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VRay.com - Your source for all things VRay  ::  VRay for SketchUp  ::  Manual  ::  Sun and Sky

VRay for SketchUp Manual

VRay for SketchUp Manual

Sun and Sky

The V-Ray Sun and Sky are based off of research to accurately depict the sun and sky, which allows for easy recreation of the Sun and Sky. They are intended to work together as well as react to the angle and direction of the sun. In order to access to the sun location, in the main menu click "Windows", select "Model Info", then select "Location". This will allow you to select a location of the sun. You might control the time and the day in the "Shadow Setting".

V-Ray Sun - Shadow Settings

V-Ray Sun Settings

Using the Sun with the V-Ray Physical Camera

In order to properly use the sun, it is a necessity that it be used in conjunction with the Physical Camera. The Sun itself is extremely bright, and in order to maintain the characteristics of the model, the sun must be kept close to its correct intensity. To counteract the intense brightness of the sun it is important to create a proper exposure of a scene with the physical camera. Using the physical camera will also help accurately capture the correct colors of the sky as well.

Using the Sun with the V-Ray Physical Camera

Accessing the Sun Properties

The properties of the sun in V-Ray for SketchUp are controlled in conjunction with the Physical Sky properties under the Texture Editor for GI(Skylight) under Environment render options. Here you will find many different controls which change the appearance and affect of the sun. For right now we will maintain the default values

Exposing Your Scene with the Physical Camera

Since the best way to make use of the Sun is to also use the physical camera, access the V-Ray Options and in the Camera rollout enable the Physical Camera. To determine the correct exposure you will need to do a quick render of the image. If your image is too bright, or overexposed, then you will need to adjust the F-stop, shutter speed, or ISO value to compensate. It maybe helpful to view the color values in Float format, as this will help you determine the true brightness of your image. This can be viewed by right-clicking and holding anywhere in the frame.

The image below was rendered using the V-Ray Sun and the Physical Camera. This image used the following values to achieve the correct exposure: F-Stop= 16, Shutter Speed= 300, ISO= 200.

V-Ray Sun - Exposing Your Scene with the Physical Camera

If you do not want to use the physical camera it will be necessary to decrease the intensity of the sun by a significant amount, however, the sun and sky may not act in the way it was designed.

Adding the V-Ray Sky

In V-Ray for SkechUp the Sky is added in the environment rollout of the V-Ray options, click on the "m" next to GI parameters. You must have Indirect Illumination enabled to access this, so enable it if you have not already. Clicking the "m" should bring up the texture editor, and under Type select Sky. At the top you will notice the option to select a light source, the SketchUp sun is selected by default and VRay knows where the sun direction is coming from. Lastly, there is an option next to the button that says Override Sun's Parameters. This allows separate settings for the Sun and the Sky, but for simplicity and continuity it is recommended to have this unchecked. Now go ahead and repeat this process for the background. If we render again we'll notice that our white ground plane has a slightly blue hue to it. This is due to the influence of the sky on our scene.

Adding the V-Ray Sky

Time of Day and the Sun’s appearance

Now that we have added the sun and sky, let’s see how the sun reacts to changing the time of day. In order to change the position of the sun, simply adjust the time of year and day using SketchUp Shadow Settings. (You can adjust the location through SketchUp Model info). Now the appearance of the scene has completely changed sole based on the position of our sun. This allows users the flexibility to worry only about the time of day rather than adjusting the appearance and intensity of the sun and the background.

Time of Day and the Sun’s appearance - Morning

Time of Day and the Sun’s appearance - Mid-Day

Time of Day and the Sun’s appearance - Evening

Changing the Sun’s Appearance with Turbidity

Although the time and position of the sun will have the most affect on the appearance of the Sun and Sky, there are several other controls that will be helpful in adjusting their appearance. Turbidity essentially changes the amount of dust that is in the air. Values on the lower end or the spectrum will create a very clear blue sky as you would see in the country side. Having larger values will make the sky slightly yellow or orangish as you would see in the city. Think of turbidity almost as a control for the haziness of the sky.

Changing the Sun’s Appearance with Turbidity - Clear Day

Changing the Sun’s Appearance with Turbidity - Slightly Hazy Day

Changing the Sun’s Appearance with Turbidity - Very Hazy Day

Changing the Sun’s Appearance with Ozone

The other useful parameter in adjusting the sun is Ozone. Ozone changes the color of the sun itself from a slightly yellow tone to a slightly blue tone. This can be very useful for fine adjustments to the appearance of the sun.

Changing the Sun’s Appearance with Ozone - Ozone=0

Changing the Sun’s Appearance with Ozone - Ozone=0.5

Changing the Sun’s Appearance with Ozone - Ozone=1

Gamma Correction and the V-Ray Sun and Sky

Due to the physical nature of the sun and sky model it is intended to be rendered using a gamma corrected linear workflow. Gamma correction compensates for a monitor’s tendency to display mid-tones darker than they actually are. Most programs embed the correction for this into the image, but because of the nature of how V-Ray processes color information it does not correct for this. Ultimately the result is that the VRay Sky will appear too dark if it is not corrected for display on our monitors. Also if the image is not gamma corrected the influence of the sky will not be accurate either. Needless to say, gamma correction is very important, extremely so when using the V-Ray Sun and Sky.

The image on the left is has no gamma correction. This causes the sky to be dark and its colors to be inaccurate. The image on the right has been gamma corrected, which brightens the sky as well as having colors which accurately represent the sky’s influence.

Gamma Correction and the V-Ray Sun and Sky

Enabling Gamma Correction

In order to gamma correct images both the inputs (textures and colors) and output need to be adjusted. This is very quick and simple to do with V-Ray as well as not impeding on workflow. In Global Switches, there is a section in the bottom right corner containing the controls for gamma correction. To adjust the inputs check Correct RGB and Correct LDR Textures. To adjust the output change the Gamma value from 1 to 2.2

Enabling Gamma Correction


V-Ray 2.0 for SketchUp

V-Ray 2.0 for SketchUp
 
 
  V-Ray 2.0 for SketchUp Service Pack 1 Now Available
 

V-Ray 2.0 for SketchUp Service Pack 1 is now available for download. A few new features have been added and improvements have been made to many current ones. Also, V-Ray 2.0 for SketchUp now supports SketchUp 2014.

  • With the new Batch Render tool you can now render all SketchUp scene tabs with a single click.
  • V-Ray RT has been optimized for a more interactive experience and focused on a deeper integration with SketchUp.
  • Detailed scenes will be faster and easier to create with further improvements to V-Ray Proxies.
  • Thanks to your feedback, this release includes many bug fixes, including fixes to distributed rendering.
SketchUp 2014 Compatible

 

V-Ray 2.0 for SketchUp Now Available
Rendering by Dario Dubinsky

V-Ray 2.0 for SketchUp is a massive upgrade to V-Ray for SketchUp which includes a series of new feature introductions that enhance visualization workflow and render quality such as V-Ray RT, V-Ray Dome Light and streamlining scene complexity with V-Ray Proxy.

V-Ray 2.0 for SketchUp
Rendering by Dario Dubinsky

Click here for more information


Buy VRay for SketchUp
Buy VRay 2.0 for SketchUp

SketchUp is one of the most widely used and easy to learn 3D Modeling software on the market today. With V-Ray for SketchUp, users now have one of the most powerful rendering tools available to visualize their models with the upmost quality and realism. V-Ray works within the SketchUp environment allowing users to be able to efficiently incorporate the task of rendering within their current workflows.

  Windows Edition   ( Now SketchUp 2014 Compatible )
  Mac Edition   ( Now SketchUp 2014 Compatible )



Buy VRay 2.0 for SketchUp Student / Educational

The EDU edition provides students and training centers a substantial educational discount.

View Product Page   ( Now SketchUp 2014 Compatible )


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News News

Monday, March 24, 2014

V-Ray 2.0 for SketchUp now supports SketchUp 2014

V-Ray 2.0 for SketchUp now supports SketchUp 2014

V-Ray 2.0 for SketchUp Service Pack 1 is now available for download. A few new features have been added and improvements have been made to many current ones.

Click here for more information



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