The Living - Light Balance | Learn V-Ray
 

The Living – Light Balance

Lesson by Ciro Sannino | Official 5SRW study material


LESSON#28 – Framing/Light Balance (step1-2)

  • Analysis of the light contributes
  • Analysis of the shot and the composition rules
  • Lines/distortions/3rd rule
  • Use V-Ray Light as Portal
  • Outdoor and indoor application
  • With and without “simple” option
  • Curtain material
  • Overexposure control
  • Exponential Color mapping
  • HSV Exponential Color mapping
  • “200-50-10” sequence for exposure

The most important thing to do in each scene is
understanding the situation and choosing the best way to approach.

The scene we’re going to study is an interior with a lot of diffuse light because of the curtains.
This is the final render you will create at the end of this chapter:

What do I mean by “correct approach”? I mean at first considering these 3 aspects:

1) V-Ray Light “Portal” mode:
This option “push” inside “the exterior light to produce diffuse shadows, which is impossible with only V-Ray Sky

2) Color mapping Exponential:
Because of the big difference (= too high contrast) from exterior and interior we have to use Exponential Color Mapping, so we can avoid strong overexposures on the curtains

3) Shutter speed 1/50:
The quantity of light in the daily interior is usually classified as “average”, so we can start increasing the time of exposure by setting Shutter Speed 1/50 (default value is 1/200 which is perfect for daily-exteriors)

 

Framing & Light Balance (steps 1-2)

In this video, we are going to learn how to create a good Composition (step1),
and how to arrange a perfect Light Balance(step2) by using V-Ray Light Portals:

Subtitles: Click on  [CC] bottom/right to enable English subtitles

CONCEPTS:

  • Important info about The Rule of Thirds / composition;
  • In this kind of scene we just have diffuse lights = no particular hierarchy;
  • Natural and diffuse light in interior can be easily simulated with a V-Ray Light Portal;
  • Correct position for the “portal” is 30-40 cm outdoor;
  • SIMPLE option is useful to bypass any object between the portal and the exterior;
  • With SIMPLE option we can put a portal light in the interior, close to the curtains;
  • Portal Light with “Simple” produce less noise than without simple;
  • We can use HSV Exponential to avoid overexposures, preserving the sky nuances.

Nota: to have a general idea about the quantity of light in different situations we can keep in mind this:

Daily Exterior > intensity of light > HIGH > shutter speed = 200 (default)
Daily Intyerior > intensity of light > MEDIUM > shutter speed = 50
Night Int/Ext > intensity of light > LOW > shutter speed = 10

This sequence 200-50-10 is approximate but allows us to be immediately on the right way because these values are fairly consistent with the real world. Of course, the succession 200-50-10 is valid for f = 8 (default) and ISO = 100 (default).

 

ALWAYS USE “SKYLIGHT PORTAL” AT THE APERTURES

The “regular” V-Ray Light is the equivalent of a physical BANK LIGHT (click to see it)
The “portal” V-Ray Light is a sort of symbol. He tells to V-Ray to bring inside light and it produces ambiental shadows.

If you put a regular V-Ray Light out of the aperture you’re just putting a Bank Light out of your window!
Is this what you do in the real world?

Be careful, because if you DON’T active “portal” you could get a fake lighting.
At your windows always use Skylight Portal.

 


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