Join Brian Bradley for an in-depth discussion in this video Compositing elements, part of SketchUp: Rendering with V-Ray 3.
- [Instructor] Although the Fusion application has been around for a long time now it has in recent years received quite a boost in adoption due to the fact that it was purchased by Blackmagic Design who then proceeded to release a fully featured, free version of the application for full commercial use. To grab a copy, all you need do is head over to blackmagicdesign.com/products/fusion and hit the download button. Once you have that installed, you can open up the provided comp from the exercise files folder where you should have all of the render elements from the previous exercise loaded in and ready to go.
Now, although we are not going to have time in this video to cover use of all the elements that we have here, what we can do is quickly demonstrate how we would recombine some of the elements that we rendered out and then demonstrate a very simple post-production tweak. The first thing that we will want to do then is composite our lighting passes back together as these oftentimes make the best starting point for reconstructing an image. Just to the right of the GI and lighting passes then, let's add a merge node and then pipe both of our render elements into it.
It doesn't matter which is foreground and which is background here, so we can just left click on the output of each render element and drop it onto the merge node. To view the output of a particular node in one of the viewer windows, all we need do is left click and drag on it and drop it into the viewer window that we want to use or we could also right click on the node and tell it to be viewed on monitor one or two if we prefer. To view both passes composited together correctly, we need with the merge node selected to set the alpha gain value down to none which lets us view both render elements as we say composited together using the additive blending mode which is the default state on a Fusion merge node.
Next, we want to add the reflection and refraction elements together, so let's drop a merge node to the right of those and pipe both elements into it. Again, we need to set the merge node's alpha gain to zero so that when we view the output of that, we get the expected combination. We then need to add the specular element so as to accurately recreate our V-Ray render from SketchUp and so, let's drop another merge node onto the work area and pipe the specular element into that.
If we then pipe the output of the reflection/refraction merge into that also, set the alpha gain to zero and then drag onto the viewer window, we can see that things are looking pretty good. To combine these two separate groups of elements now, we can follow that same basic process of adding a merge node and setting the alpha gain to zero. What we have now as we view the output of that node is our V-Ray render fully reconstructed and if we compare the composite with the render that came straight out of V-Ray, the beauty pass, we see that the two are identical.
Of course, things don't look quite right because we are viewing the linear output that came from V-Ray here rather than the SRGB corrected version that we were seeing in the V-Ray frame buffer window. To rectify that, all we need do is add a brightness contrast node, set a gamma value of 2.2 on it and then when we pipe our merge four node into that and look at it in the viewer window, we get exactly the render that we were seeing inside of V-Ray for SketchUp.
And of course, we can do any kind of image manipulation that we want now and so, let's drop a color correct node into the GI stream here and add a little bit of warming to that. As I click on the pass through option now, you can see how we have quickly and easily changed the feel of our lighting a little bit which of course is the whole point of using a render element's workflow.
- Gamma handling in V-Ray 3 for SketchUp
- Working with interactive rendering
- V-Ray light types
- Working with irradiance mapping
- Rendering animations
- Working with the V-Ray camera
- Using the Materials UI
- V-Ray FX tools
- Stereoscopic 3D rendering
- Using V-Ray objects