V-ray for nuke tips
In his third tutorial, Josh Parks shows how to generate and utilise the Position pass in V-ray for Nuke
Speed up your workflow by using Position pass
In last month’s article I covered how to set up a custom light setup that would allow you to utilise passes that we can generate in V-ray for Nuke in order to speed up your workflow. This issue I’m going to go over how to create and use the Position pass in order to generate custom mattes – speeding up our V-ray for Nuke workflow.
Being able to create mattes that dynamically move with our object is a must on projects that have a quick turnaround. Using a Position pass we no longer have to fiddle around with roto when needing to mask areas on our CG renders.
When working on a project, the supervisor or director may want changes with regards to lighting, or the way in which a material reacts. You could go in and alter your V-ray for Nuke materials, but I want to make you aware of how you can use the information in your passes to give you a quicker turnaround speed.
There are two different types of Position pass that we can use. One is a World Position pass. This references world space and creates a matte only when the object moves through a certain space. This makes it useful when you need to create a fake light hit or wanting to up the saturation of your obejct in a certain area of the world. To output this pass set the V-ray Sample Info to Pointcamera.
The second type of Position pass is Object Position. The values in this pass stay consistent to a specific part of the object, allowing us to create dynamic mattes that travel with our object – masking the same area, no matter where it moves in the scene. This is just called Point Object in the Vraysampleinfo node.
Remember you don’t have to use these mattes just to alter your beauty render, you can also use them to adjust specific sections of other passes. This gives you as an artist even more control over your final render. For all the assets you need go to creativebloq.com/vault/3dw207
Using Position pass we no longer have to fiddle around with roto when needing to mask areas on our CG renders