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So I'm creating a room flooding video I've taken a picture of my room and and created a scene that has obstacles where my bed is and the walls are ect. What I want to do is render the fluid simulation against a transparent background so I can composite it on to the picture. The problem is I can't figure out how to make all the obstacles invisible and only have the fluid running through the scene and hitting the obstacles without the hdr making the fluid over exposed.

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  • $\begingroup$ You can set layers to be excluded from a render-layer (think foreground, middle ground, background). More information here: blenderguru.com/articles/… $\endgroup$ – August Mar 11 '18 at 17:55
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Yes, there is. In the properties panel ( to the right ) hit the button in the top bar next to the render setting (next to the camera) which looks like two pages. This is called the Scene settings. Under layer, you can choose which layer to render. Hope that helps :).

Edit: There is one more thing you can try. In the top right where it shows the different objects in the scene, you can’t hit the camera so they won’t be visible in the render. I’m not sure if this will preserve lighting though.

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  • $\begingroup$ It does not. This is so frustrating! $\endgroup$ – Alex Pensotti Mar 11 '18 at 20:15
  • $\begingroup$ What if you made the objects transparent using a material set to max transparency? $\endgroup$ – Raiyan Rizwan Mar 12 '18 at 0:21
  • $\begingroup$ The light will still pass through the transparent objects and the fluid in the scene will be effected by the HDR. im just looking for the best way to composite this simulation onto a picture. $\endgroup$ – Alex Pensotti Mar 13 '18 at 1:47
  • $\begingroup$ As much as I’d like to I’m afraid I cannot then help you as I have no idea. I’ll upvote your question hopefully someone can help. GL. $\endgroup$ – Raiyan Rizwan Mar 13 '18 at 2:53
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I believe the answer is the mask layer in the Render Layer Tab.

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