VRay.info _ Tutorial_ Setting Up a Daylight Scene With v-Ray

8/20/2019 VRay.info _ Tutorial_ Setting Up a Daylight Scene With v-Ray

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Shadi Younis is a 32 year old

self-taught 3D artist from

Jordan, at the moment living and

working in the kingdom of

Bahrain as a 3D visualization

specialist.

He has been using 3ds Max for

the past 5 years and using

V-Ray for about 3 years.

Currently he is in the preparationstage of an interesting project

called THE QUICKSAND

PROJECT, in which a team o f

2D and 3D artists from Jordan

join forces to create a unique

mixture of both worlds. A link to

the project will be announced

soon.

Download scene file

3ds Max 2010, 1.06MB

(Textures no t included)

Tutorial by Shadi Younis

This tutorial shows you the basics of how to set up daylight lighting in V-Ray using VRaySun and a 3ds Max

daylight system for precise control of time of day and location.

In this tutorial we will start by lighting our scene with a VRaySun inside a 3ds Max daylight system in order to have

accurate time and location control.

Switch to top view and go to the create menu > systems > daylight system. Now click and drag a daylight in thecenter of your scene. (see image below)

Now we need to change the settings of the Max daylight system so that it uses a VRaySun to light our scene.

Select the daylight sys tem and in the modify panel select VRaySun from the Sunlight dropdown menu. Accept therequest to automatically add a VRaySky environment map. We will be using the automatically created VRaySky

environment map to light the scene, so we also need to disable the Skylight. Select from the Skylight

dropdown menu. (see image below)

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.info | Tutorial: Setting up a Daylight Scene With V-Ray http://vray.info/tutorials/vray

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We can now use the daylight system to accurately position our VRaySun and we do so by clicking on the setup

button in the modify panel and then adjust our time and location to our needs. In this example I have set it to 15:45

and this gives me a low angel for the sun, thus creating a nice afternoon mood. (see image below). TIP: Having the

sun at close to a 90 degree angle will resemble 12:00 mid-day resulting in a brighter scene.

Before we go to rendering we need to adjust our VRaySun and create a VRayPhysicalCamera in order to have

physically correct exposure.

Go to the VRaySun rollout of the daylight system in the modify panel, and select CIE Clear from the sky model

dropdown menu. This setting gives you a few presets of physically correct sky models that will contribute to the

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overall lighting of our scene. (see image below)

Now in the top viewport create a VRayPhysicalCamera and point it at the object. (see image below)

Select the VRayPhysicalCamera and go to the modify panel and adjust the distortion to 0.25. This will curve

the camera lens slightly just like the lens in real world cameras. Then set the vignetting to 1.3 which will mimic an

effect produced by the lens that darkens the corners of your image. This will help draw the eye to the center of the

image. White balance is important because it will affect the overall color tone of the image, a light blue will balance

the image and a dark blue will give us a more yellowish tone whereas a light orange will give us a cold blue tone.

Feel free to play with this, and at the end of this tutorial there are a few images showing the effect of color balance.

The last thing to set in the VRayPhysicalCamera is the film speed. The higher the value the brighter the image just

like in real world films. This value represents the films sensitivity to light, and in this case we set it to 120 (see

image below).


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If you render your scene at this point it will look like the image below.

Lets quickly set the 3ds Max gamma setting to a L inear Workflow (If you haven't already) so we can get the

correct colors. Go to the customize menu > preferences, and then select the Gamma and LUT tab. Check enable

Gamma/LUT correction, and adjust your gamma value to 2.2 and set input gamma to 2.2 and output gamma to 1.0


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(see image below). Editor's note: We will soon feature a Linear Workflow tutorial on the site, exploring this in depth

with regards to Why and How.

Now let's jump to the render se ttings. Hit F10 to open the render dialog box, go to the VRay tab and enable

built-in frame buffer. This will allow us to further control our exposure and colors after the rendering is done and will

be a huge time saver. To ensure image sampling happens at the correct gamma level for our render we need to

adjust the gamma to 2.2 and enable Don't affect colors(adaptation only). Unless we do this the image sampler will

be using gamma 1.0 to determine if sampes are within acceptable noise thresholds, and we end up with a more

noisy image when viewed at gamma 2.2 (see image below).


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Move to the Indirect Illumination tab and enable GI. For primary bounces we will use Irradiance map, and for

secondary bounces we will use Light cache. This combination gives us a fast plus clean render. well… fast-ish (see

image below).

Now that we have chosen our GI method combination we need to adjust them, so go to the Irradiance map

section and choose medium. Or if your computer is slow you can set it to low or very low and do a bit of

compromising. Enable show calc phase, this will let you see the irradiance map while it's being calculated (see

image below).

In the Light cache section set the subdivs to 1500 and (or if your computer is slow set it to around 800, but notlower if you need a good quality image). Also enable show calc phase to see the light cache while it's being

calculated (see image below).


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We are done now, and you can render the scene. In the VRay Frame Buffer you have to cl ick on the sRGB

button to see the final result of our gamma correction. Also and notice that you can enable the curve editor by

clicking its icon at the bottom of the VRay Frame Buffer window and then adjust the color to your liking. Remember

to save your images in a linear format, like Open EXR, as this will ensure that the image displays c orrectly further

down your pipeline (see image below). If you want to save to a format line PNG, TIFF or JPG you should change

the output gamma in the save dialog to 2.2 to burn in the gamma.

here is the final image:


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Some variations in color balance:

I hope that you have enjoyed this tutorial and happy rendering .


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28 Comments

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48design Karlsruh e •

Thanks!

• •

Kevin Mutiso •

thank you very much

• •

Kevin Mutiso •

thank you very much

• •

Κατερίνα Καρατζά •

Thank youuuuuuuuu!!!!!!!!!!!

Tomáš Vuinci Vince •

Can you help me? I have a problem with rendering. While it building light

cache it looks good but in finish it is little bit dark. I'm doing everything as in

this tutorial. Can you help me where should be the problem? There are my

images http://www.dnesne.sk/render-on... - while building light cache and

the second http://www.dnesne.sk/render-tw... at the end of rendering


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VRay.info _ Tutorial_ Setting Up a Daylight Scene With v-Ray