If the Brute force is set as a Primary bounces GI engine, the Secondary bounces parameter will be inactive.īrute force algorithm is not adaptive, and simply calculates the GI for each pixel of the final image of the scene, not depending on its complexity, color and detail of objects. It is active only if the Brute force algorithm is set as an algorithm for rendering Secondary bounces in the corresponding dropdown list, because in this case, it will calculate the right amount of interreflections. Secondary bounces is the value that specifies how many times will the secondary rays interreflect further. That is, if Subdivs is 2, then this means that the original light ray will be divided into four rays after reflection if it is equal to 4, the original ray will be split into sixteen secondary and so on. The actual number of rays will be equal to the square of that number. Numeric value Subdivs it is not the actual number of such secondary rays. Subdivs is a parameter trivially influencing the number of reflected rays, to which every original light ray splits, when it reflects from the object of a scene. Here present two parameters: Subdivs and Secondary bounces. Screenshot of V-Ray:: Brute force GI rollout located in Indirect illumination tab of 3ds Max Renders scene dialog. Of course, the more diffusely reflected rays of the indirect light will the direct light ray be divided into, the more detail and less noise will be on the final image. If you remember, it was previously considered that the light ray from the light source falls on the surface of the scene object and is divided into a number of other rays, which in turn, bombard other objects of the scene (remember the example of the dandelion). Exact Brute force GIīrute force GI is a basic algorithm that establishes a fixed number of rays reflected from a point in the scene after hitting it by original ray of light. In this tutorial, we will consider the exact parameters and arguments for and against an Brute force GI vs Irradiance Map as the Primary bounces GI engine. In a previous tutorial on general GI settings and the principles of indirect Illumination, we learned what global Illumination is and why it is needed for photorealistic visualization. Hello everyone! We continue to setup a global illumination in V-Ray. Introduction Exact Brute force GI Approximate Irradiance Map Irradiance Map Basic Parameters Irradiance Map Detail Enhancement Irradiance Map Advanced Options Conclusion & Comments Introduction

Irradiance map vray settings