Translating multiple objects in GUI based on average position?
- by user1423893
I use this method to move a single object in 3D space, it accounts for a local offset based on where the cursor ray hits the widget and the center of the widget.
var cursorRay = cursor.Ray;
Vector3 goalPosition = translationWidget.GoalPosition;
Vector3 position = cursorRay.Origin + cursorRay.Direction * grabDistance;
// Constrain object movement based on selected axis
switch (translationWidget.AxisSelected)
{
case AxisSelected.All: goalPosition = position; break;
case AxisSelected.None: break;
case AxisSelected.X: goalPosition.X = position.X; break;
case AxisSelected.Y: goalPosition.Y = position.Y; break;
case AxisSelected.Z: goalPosition.Z = position.Z; break;
}
translationWidget.GoalPosition = goalPosition;
Vector3 p = goalPosition - translationWidget.LocalOffset;
objectSelected.Position = p;
I would like to move multiple objects based on the same principle and using a widget which is located at the average position of all the objects currently selected.
I thought that I would have to translate each object based on their offset from the average point and then include the local offset.
var cursorRay = cursor.Ray;
Vector3 goalPosition = translationWidget.GoalPosition;
Vector3 position = cursorRay.Origin + cursorRay.Direction * grabDistance;
// Constrain object movement based on selected axis
switch (translationWidget.AxisSelected)
{
case AxisSelected.All: goalPosition = position; break;
case AxisSelected.None: break;
case AxisSelected.X: goalPosition.X = position.X; break;
case AxisSelected.Y: goalPosition.Y = position.Y; break;
case AxisSelected.Z: goalPosition.Z = position.Z; break;
}
translationWidget.GoalPosition = goalPosition;
Vector3 p = goalPosition - translationWidget.LocalOffset;
int numSelectedObjects = objectSelectedList.Count;
for (int i = 0; i < numSelectedObjects; ++i)
{
objectSelectedList[i].Position =
(objectSelectedList[i].Position - translationWidget.Position) + p;
}
This doesn't work as the object starts shaking, which I think is because I haven't accounted for the new offset correctly. Where have I gone wrong?
