Lesson#28 – Light Balance – [Daylight Living]

Video language: English




The most important step to do in each scene is to identify the situation and choose the best way to approach. The scene we’re going to study is an interior with a lot of diffuse light, coming from exterior and diffused by the curtains.

So, in this video, you’ll learn how to set a good composition and arrange a realistic light balance by using V-Ray light portals.


  • Try to use some composition rule, you’ll get this as a habit later. In this case the rule of thirds.
  • In this kind of scene, we only have diffuse lights. There’s no hierarchy.
  • Natural daylight illumination can be done with V-Ray portal lights.
  • Add curtains and create a “TwoSided” material for them, in this way the lighting becomes smoother, creating a nice atmosphere in the scene.
  • SIMPLE mode– Light intensity is determined by the environment color and color from objects behind the light. This option can speed up rendering by simplifying the tracing process.”
  • ACCURATE mode – Light intensity is determined by the environment behind the light. The Color and Multiplier parameters are ignored”.
  • Make curve corrections, saturation and exposure with Frame Buffer to improve the final image.
  • Use the Highlight Burn to reduce overexposed areas.
  • Don’t use Subpixel Clamp, this affects the whole range of light that V-Ray calculates during the rendering process.

Note: 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 Interior > 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).