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Z-Sort Sorting the objects of a scene on the Z-axis is essential for any 3D program in order to render correctly. The renderer starts by rendering the object furthest behind, and then mixing in objects closer and closer to the camera. Sometimes the machine gets “confused” with what should be rendered first and last because it calculates this from what is the center of the object’s Z position. A typical example of a Z sort problem is when two colored objects have rotated their Y axis to for example -12.0.

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In this case the default behavior for a render engine is to render the first object (green) with a Z position 0.0 first, and then the second object (red) with Z position 1.0 last. However, when objects are rotated the output will be wrong because the red object should be rendered before the green due to the rotation of the objects. This can be corrected by adding the Z-Sort plug-in, which lets users manually sort objects using the logic of the tree structure. Hence, what is placed at the top of a group in the scene tree gets rendered first, and what is placed below will be rendered after.

Sorting is solved by rendering the second (red) object first, and then the first (green) last. Be aware that although the red object has a Z positon of 1.0 and the green 0.0, the red object must be rendered before the green because of the overlapping rotation (Y -12.0). Normally objects that are furthest behind should be placed at the top in the scene tree. The Z-Sort plug-in disables the automatic Z-sort for a container. How the elements in the container get sorted in the Z-buffer is then dictated by the order of the objects in the scene tree. Copyright © 2013 Vizrt.