Setting camera white balance for V-Ray - Evermotion.pdf

(http://www.evermotion.org/modelshop/show_product/archmodels-vol-138/10722/0/0/)

MARCIN BIAŁECKI | 2013-12-05 13:22 |

TUTORIAL (/TUTORIALS) > 3DS MAX (/TUTORIALS/CATEGORY/3DS-MAX/14/0/)

> rendering (/tutorials/category/rendering/14/4/1)

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Color temperature is a characteristic of visible light that has important applications in

lighting, photography, videography, publishing, manufacturing, astrophysics and other

fields. Today I will explain setting color balance for V-Ray renders. My example is the

scene with a small bridge over a river.

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Setting camera white balance for V-Ray - Evermotion.org http://www.evermotion.org/tutorials/show/8350/setting-camera-white-ba...

1 of 14 1/10/2014 4:35 PM

Before I opened 3ds max, I looked for some references. I usualy download quite a lot of

them each time. It makes me more confident and it`s easier to find the right idea. To make

this scene I found some nice views with small bridges. As you can see below, there can

be many approaches to this kind of visualization.

Click on image to enlarge

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2 of 14 1/10/2014 4:35 PM

References

Modeling

I like to model the environment first. I start with modeling the ground, bottom of the river

etc. Next, I put main models in the scene like trees (not necessarily high poly - they can be

just simple mesh) , bridge, surface of river etc. which are slowly making outline of final

scene. Then I set the camera.

Camera

All camera settings in this scene are nearly deafult, except one important option.

Camera settings - custom balance

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3 of 14 1/10/2014 4:35 PM

I used custom balance which allowed me to make additional modifications of the image

output. Then I set V-Ray:

V-Ray settings

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4 of 14 1/10/2014 4:35 PM

V-Ray settings

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5 of 14 1/10/2014 4:35 PM

V-Ray settings

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6 of 14 1/10/2014 4:35 PM

V-Ray settings

Before rendering, remeber to check the option "Override material" and change it to 50%

grey, which is listed as grey 128.


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7 of 14 1/10/2014 4:35 PM

(http://www.evermotion.org/files/tutorials_content/uploads

/005_Render_setup_Override_mtl.jpg)

Creating override material

First render almost never looks good (as we all know). It`s often too dark or too bright. We

need to combine good settings of our lights, camera and in some cases HDRi. We will use

our override material and color balance so we can find the best temperature of our scene.

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8 of 14 1/10/2014 4:35 PM

Mostly I use 3 options in camera to achive right lighting:

f-number - This parameter controls the aperture size of the virtual camera. Lowering the

f-number value increases the aperture size and so makes the image brighter, since more

light enters the lens. In reverse, increasing the f-number makes the image darker. This

parameter also determines the amount of the DOF effect.

Shutter speed - This parameter determines the exposure time for the virtual camera.

The longer this time is (small Shutter speed value), the brighter the image would be. In

reverese - if the exposure time is shorter (high Shutter speed value), the image would get

darker. This parameter also affects the motion blur effect.

film speed (ISO ) - this parameter determines the sensitivity of the film and so the

brightness of the image.

Of course, Vray-Sun has also few more options for adjusting brightness or color of scene:

Turbidity - this parameter determines the amount of dust in the air and affects the color

of the sun and sky. Smaller values produce a clear and blue sky and sun, while larger

values make them yellow and orange, often seen in big cities.

Ozone - this parameter affects the color of the sunlight. Available in the range between

0.0 and 1.0. Smaller values make the sunlight more yellow, larger values make it blue.

Intensity multiplier - this is an intensity multiplier for the VRaySun. Since the sun is very

bright by default, you can use this parameter to reduce its effect.

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9 of 14 1/10/2014 4:35 PM

Size multiplier - this parameter controls the visible size of the sun. This affects the

appearance of the sun disc as seen by the camera and reflections, as well as the

blurriness of the sun shadows.

When I am happy with brightness of the scene, I can start my rendering. I made my first

render with pure white "custom balance" option. Then I looked for the area in my render

which was not directly illuminated by the sun or shadowed. Then I picked a pixel with a

middle tone value (not too bright and not too dark) and replaced white custom balance

with blue / grey value that I just picked.


Finding right custom balance value

What it does?

Simply speaking, this whole operation will take our blue / gray color (sky influence) and

exclude it from the scene, making the overall look more natural.

This method is also often used in the cinematic industry. Usually real gray sphere is used.

It is put in the middle of the room and photographed. It can be used for setting up the 3D

environment to match the cinematic footage or it can be used for making HDRI.

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10 of 14 1/10/2014 4:35 PM

More about it you can watch in "Sur La Piste du Marsupilami - Visual Effects Making Of

(http://www.evermotion.org/articles/show/8062/sur-la-piste-du-marsupilami-visual-effects-

making-of)".

At the end I want to share with you my river shader settings. I made the river 300 cm deep

(remember that results of fog color and fog multiplier depend of the depth of river).


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11 of 14 1/10/2014 4:35 PM

(http://www.evermotion.org/files/tutorials_content/uploads/008_water_material.jpg)

Water material

Thank you!

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12 of 14 1/10/2014 4:35 PM

Author: Marcin Białecki | Editor: Michal Franczak

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TAGS: CAMERA 3DS MAX LIGHTING RENDERING V-RAY COLOR GRADING BALANCE WHITE

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A.Jakobitz (http://www.evermotion.org/portfolios/show/a-jakobitz/746795) 09:58:51 |

08-12-2013

nice

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kadmaster (http://www.evermotion.org/portfolios/show/kadmaster/721506) 15:42:43 |

09-12-2013

Thanks a lot...very useful tip for me and everyone... Max gods send MARCIN BIAŁECKI to

us...:)

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dollmaker (http://www.evermotion.org/portfolios/show/dollmaker/818782) 21:14:48 |

16-12-2013

Very interesting..

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olli (http://www.evermotion.org/portfolios/show/olli/706360) 20:00:30 | 17-12-2013

hmm, it looks like you are using the linear workflow, you should know that a 50% grey is

actually around 55 and not 128 if you are using the linear workflow correctly ;)

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Setting camera white balance for V-Ray - Evermotion.pdf

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