private void SelectAxis()
{
// Get mouse ray
Ray ray = Owner.MouseRay;
// Transform ray into local space of the gizmo
Ray localRay;
Matrix invGizmoWorld;
Matrix.Invert(ref _gizmoWorld, out invGizmoWorld);
Vector3.TransformNormal(ref ray.Direction, ref invGizmoWorld, out localRay.Direction);
Vector3.Transform(ref ray.Position, ref invGizmoWorld, out localRay.Position);
// Find gizmo collisions with mouse
float closestintersection = float.MaxValue;
float intersection;
_activeAxis = Axis.None;
switch (_activeMode)
{
case Mode.Translate:
{
// Axis boxes collision
if (XAxisBox.Intersects(ref localRay, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.X;
closestintersection = intersection;
}
if (YAxisBox.Intersects(ref localRay, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.Y;
closestintersection = intersection;
}
if (ZAxisBox.Intersects(ref localRay, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.Z;
closestintersection = intersection;
}
// Quad planes collision
if (closestintersection >= float.MaxValue)
{
closestintersection = float.MinValue;
}
if (XYBox.Intersects(ref localRay, out intersection) && intersection > closestintersection)
{
_activeAxis = Axis.XY;
closestintersection = intersection;
}
if (XZBox.Intersects(ref localRay, out intersection) && intersection > closestintersection)
{
_activeAxis = Axis.ZX;
closestintersection = intersection;
}
if (YZBox.Intersects(ref localRay, out intersection) && intersection > closestintersection)
{
_activeAxis = Axis.YZ;
closestintersection = intersection;
}
break;
}
case Mode.Rotate:
{
// Circles
if (IntersectsRotateCircle(Vector3.UnitX, ref localRay, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.X;
closestintersection = intersection;
}
if (IntersectsRotateCircle(Vector3.UnitY, ref localRay, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.Y;
closestintersection = intersection;
}
if (IntersectsRotateCircle(Vector3.UnitZ, ref localRay, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.Z;
closestintersection = intersection;
}
// Center
/*if (CenterSphere.Intersects(ref ray, out intersection) && intersection < closestintersection)
* {
* _activeAxis = Axis.Center;
* closestintersection = intersection;
* }*/
break;
}
case Mode.Scale:
{
// Spheres collision
if (ScaleXSphere.Intersects(ref ray, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.X;
closestintersection = intersection;
}
if (ScaleYSphere.Intersects(ref ray, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.Y;
closestintersection = intersection;
}
if (ScaleZSphere.Intersects(ref ray, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.Z;
closestintersection = intersection;
}
// Center
if (CenterBox.Intersects(ref ray, out intersection) && intersection < closestintersection)
{
_activeAxis = Axis.Center;
closestintersection = intersection;
}
break;
}
}
}
/// <summary>
/// Per-frame check to see if mouse is hovering over any axis.
/// </summary>
private void SelectAxis(Vector2 mousePosition)
{
if (!Enabled)
{
return;
}
float closestintersection = float.MaxValue;
Ray ray = ConvertMouseToRay(mousePosition);
if (ActiveMode == GizmoMode.Translate)
{
// transform ray into local-space of the boundingboxes.
ray.Direction = Vector3.TransformNormal(ray.Direction, Matrix.Invert(_gizmoWorld));
ray.Position = Vector3.Transform(ray.Position, Matrix.Invert(_gizmoWorld));
}
#region X,Y,Z Boxes
float?intersection = XAxisBox.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value < closestintersection)
{
ActiveAxis = GizmoAxis.X;
closestintersection = intersection.Value;
}
}
intersection = YAxisBox.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value < closestintersection)
{
ActiveAxis = GizmoAxis.Y;
closestintersection = intersection.Value;
}
}
intersection = ZAxisBox.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value < closestintersection)
{
ActiveAxis = GizmoAxis.Z;
closestintersection = intersection.Value;
}
}
#endregion
if (ActiveMode == GizmoMode.Rotate || ActiveMode == GizmoMode.UniformScale || ActiveMode == GizmoMode.NonUniformScale)
{
#region BoundingSpheres
intersection = XSphere.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value < closestintersection)
{
ActiveAxis = GizmoAxis.X;
closestintersection = intersection.Value;
}
}
intersection = YSphere.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value < closestintersection)
{
ActiveAxis = GizmoAxis.Y;
closestintersection = intersection.Value;
}
}
intersection = ZSphere.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value < closestintersection)
{
ActiveAxis = GizmoAxis.Z;
closestintersection = intersection.Value;
}
}
#endregion
}
if (ActiveMode == GizmoMode.Translate || ActiveMode == GizmoMode.NonUniformScale || ActiveMode == GizmoMode.UniformScale)
{
// if no axis was hit (x,y,z) set value to lowest possible to select the 'farthest' intersection for the XY,XZ,YZ boxes.
// This is done so you may still select multi-axis if you're looking at the gizmo from behind!
if (closestintersection >= float.MaxValue)
{
closestintersection = float.MinValue;
}
#region BoundingBoxes
intersection = XYBox.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value > closestintersection)
{
ActiveAxis = GizmoAxis.XY;
closestintersection = intersection.Value;
}
}
intersection = XZAxisBox.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value > closestintersection)
{
ActiveAxis = GizmoAxis.ZX;
closestintersection = intersection.Value;
}
}
intersection = YZBox.Intersects(ray);
if (intersection.HasValue)
{
if (intersection.Value > closestintersection)
{
ActiveAxis = GizmoAxis.YZ;
closestintersection = intersection.Value;
}
}
#endregion
}
if (closestintersection >= float.MaxValue || closestintersection <= float.MinValue)
{
ActiveAxis = GizmoAxis.None;
}
}