Is there a Way to speed up rendering my arc vis In v-ray?

As of version 3.5 of V-ray, one of the best ways to speed up your rendering is to use Adaptive Lights. This is particularly true if you have a lot of lights in your scene. We’ve all been there where we’ve had to fill our scene with a huge number of lights, most of which are the same light type with the same settings. It can take what feels like forever for them to render. Adaptive Lights helps us avoid this problem.

So what exactly are they? Well, with Adaptive Lights, V-ray determines which light sources are most important, so ray tracing calculations are focused and more precise. V-ray had previously introduced an improved solution called ‘Probabilistic Lights’, which for every ray hit would randomly pick a small fixed number of lights for the solution. This was a massive improvement but it was prone to introduce additional noise in the image and therefore the Anti-aliaser could end up working harder than before!

In comes Adaptive Lights. This is a similar solution to the Probabilistic version, but it is more sophisticated about the lights that it selects to contribute to the solution. It does this by using the data that is gathered during the light cache pass. So rather than picking lights randomly for each ray hit, with Adaptive Lights V-ray will pick the desired number of lights that are most likely to affect the shaded point. This results in a quicker render as well as a less noisy solution. Perfect!

So you’re probably wondering how you use them. Firstly head over to the Global Switches rollout under the V-ray tab in the Render Setup window. With it set to Advanced, make sure that Adaptive Lights is set in the drop-down. Next to it you have the opportunity to set the number of lights that you want V-ray to include in the calculation for each ray hit. This is 16 by default but you will want to adjust this for each of your scenes.