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Maxwell Render 2.5 User Manual

Chapter 10. Maxwell Materials | 70

Maxwell Render has a highly sophisticated set of parameters designed to simulate both

surface and subsurface scattering. You will nd Subsurface Properties for each BSDF as a

collection of parameters under a collapsible rollout. These parameters are:

F.03 SubSurface Properties panel

• Scattering: Scattering color is the reectance of inner particles causing subsurface

scattering. This means that the incoming light will be reected/ scattered in this color.

• Coef: This coefcient denes the amount of particles inside the medium. Coef=0

(default) means there will be no subsurface scattering. In other words, the rays will

pass through without hitting a particle. The higher the coefcient value, the more

opaque/ less translucent the medium is. For example, lemonade is more translucent

while marble is more opaque.

• Asymmetry: Asymmetry denes the isotropy of scattering. Asym=0 (default) means

that light rays will be scattered equally in all directions. A negative value will let the

light rays go through while a positive value will send the rays backwards. Besides

the volumetric subsurface scattering just explained here, Maxwell Render also has

a Single Sided mode which helps you simulate thin translucent materials like paper,

leaves, and lampshades. The remaining parameters under this rollout only control

Single Sided scattering.

• Single Sided: When this checkbox is ticked, Maxwell Render will disregard the volume

of your object and consider it a hollow polygon surface with a virtual thickness. The

aforementioned SSS parameters are also valid in this new mode. The value sets the

virtual thickness of your surface in mm. You can also use a thickness map for more

complicated effects.

• Min/max: These values dene the minimum and maximum virtual thickness and are

only available when a thickness map is used. The thickness map will be treated as a

grayscale map using this given range. When this checkbox is ticked, Maxwell Render

will disregard the volume of your object.

While the parameters under Subsurface Properties dene the characteristics inside the

medium, they are not enough to give the material its nal look. We also have to specify

the properties of the light ray that enters the material. Here, transmittance, attenuation,

Nd and roughness play key roles.

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Arrow Group Industries LM86 Manual do Utilizador Página 70