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title: "Options Tab"
canonical: "https://documentation.chaos.com/space/VRAYHOUDINI/113279041/Options%20Tab"
format: markdown
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This page provides information on the Options tab of the V-Ray Renderer parameters.
## **Overview**
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The Options tab globally control some geometry, lighting, material, and texture aspects of the rendering. For example, these options can be used to disable all shadows in your scene, or to use probabilistic light sampling to speed up test renders.
> ✅ Depending on the rendering engine, the corresponding unsupported options are disabled from the parameters.
## **Geometry**
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## **Lights**
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## **Materials**
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## **Textures**
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## **Volumetrics**
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## **Rendering**
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## **Raycaster**
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## **Units**
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## **VFB**
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## **UI**
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## **Example and Workflows**
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> Macro (anchor)
### **Example: Secondary Rays Bias**
This example shows the effect of the **Secondary rays bias** parameter. The scene below has a box object with a height of *0.0*, which the top and bottom of the box occupy exactly the same region in space. Due to this, V-Ray cannot resolve unambiguously intersections of rays with these surfaces.
The first image shows what happens when you try to render the scene with the default settings. You can see the splotches in the GI solution, caused by the fact that rays randomly intersect one or the other surface:
In the second image below, the Secondary rays bias is set to *0.001*, which offsets the start of each ray a little bit along its direction. In effect, this makes V-Ray skip the problematic surface overlaps and render the scene correctly:
Note that the Secondary rays bias affects only things like GI, reflections, etc. In order to render the scene properly, the material assigned to the box has its 2-sided option checked. This is so that the object looks in the same way regardless of whether the camera rays hit the top or the bottom of the box. If the material did not have this option checked, it would appear "noisy" even though the Secondary rays bias is greater than *0.0*:
> Macro (anchor)
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### **Example: Adaptive Lights**
Below is an example rendering of a scene with the default **Bucket** Image Sampler settings, using **Brute Force/Light Cache** GI engines. Only the **Threshold** parameter was set to *0.001*. Notice how the render time is reduced significantly in favor of the Adaptive Lights in comparison to Full Evaluation.