private static bool FaceRaycastBothCullModes(Ray worldRay, ProBuilderMesh mesh, ref SimpleTuple <Face, Vector3> back, ref SimpleTuple <Face, Vector3> front)
{
// Transform ray into model space
worldRay.origin -= mesh.transform.position; // Why doesn't worldToLocalMatrix apply translation?
worldRay.origin = mesh.transform.worldToLocalMatrix * worldRay.origin;
worldRay.direction = mesh.transform.worldToLocalMatrix * worldRay.direction;
IList <Vector3> positions = mesh.positions;
IList <Face> faces = mesh.faces;
back.item1 = null;
front.item1 = null;
float backDistance = Mathf.Infinity;
float frontDistance = Mathf.Infinity;
// Iterate faces, testing for nearest hit to ray origin. Optionally ignores backfaces.
for (int i = 0, fc = faces.Count; i < fc; ++i)
{
ReadOnlyCollection <int> indexes = faces[i].indexes;
for (int j = 0, ic = indexes.Count; j < ic; j += 3)
{
Vector3 a = positions[indexes[j + 0]];
Vector3 b = positions[indexes[j + 1]];
Vector3 c = positions[indexes[j + 2]];
float dist;
Vector3 point;
if (Math.RayIntersectsTriangle(worldRay, a, b, c, out dist, out point))
{
if (dist < backDistance || dist < frontDistance)
{
Vector3 nrm = Vector3.Cross(b - a, c - a);
float dot = Vector3.Dot(worldRay.direction, nrm);
if (dot < 0f)
{
if (dist < backDistance)
{
backDistance = dist;
back.item1 = faces[i];
}
}
else
{
if (dist < frontDistance)
{
frontDistance = dist;
front.item1 = faces[i];
}
}
}
}
}
}
if (back.item1 != null)
{
back.item2 = worldRay.GetPoint(backDistance);
}
if (front.item1 != null)
{
front.item2 = worldRay.GetPoint(frontDistance);
}
return(back.item1 != null || front.item1 != null);
}
static EdgeAndDistance GetNearestEdgeOnMesh(ProBuilderMesh mesh, Vector3 mousePosition)
{
Ray ray = UHandleUtility.GUIPointToWorldRay(mousePosition);
var res = new EdgeAndDistance()
{
edge = Edge.Empty,
distance = Mathf.Infinity
};
SimpleTuple <Face, Vector3> s_DualCullModeRaycastBackFace = new SimpleTuple <Face, Vector3>();
SimpleTuple <Face, Vector3> s_DualCullModeRaycastFrontFace = new SimpleTuple <Face, Vector3>();
// get the nearest hit face and point for both cull mode front and back, then prefer the result that is nearest the camera.
if (PHandleUtility.FaceRaycastBothCullModes(ray, mesh, ref s_DualCullModeRaycastBackFace, ref s_DualCullModeRaycastFrontFace))
{
Vector3[] v = mesh.positionsInternal;
if (s_DualCullModeRaycastBackFace.item1 != null)
{
foreach (var edge in s_DualCullModeRaycastBackFace.item1.edgesInternal)
{
float d = UHandleUtility.DistancePointLine(s_DualCullModeRaycastBackFace.item2, v[edge.a], v[edge.b]);
if (d < res.distance)
{
res.edge = edge;
res.distance = d;
}
}
}
if (s_DualCullModeRaycastFrontFace.item1 != null)
{
var a = mesh.transform.TransformPoint(s_DualCullModeRaycastBackFace.item2);
var b = mesh.transform.TransformPoint(s_DualCullModeRaycastFrontFace.item2);
var c = SceneView.lastActiveSceneView.camera.transform.position;
if (Vector3.Distance(c, b) < Vector3.Distance(c, a))
{
foreach (var edge in s_DualCullModeRaycastFrontFace.item1.edgesInternal)
{
float d = UHandleUtility.DistancePointLine(s_DualCullModeRaycastFrontFace.item2, v[edge.a], v[edge.b]);
if (d < res.distance)
{
res.edge = edge;
res.distance = d;
}
}
}
}
if (res.edge.IsValid())
{
res.distance = UHandleUtility.DistanceToLine(
mesh.transform.TransformPoint(v[res.edge.a]),
mesh.transform.TransformPoint(v[res.edge.b]));
}
}
return(res);
}
private static EdgeAndDistance GetNearestEdgeOnMesh(Camera camera, ProBuilderMesh mesh, Vector3 mousePosition)
{
Ray ray = camera.ScreenPointToRay(mousePosition);
var res = new EdgeAndDistance()
{
edge = Edge.Empty,
distance = Mathf.Infinity
};
SimpleTuple <Face, Vector3> dualCullModeRaycastBackFace = new SimpleTuple <Face, Vector3>();
SimpleTuple <Face, Vector3> dualCullModeRaycastFrontFace = new SimpleTuple <Face, Vector3>();
// get the nearest hit face and point for both cull mode front and back, then prefer the result that is nearest the camera.
if (FaceRaycastBothCullModes(ray, mesh, ref dualCullModeRaycastBackFace, ref dualCullModeRaycastFrontFace))
{
IList <Vector3> v = mesh.positions;
if (dualCullModeRaycastBackFace.item1 != null)
{
foreach (var edge in dualCullModeRaycastBackFace.item1.edges)
{
float d = DistanceToLine(dualCullModeRaycastBackFace.item2, v[edge.a], v[edge.b]);
if (d < res.distance)
{
res.edge = edge;
res.distance = d;
}
}
}
if (dualCullModeRaycastFrontFace.item1 != null)
{
Vector3 a = mesh.transform.TransformPoint(dualCullModeRaycastBackFace.item2);
Vector3 b = mesh.transform.TransformPoint(dualCullModeRaycastFrontFace.item2);
Vector3 c = camera.transform.position;
if (Vector3.Distance(c, b) < Vector3.Distance(c, a))
{
foreach (var edge in dualCullModeRaycastFrontFace.item1.edges)
{
float d = DistanceToLine(dualCullModeRaycastFrontFace.item2, v[edge.a], v[edge.b]);
if (d < res.distance)
{
res.edge = edge;
res.distance = d;
}
}
}
}
if (res.edge.IsValid())
{
res.distance = DistanceToLine(camera, mousePosition,
mesh.transform.TransformPoint(v[res.edge.a]),
mesh.transform.TransformPoint(v[res.edge.b]));
}
}
return(res);
}
