From the course: Cinema 4D R18 Essential Training: Product Visualization and Design

What is multipass rendering? - CINEMA 4D Tutorial

From the course: Cinema 4D R18 Essential Training: Product Visualization and Design

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What is multipass rendering?

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- [Instructor] All the renders we've looked at so far have been flat. That is to say, the diffuse, shadows, reflections, refractions, et cetera have all been rendered out into a single image much like what we've seen here. Now for any creative control in your post-production work, you're almost always going to want to opt for a multi-pass render. So here we have this regular image and this client wanted to reduce the reflections and might say hey why are these buttons glowing when the device isn't actually plugged in? Could you go ahead and make those changes? And be like well I have to re-render this whole thing now. So let's look at what a multi-pass render can do to help our workflow. So this is the exact same render but it's been split up into layers. So we have our diffuse color and then that's with the normal blending mode and then the shadows are multiplied on top and then we have the ambient which is this glowing buttons here and the reflection as well. That's providing a lot of the sort of lighting information in this scene as well. So we could certainly dial that down a bit or you could even make it stronger if you duplicated the layer. You could really have some areas, if you use some masks and stuff, some areas could be really reflective and quite bright, maybe even around here and then others could just be less so. You could just mask those out. So we'll just delete that layer for now and then yes if we wanted to tone down the ambient with them we can come in and just make this much less and now our client's happy and we didn't have to render and that took us just a couple of seconds to do that change. So with multi-pass you can split the diffuse shadows, reflections, refractions, et cetera into separate layers. So we can also come in and defect the shadows and the diffused color all without having to re-render from CINEMA 4D. This is really powerful. Just remember with a multi pass workflow, the image has been split into separate layers enabling you to fine-tune the intensity of each pass. You have complete control over the final image. Now, let's move on and look at how we'd set up a multi-pass render in CINEMA 4D.

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