersectsTriangle(InWorldRay, a, b, c, out dist, out point))
{
if (dist > OutHitPoint || dist > distance)
{
continue;
}
OutNrm = nrm;
OutHitFace = CurFace;
OutHitPoint = dist;
continue;
}
}
}
hit = new pb_RaycastHit(OutHitPoint,
InWorldRay.GetPoint(OutHitPoint),
OutNrm,
OutHitFace);
return(OutHitFace > -1);
}
/**
* Find a triangle intersected by InRay on InMesh. InRay is in world space.
*/
public static bool MeshRaycast(Ray InWorldRay, pb_Object pb, out pb_RaycastHit hit)
{
return(MeshRaycast(InWorldRay, pb, out hit, Mathf.Infinity, Culling.Front));
}
