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Material Options properties
3D
layers have Material Options properties, which determine how a 3D
layer interacts with light and shadow.
- Casts Shadows
- Specifies
whether a layer casts shadows on other layers. The direction and
angle of the shadows are determined by the direction and angle of the
light sources. Set Casts Shadows to Only if you want the layer to
be invisible but still cast a shadow.
 Use
the Only setting and a nonzero Light Transmission setting to project
the colors of an invisible layer onto another layer. Steve Holmes
provides a video tutorial on the Artbeats
website in which he demonstrates how to use layers with Cast Shadows
set to Only to cast shadows of specific shapes within a 3D scene. - Light Transmission
- The percentage of light that shines through the layer, casting
the colors of the layer on other layers as a shadow. 0% specifies
that no light passes through the layer, casting a black shadow.
100% specifies that the full values of the colors of the shadow-casting
layer are projected onto the layer accepting the shadow.
Use partial light transmission to create the appearance
of light passing through a stained glass window. - Accepts Shadows
- Specifies whether the layer shows shadows cast on it by other
layers.
- Accepts Lights
- Specifies whether the color of a layer is affected by light
that reaches it. This setting does not affect shadows.
- Ambient
- Ambient
(nondirectional) reflectivity of the layer. 100% specifies the most
reflectivity; 0% specifies no ambient reflectivity.
- Diffuse
- Diffuse (omnidirectional) reflectivity of the layer. Applying
diffuse reflectivity to a layer is like draping a dull, plastic
sheet over it. Light that falls on this layer reflects equally in
all directions. 100% specifies the most reflectivity; 0% specifies
no diffuse reflectivity.
- Specular
- Specular (directional) reflectivity of the layer. Specular
light reflects from the layer as if from a mirror. 100% specifies
the most reflectivity; 0% specifies no specular reflectivity.
- Shininess
- Determines the size of the specular highlight. This value
is active only if the Specular setting is greater than zero. 100%
specifies a reflection with a small specular highlight. 0% specifies
a reflection with a large specular highlight.
- Metal
- The contribution of the layer color to the color of the specular
highlight. 100% specifies that the highlight color is the color
of the layer. For example, with a Metal value of 100%, an image
of a gold ring reflects golden light. 0% specifies that the color
of the specular highlight is the color of the light source. For example,
a layer with a Metal value of 0% under a white light has a white highlight.
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