LIGHTING ANALYSIS

Used in conjunction with a fully processed radiosity solution, the new lighting analysis tools allow you to query luminance, illuminance, reflectance, and transmittance at a specific point, or the average values over an entire object, by simply placing the cursor over a given point in your scene.







More intuitive results can be displayed by setting the exposure control to display Pseudo Color. You have the option of setting the scale, using either metric or imperials units, as well as colored or grayscale styles. The Quantity pulldown allows you to choose the measured values as either Illuminance or Luminance. Pseudo colored scenes can also be rendered but, unlike Lightscape, will not render out with the scale, or numeric values on the final image.

Lighting designers may also be glad to hear that VIZ4 now supports 32-bit SGI LogLUV TIFF files which will allow you to export luminance and illuminance data for analysis in third party programs.

   
  Image courtesy of Guillermo Leal Llaguno - Scream!Point
Click to enlarge		 Image courtesy of Guillermo Leal Llaguno - Scream!Point
Click to enlarge		 Image courtesy of Guillermo Leal Llaguno - Scream!Point
Click to enlarge		  


LIGHTING AND DAYLIGHT SYSTEMS




 		  New to VIZ 4 are a set of physically based lights and daylight systems that conform with IES standards. A new rollout to the lighting tab now adds target point, free point, target linear, free linear, target area, and free area. Each of these new lighting types support several light distribution types. As well, all can use standard IES data files to define the lights distribution properties.

Another neat feature is the presets menu that allows you to insert predefined lighting types, without having to set them up manually.


Other presets include default light colors in the color section, but you also have the option of setting the color manually by adjusting the Kelvin value.


   
  Image courtesy of Guillermo Leal Llaguno - Scream!Point
Click to enlarge		 Image courtesy of Guillermo Leal Llaguno - Scream!Point
Click to enlarge		 Image courtesy of Guillermo Leal Llaguno - Scream!Point
Click to enlarge		  


DAYLIGHT SYSTEM

The new daylight system is an assembly consisting of Sunlight and Daylight objects. Fully animatable, you can create shadow studies, using exact geographic locations, compass directions and date and time. With this new assembly comes the option of 4 different lighting types: Standard direct light, IES Sun, IES Sky and Texture Sky.



Of particular interest is the new Texture Sky system that uses environment effects or a bitmap to simulate skylight. Using a bitmap in conjunction with Texture sky will allow you light your scene using the RGB values from each pixel of the bitmap, as a source of colored light.
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