What is V-Ray light cache?

What is V-Ray light cache?

Light caching (called “light mapping” in older versions of V-Ray) is a technique for approximating the global illumination in a scene. The light cache is built by tracing many, many eye paths from the camera. Each of the bounces in the path stores the illumination from the rest of the path into a 3d structure.

What is primary bounce and secondary bounce in light?

A primary diffuse bounce occurs when a shaded point is directly visible by the camera, or through specular reflective or refractive surfaces. A secondary bounce occurs when a shaded point is used in GI calculations. Light Cache GI – Traces multiple paths from the camera.

What is Max Subdivs in V-Ray?

Max subdivs – Determines the maximum number of samples for a pixel. The actual maximum number of sampler is the square of this number (e.g. 4 subdivs produces a maximum of 16 samples).

What is Subdivs?

Filters. (law) Abbreviation of subdivision. ( referring to a publication)

What is min shading rate in V-Ray?

Min shading rate – Controls the number of rays shot for Anti-aliasing (AA) versus rays for other effects like glossy reflections, GI, area shadows, etc. This setting is especially useful with the Progressive image sampler.

How reduce V-Ray render in Maya?

To denoise a separate Render Element, select it from Render Settings > Render Elements > Added Render Elements. In the Attribute Editor, go to Extra Vray Attributes and enable the Denoise option.

Why is light cache taking a long time?

Also, check your RAM usage, you may be running out of RAM in your heavy scene. All Calculation of GI are camera dependent so if there are objects with problems in view, it will make your Lightchache work more than if they are out of the view. Still hours for Light cache seems wrong.

How do I save V-Ray light cache and irradiance map?

If you have never used Irradiance Map and Light cache before, here are some tips for you.

  1. Step 1: Enable GI setting and set up for yourself.
  2. Step 2.1: Create your . vrmap file (Irradiance Map).
  3. Step 2.2: Save your . vrmap file.
  4. Step 2.3: Create your . vrlmap file (Light Cache).
  5. Step 2.4: Save your . vrlmap file.

What is brute force in 3ds Max?

Overview. The Brute force method for computing global illumination recomputes the GI values for every single shaded point separately and independently from other points. While very slow, this method is very accurate, especially if you have many small details in the scene.

What is Subdivs 3ds Max?

– When working with V-Ray specific versions of tools, such as lights, cameras, materials and so on, we will often times come across a parameter entitled subdivs, which is short for sub divisions. Especially so if we’re coming to V-Ray after working with Mental Ray in 3ds Max.

What is irradiance map in V-Ray?

In V-Ray, the term Irradiance map refers to a method of efficiently computing the diffuse surface Irradiance for objects in the scene. The Irradiance map is in fact a collection of points in 3D space (a point cloud) along with the computed indirect illumination at those points.

What is the difference between brute force and irradiance map?

Brute Force GI – The simplest approach where indirect illumination is computed individually for each shaded surface point. Irradiance Map – Indirect Illumination is computed for a few points in a scene, and remaining points use interpolated values.

What is OpenSubdiv?

OpenSubdiv is a set of open source libraries that implement high performance subdivision surface (subdiv) evaluation on massively parallel CPU and GPU architectures. This code path is optimized for drawing deforming surfaces with static topology at interactive framerates.