An option to make objects invisible to the camera and rendering, but cast shadows.
This can be useful, for example, for shading trees on the ground or building without the trees being in view. Or blocking sunlight in your scene, like shadows of clouds in the right place in your scene.
Hi Dadi!
Of course this is a solution in many cases, but sometimes it is useful to use objects for extra shadows or effects of light (selective lightning). As you can do for example in Blender, 3dsmax etc. Or you use the shadow of the tree, but replace it with a specific kind of tree using photoshop.
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