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title: "V-Ray Procedural Clouds in Houdini"
canonical: "https://documentation.chaos.com/space/VRAYHOUDINI/113280378/V-Ray%20Procedural%20Clouds%20in%20Houdini"
format: markdown
---
This page gives details on how the V-Ray Procedural Clouds work in Houdini. Overview Craft just the right cloudy sky for your environment in just a few clicks with V-Ray Sun and Sky’s new procedural clouds system. Easily simulate a variety of cloud types and weather conditions, from partly cloudy to overcast. Render realistic stills, or dynamic timelapses. To download scene files:  Want to follow along but don’t have a license?:  Workflow Environment Sky The one way to set up Procedural Clouds is through the V-Ray Environment node: ||out Network|| >  V-Ray  >  V-Ray Environment Inside, create a  V-Ray TexSky  node and connect it to  Background ,  GI ,  Reflection  and  Refraction  ports of the Environment Settings. Go to  V-Ray Render Settings  >  Environment  and connect the newly created  V-Ray Environment  to it. Note that you would need to have a  V-Ray SunLight  with the  Clouds  feature  Enabled . If the Sun’s position changes, that reflects on the Procedural Clouds.  Sky Texture Procedural Clouds can be created using a  V-Ray TexSky :   ||mat Network|| >  V-Ray  >  Texture: Procedural  >  V-Ray Sky Attach the  V-Ray TexSky  to a  V-Ray Dome Light . Note that you would need to have a   V-Ray SunLight  with the  Clouds  feature  Enabled . If the Sun’s position changes, that reflects on the Procedural Clouds. Notes By default, the VRaySun and VRaySky are very bright. In the real world, the average solar irradiance is about 1000 W/m^2. Since the image output in V-Ray is in W/m^2/sr, the average RGB values produced by the sun and the sky are about 200.0-300.0 units. This is quite correct from a physical point of view, but is not enough for a nice image. You can either use  Color Mapping  to bring these values to a smaller range (which is the preferred way), or you can use the Sun's Intensity multiplier to make the sun and sky less bright. Using the  V-Ray Physical Camera  with suitable values also produces a correct result, without changing the sun and sky parameters.