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Add note about LightmapGI only baking nodes under its parent #10247

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7 changes: 7 additions & 0 deletions tutorials/3d/global_illumination/using_lightmap_gi.rst
Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,13 @@ Setting up
graphics API limitations on those devices. On Android and web platforms,
only *rendering* lightmaps that were baked on a desktop PC is supported.

.. note::

The LightmapGI node only bakes nodes that are on the same level as the
LightmapGI node (siblings), or nodes that are children of the
LightmapGI node. This allows you to use several LightmapGI nodes to bake
different parts of the scene, independently from each other.

First of all, before the lightmapper can do anything, the objects to be baked need
a UV2 layer and a texture size. A UV2 layer is a set of secondary texture coordinates
that ensures any face in the object has its own place in the UV map. Faces must
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