To remove an object from the current selection, hold down Ctrl and select the unwanted object. Press Shift again and continue your multiple selection.
A partition is a division of a pass, which behaves like a group. Partitions are used to organize scene elements within a pass. There are only two types of partitions: object and light. Light partitions can only contain lights, and object partitions can only contain geometric objects. You can add as many partitions as you need to a given pass, but an object can only be in one partition per pass.
Placing objects in partitions allows you to control their attributes by modifying them at the partition level rather than at the individual object level. The modifications only affect the objects in the partition for the specific render pass to which the partition belongs. This allows you to change object attributes on a per-pass basis.
Every render pass contains two special partitions : Background Objects Partition and Background Lights Partition. These partitions automatically include all the objects and lights not explicitly assigned to other partitions.
The objects and lights that appear in the background partitions depend on how you create the pass. For example, if you create an empty pass, all of the scene’s objects and lights are placed in the background partitions. Some pass presets, on the other hand, automatically create partitions (besides the background partitions) containing the objects that were selected when you created the pass.
These special partitions let you conveniently treat all the background objects together. For example, when you are defining a matte pass, you can turn off the visibility of all objects in the Background Objects partition so that they are excluded from the rendering process. You can define the contents of the background partitions by removing objects from the background partition.
There are several ways to create a partition: you can create an empty one and add elements to it or you can instantly create one that includes the objects you have selected. Either way, you can add or remove objects as described in the next sections.
To create an empty object partition
1. Make the render pass (to which you want to add the partition) the current pass.
2. Make sure that no objects are selected in your scene.
3. Choose Pass > Partition > New Partition from the Render toolbar to add a partition to the current pass. An empty object partition has now been created.
4. You can now name and add the appropriate geometric objects to your new partition (see To add objects to a partition).
To create a partition that includes objects
1. Make the render pass (to which you want to add the partition) the current pass.
2. Select the objects or lights that you want included in your partition.
• If a geometric object is selected when a new partition is created, the object is placed inside the (object) partition.
• If a light is selected when you make a new partition, the (light) partition contains the selected light.
• If you select both objects and lights, two separate partitions are created : one for the lights and one for the objects.
3. Choose Pass > Partition > New Partition from the Render toolbar to add a partition to the current pass. A new partition is created with the elements you selected and it is displayed as a subnode of the selected render pass in the explorer.
If you’ve created an empty partition, you probably want to put things in it. You can add objects to a partition by dragging-and-dropping them or by using the Add to Partition command in the Render toolbar.
1. In the explorer, make sure that the partition to which you want to add elements is displayed.
2. In a 3D view, select the object or objects you want to add to the partition.
Select only elements of the same type: you can add only geometric objects to object partitions, and only lights to light partitions.
3. After selecting the objects, Shift+click the partition to which you are adding the objects to include it in the selection.
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To remove an object from the current selection, hold down Ctrl and select the unwanted object. Press Shift again and continue your multiple selection. |
4. Choose Pass > Partition > Add to Partition from the Render toolbar. The selected objects are added to the selected partition.
Dragging and dropping objects to partitions
You can also add objects to partitions by dragging and dropping the objects directly onto a partition node in the explorer. The objects are added as subnodes of the partition. Notice that the objects still appear under the Scene node as usual, but now they are also associated to a particular render partition.
Removing Objects From a Partition
While building your render pass, you may have to remove objects from an existing partition.
To remove objects from a partition
1. In the explorer, expand the pass partition (click the + sign) you want to modify to display the objects it contains.
2. In a 3D view, select the objects you want to remove from the partition.
Select only elements of the same type: you can add only geometric objects to object partitions, and only lights to light partitions.
3. After selecting the objects, Shift+click the partition to which you are adding the objects to include it in the selection.
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To remove an object from the current selection, hold down Ctrl and select the unwanted object. Press Shift again and continue your multiple selection. |
4. Choose Pass > Partition > Remove from Partition from the Render toolbar. The selected objects are removed from the partition.
Copying Partitions Between Passes
You can also drag-and-drop partitions from one pass to another instead of recreating them individually for each render pass. This method is equivalent to copying and pasting the objects and attributes of one partition into another. Dragging and dropping a partition keeps all of the changes made to that partition until it is edited.
If a partition is no longer useful in a pass, you can delete it.
To delete a partition
1. In the explorer, select a partition.
2. Press Delete on the keyboard to delete the selected partition.
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