Using the Cycles Render Engine How can I make an object invisible when I render?
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2$\begingroup$ possible duplicate: Making an Invisible Material in the Cycles render engine $\endgroup$ – David Mar 2 '16 at 23:24
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$\begingroup$ @David I did look at that question and thought of adding into it, but the question is about animating the disappearance of an object it made no sense... $\endgroup$ – user1853 Mar 3 '16 at 0:57
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These are some of the options to make an object not render in Cycles.
To make the object invisible/unrenderable
Disable the object for rendering (turn off the camera icon)
Move the object you don't want to a layer that is not renderable
Give it a transparent shader:
To make the object invisible to camera but keep the shadows and interaction with other objects (reflections, etc)
Restrict the visibility for camera:
Using Nodes: use a light path so the object is invisible to the camera only:
To make the object transparent as alpha channel:
use a holdout shader so it renders as transparent
Place the object on a different layer and use that layer as mask:
Use a Pass index for the object and use that on the compositor to subtract the object from the final render:
(click on the image to enlarge)Similarly, you can assign a pass index to the material and use that as alpha on the compositor:
(click on the image to enlarge)
For the last three options the Transparent Background option has to be enabled:
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3$\begingroup$ +1, I like. However, I don't understand why you said that Transparent has to be selected. It worked for me without that enabled. $\endgroup$ – bertmoog Jun 30 '17 at 2:05
