8/7/2019 Artlantis 3 Radiosity

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Artlantis 3.0 Radiosity

This tutorial covers the radiosity parameters found in Artlantis 3.We will focus on each setting, analyzing their effects on the rendering quality and lightconditions. First, activate the proper checkbox in the Preferences menu to access all theextended parameters. The radiosity parameters have two main sub-sets.

I. Radiosity expert parameters

1. Accuracy

Defines the precision of the radiositycalculation. There is a scroll-down menuthat has three pre-defined settings : normal,medium and high.

Long range slider : defines the distance (inpixels) between the radiosity sampling points onthe image being calculated.The area between the radiosity sampling pointsare interpolated. The shorter the range thehigher the radiosity quality achieved. Valuesfrom 96 to 8, lower value means more samples

to calculate.

Short range slider : works similarly to theprevious one, but this one defines the specialprocessing for nearby surfaces. The longer therange analyzed for this type of process, thehigher the radiosity quality achieved. Valuesfrom 0 to 48, higher value means more samplesto calculate.

2. Lighting

Lighting defines the lighting conditions. Pre-defined settings for interior or exterior lightconditions can be activated from the scrolldown menu.

Before we continue, a short explanation isneeded here about how radiosity works.In real life, emitters emit photons. Popping fromobject to object, they light our world while losingtheir energy as they are partially absorbed bysurfaces.

1. First bouncecontrols the tone of thebounces that effects the surfaces receivingdirect light.A higher value means a larger contrast betweenthe light and shadows.

2. Next bounces controls the power of thebounces after the first bounce. More bounceproduces more energy on the surfaces; a higher

value means more light on surfaces that receiveindirect light.

3. Attenuation defines the amount ofabsorption of the energy. 1.00 means that theenergy is kept while bouncing toward, while0.50 means energy is halved for each bounce. Itaffects the contrast of the radiosity shadows.

4. Color bleeding controls the amount of colortransferred from surface to surface. Lowvaluedesaturates the radiosity calculation.