In this article we will show you how to render images using V-Ray® engine. The latest version, 3.40, has been furtherly improved, it is quicker than the previous one(s), but also more flexible and absolutely easier to be used.
When you start the rendering process for the first time, the mask you will get through is like the one you can see in the image below:
The arrow button you can find on the right side of this mask allows you to open the Advanced parameters section. In the next image you can see the way the mask appears with the Advanced parameters section visible. We suggest you to modify the Advanced paraments just in case you are a V-Ray expert.
As you start the rendering you will notice a first phase of the process, where the engine works in order to automatically adjust the exposure value for the scene. It is an automatic process, that lets the user saving a lot of time in setting up that value, compared with the previous versions of the engine. Moreover, you can change the Exposure Value even while you are rendering the scene (see the EV-Exposure Value slider in the next image). That’s an incredible upgrade compared to previous versions, as it is much more easy to setup the correct Exposure value now.
Let’s have a look at the controls available in the rendering mask above:
Mode: can be Interactive, Progressive, or Customized. Interactive mode means that user can interact while rendering the scene. This means that, as soon as the quality seems to be acceptable, user can decide to stop the rendering process at any time. While in this mode you can choose to see the standard image rather than the denoised one; the newest version of the engine, in fact, is able to elaborate the standard image and try to remove the noise affecting it. Denoised image is generated at the end of each rendering cycle; you can compare the standard and the denoised images switching the control you find at the top-left of the following image.
Look at the control you find at the top-right of the window: with it you can manage the priority of the rendering process. Normal priority allows you to split the cores of the computer so that DomuS3D® as well as the other WindowsTM applications will run normally: this mode will slow down the rendering process, possibly doubling the rendering time. High priority gives to the rendering engine all the power of the PC: this mode reduces the rendering time to the minimum possible. The third option (In Pause), allows you to temporarily keep the rendering process in stand-by (for example because you need to use other core-demanding applications), and start it again as soon as you’ve done.
You can choose the Progressive mode when you do not plan to follow up and interact with the rendering process directly.
In such a case it is possible to set the quality level you want to reach at the end of the process and/or the time limit for the process itself. After that time the rendering process will terminate, despite the quality you’ve set. On the opposite, as soon as you reach the desired quality the process terminates, even in case you did not spend all the time you specified. It is important, then, to get used with quality level (see related article paragraph to learn more about quality levels). At the end of the process, the Application will save both images, the standard and the denoised one (Note: denoised image will be created right at the end of the rendering process). You already learned the power of the denoising process: have a look at the following images for a comparison between a standard and a denoised image. You will notice that in most images the denoised solution is far better than the standard one. If you are using a previous version of the Application, you can consider that you’ll now be able to reach the same result as before in half the time, thanks to the denoising option!
Zoom of a standard image
Zoom of a ‘denoised’ image
Another great option you have available in the latest version of V-Ray®, is that anytime during the rendering process you can save the temporary image you see on screen, without interrupting the process. This is very useful if you want to start creating folders for the project, and you need to know how big the final image will be.
Did you notice how easy it is now to start a rendering process using V-Ray® 3.40? The latest version is really so easy to be used, and it takes care of setting up the rendering parameters in the best way on behalf of you. Lights will be used just in case they have a specific and perceptible role in the selected point of view. Also, the quality of the final image is better than before.
If you are upgrading your license, you will access the advanced parameters of the engine for old projects. That’s why those projects still contain the Customized mode in them.
You can keep on rendering them with this setup, or you can Reset the rendering setup using the new calibration made for V-Ray® v. 3.40: if you want to do that, select Interactive mode and click the Reset parameters button.
Resolution: It is the dimension of the rendered image. When you open the rendering mask for the first time in the project, resolution is the same of the Navigation window. In the resolutions list you can find most common values for daily use, such as A4, A3, … and different DPI setup.
In the advanced section of the rendering mask (Other options) there are other controls, let’s have a look at them:
Exposure: allows you to calibrate the exposure value using a small preview
Load, Save: with these buttons it is possible to load or save the rendering setup you have configured, so that you can use the same setup for future (and similar) projects.
Panorama: allows you to create not a single image, but a 360° Panorama, centered in the position the observer is in the Navigation window.
Stereoscopic: allows you to create a Stereoscopic image (or a Stereoscopic Panorama 360°, if the Panorama control is checked. Use this option if you want to create VR Panoramas to be used on Cardboard or Samsung Gear)
Those users coming from previous version will note so many news related to the rendering options. The following list summarize them all:
a. Automatic calibration of the exposure value
b. Dynamic calibration of the exposure value while you are rendering the scene
c. Automatic setup of the rendering parameters
d. Denoised image, allows you to save a lot of time (between 20 and 40%) thanks to elaboration of optimized image with noise reduction
e. Image calibration after the rendering, thanks to HDR format (see later on in this chapter)
Image quality is better than with previous versions of the engine
This article is valid for DomuS3D® 2017 and later versions