I am trying to use a gobo in cycles but having no luck at all. Seems that the transparency is not working. What am I doing wrong? Is the PNG broken?

Thanks, Douglas E Knapp

  • $\begingroup$ Thanks. Chebhou. Can you do it as part of a spotlight? PS the UV unwrap was not part of my first question but a second try by me to make it work. $\endgroup$ – Douglas E Knapp Mar 5 '15 at 19:10
  • You have unwrapped your object but didn't use the UV coordinates
  • you are using the color from the image instead of the alpha
  • the non transparent part of the object is better to have a material

here is node setup for the object :

enter image description here

  • if you want the other part to be transparent switch the order of the 'transparent' and 'diffuse'
| improve this answer | |

I'm personally doing it this way:

  • Create a Sun
  • Set the Lamp size value to 0
  • Create a plane in front of the sun
  • Unwraping it and extend border edges to cover your scene
  • Add the gobo (see the network in the GIF below)
  • RENDER !!
  • Node Setup

    Click here to see it on Gfycat

    | improve this answer | |
    • $\begingroup$ can you please make a static (and bigger and more readable) image of the node setup? and add it to your answer? $\endgroup$ – user1853 Nov 30 '15 at 22:16
    • $\begingroup$ @cegaton Sure. Edited $\endgroup$ – melMass Nov 30 '15 at 22:22
    • $\begingroup$ nice (second) answer. Good job, keep it up. $\endgroup$ – David Nov 30 '15 at 22:33

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