static Vector3?GetPointAtPosition(Vector2 mousePosition, Rect dragArea)
{
UnitySceneExtensions.Grid.HoverGrid = null;
if (s_CurrentPointIndex == 0)
{
s_StartIntersection = ChiselClickSelectionManager.GetPlaneIntersection(mousePosition, dragArea);
if (s_StartIntersection != null)
{
// TODO: try to cache this ..
var activeGridUp = UnitySceneExtensions.Grid.ActiveGrid.Up;
var activeGridForward = UnitySceneExtensions.Grid.ActiveGrid.Forward;
var activeGridCenter = UnitySceneExtensions.Grid.ActiveGrid.Center;
var surfaceGridPlane = s_StartIntersection.plane;
var surfaceGridUp = surfaceGridPlane.normal;
var surfaceGridForward = MathExtensions.CalculateTangent(surfaceGridUp); // Q: why if this is not negated, we end up-side-down?
var activeGridFromWorldRotation = Quaternion.LookRotation(activeGridForward, activeGridUp);
var worldFromActiveGridRotation = Quaternion.Inverse(activeGridFromWorldRotation);
var surfaceGridFromWorldRotation = Quaternion.LookRotation(surfaceGridForward, surfaceGridUp);
var activeGridToSurfaceGridRotation = surfaceGridFromWorldRotation * worldFromActiveGridRotation;
// Make sure the center of the new grid is as close to the active grid center as possible
Vector3 surfaceGridCenter = activeGridCenter;
var forwardRay = new Ray(activeGridCenter, worldFromActiveGridRotation * Vector3.up);
var backRay = new Ray(activeGridCenter, worldFromActiveGridRotation * Vector3.down);
var leftRay = new Ray(activeGridCenter, worldFromActiveGridRotation * Vector3.left);
var rightRay = new Ray(activeGridCenter, worldFromActiveGridRotation * Vector3.right);
var upRay = new Ray(activeGridCenter, worldFromActiveGridRotation * Vector3.forward);
var downRay = new Ray(activeGridCenter, worldFromActiveGridRotation * Vector3.back);
var bestDist = float.PositiveInfinity;
float dist;
if (surfaceGridPlane.UnsignedRaycast(forwardRay, out dist))
{
var abs_dist = Mathf.Abs(dist); if (abs_dist < bestDist)
{
bestDist = abs_dist; surfaceGridCenter = forwardRay.GetPoint(dist);
}
}
if (surfaceGridPlane.UnsignedRaycast(backRay, out dist))
{
var abs_dist = Mathf.Abs(dist); if (abs_dist < bestDist)
{
bestDist = abs_dist; surfaceGridCenter = backRay.GetPoint(dist);
}
}
if (surfaceGridPlane.UnsignedRaycast(leftRay, out dist))
{
var abs_dist = Mathf.Abs(dist); if (abs_dist < bestDist)
{
bestDist = abs_dist; surfaceGridCenter = leftRay.GetPoint(dist);
}
}
if (surfaceGridPlane.UnsignedRaycast(rightRay, out dist))
{
var abs_dist = Mathf.Abs(dist); if (abs_dist < bestDist)
{
bestDist = abs_dist; surfaceGridCenter = rightRay.GetPoint(dist);
}
}
if (bestDist > 100000) // prefer rays on the active-grid, only go up/down from the active-grid when we have no other choice
{
if (surfaceGridPlane.UnsignedRaycast(upRay, out dist))
{
var abs_dist = Mathf.Abs(dist); if (abs_dist < bestDist)
{
bestDist = abs_dist; surfaceGridCenter = upRay.GetPoint(dist);
}
}
if (surfaceGridPlane.UnsignedRaycast(downRay, out dist))
{
var abs_dist = Mathf.Abs(dist); if (abs_dist < bestDist)
{
bestDist = abs_dist; surfaceGridCenter = downRay.GetPoint(dist);
}
}
}
// TODO: try to snap the new surface grid point in other directions on the active-grid? (do we need to?)
s_Transform = Matrix4x4.TRS(surfaceGridCenter - activeGridCenter, activeGridToSurfaceGridRotation, Vector3.one) *
UnitySceneExtensions.Grid.ActiveGrid.GridToWorldSpace;
s_InvTransform = s_Transform.inverse;
s_Snapping2D.Initialize(new UnitySceneExtensions.Grid(s_Transform), mousePosition, s_StartIntersection.point, UnityEditor.Handles.matrix);
}
}
if (s_StartIntersection != null)
{
if (s_Snapping2D.DragTo(mousePosition, SnappingMode.Always))
{
UnitySceneExtensions.Grid.HoverGrid = s_Snapping2D.WorldSlideGrid;
return(s_Snapping2D.WorldSnappedPosition);
}
}
return(null);
}