The Corona Power Tools, introduced in Corona 11, offer a set of different instruments to simplify the manipulation of objects, which in previous versions had to be done manually or with the help of third-party plugins.
Those tools are:
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Object Replacer – Swaps out currently selected objects in the viewport with objects added to the "Replacing Objects" list.
Pivot Placer – Simplifies object pivot placement by aligning it to the object bounding box or a specific point.
Transform Randomizer – Randomizes transformations of selected objects by adjusting their translation, scale, and rotation along the specified axes within the defined variation ranges.
Scene Cleaner – Allows to quickly clean-up a scene.
Selection Randomizer – Allows to pick an exact number of items from the selection, based on the selection count or a designated percentage value.
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Right-click on the Main 3ds Max Toolbar > Corona Power Tools Toolbar Image Removed
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Object Replacer
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Add – Adds objects currently selected in the scene to the "Replacing Objects" list.
Remove – Removes selected entries from the "Replacing Objects" list.
Clear All – Removes all entries from the "Replacing Objects" list.
Seed – Changes the replacement randomization.
Cloning Type – Allows you to select one out of three available cloning types: copy, instance or reference.
Advanced – Shows additional replacement settings.
Layer From Object(s) – Specifies whether the resulting objects should be placed on the Replacing or Replaced objects' layers. Material From Object(s) – Specifies whether the resulting objects should be using the Replacing or Replaced objects' materials. Rotation From Object(s) – Specifies whether the resulting objects should be rotated based on the Replacing or Replaced objects' rotation. Scale From Object(s) – Specifies whether the resulting objects should be scaled based on the Replacing or Replaced objects' scale. Wire Color From Object(s) – Specifies whether the resulting objects should be using the Replacing or Replaced objects' wire colors.
Start Preview – Initiates a live preview directly in the viewport.
Reset Options – Restores all settings back to their default values.