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In my scene it is required to position the lights close to the main object like this:

enter image description here

How I can make the light source invisible to the camera?

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3 Answers 3

Reset to default
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You can turn off Ray Visibility of the 'emission object'. In Blender 3.0+ go to Object Properties > Visibility, open up the Ray Visibility panel and disable the Camera property:

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As of Blender 2.8x, Ray Visibility panel is now part of the new Visibility Panel:

enter image description here

As of Blender 2.76 the Ray Visibility panel was renamed to Cycles Settings:

enter image description here

Blender 2.7x

enter image description here

You can also run the following script to toggle the Camera Ray Visibility for all selected objects:

Blender 3.1+

import bpy

for obj in bpy.context.selected_objects:

    # toggle mesh lights
    if obj.type == 'MESH':
        for slot in obj.material_slots:
            if slot.material:
                for node in slot.material.node_tree.nodes:
                    if node.type == "EMISSION":
                        obj.visible_camera = not obj.visible_camera

    # toggle light types
    if obj.type == 'LIGHT':
        obj.visible_camera = not obj.visible_camera

Blender 2.8+

import bpy

for obj in bpy.context.selected_objects:

    # toggle mesh lights
    if obj.type == 'MESH':
        for slot in obj.material_slots:
            if slot.material:
                for node in slot.material.node_tree.nodes:
                    if node.type == "EMISSION":
                        obj.cycles_visibility.camera = not obj.cycles_visibility.camera

    # toggle light types
    if obj.type == 'LIGHT':
        obj.cycles_visibility.camera = not obj.cycles_visibility.camera
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    $\begingroup$ Both of the answers produce the same result, but just to add that in the node setup you have much more control over things. $\endgroup$
    – Vladimir
    Oct 18, 2014 at 13:10
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    $\begingroup$ @Vladimir Note that disabling visibility in the object settings is slightly more efficient performance wise than a node setup. $\endgroup$
    – gandalf3 ♦
    Oct 18, 2014 at 18:49
  • $\begingroup$ @gandalf3 I didn't know that. But, maybe the node setup can be more useful if the performance is here there the same. Thanks for the tip. $\endgroup$
    – Vladimir
    Oct 19, 2014 at 11:32
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    $\begingroup$ Does not work correctly, it still appears in the bake $\endgroup$
    – Black
    Nov 29, 2017 at 20:01
  • $\begingroup$ Can I also exclude it from compositing layers like depth or normals? $\endgroup$
    – janispritzkau
    Mar 18, 2020 at 11:16
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You can set up a custom emission material by adding another Transparent BSDF and determine the (camera) visibility of each shader at render time by using the Is Camera Ray output of the Light Path node that serves as the Factor for the Mix Shader node:

enter image description here

Note: @gandalf3 mentioned that disabling the Ray Visibility is slightly more efficient performance-wise than this node setup.

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enter image description here

Well, in Blender 2.79 just turning the camera ray off did not work as I expected. So I did a new trick. It Works fine for me.

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    $\begingroup$ Answers should be more in depth than a simple screenshot. What did you do differently? Why was the accepted answer insufficient? FWIW, the accepted answer still works fine in 2.79, something else must be different in your scene. Is your light behind glass, for example? That would cause rays hitting it to be transmissions rays rather than camera rays. $\endgroup$
    – JtheNinja
    Jun 27, 2018 at 5:44

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