3D layers have Material Options properties, which determine how a 3D layer interacts with light and shadow.

只有3d圖層才有材質選項，它決定了3d層如何與燈光和陰影相互作用

Casts Shadows 投影

?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.

指定圖層是否將投影投射于其他圖層上。投影的方向和角度取決于燈光的方向和角度。如果你希望圖層不可見但仍然投射陰影，請將“set cast shadows”屬性設置為“only”

Light Transmission 透光率

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.

光透過圖層的百分比即為透光率，將圖層的顏色投射于其他圖層上作為陰影。0表示沒有光透過圖層，投射黑色陰影。100表示將投影圖層中所有的色值投射到接受陰影的圖層上。

Accepts Shadows 接受陰影

Specifies whether the layer shows shadows cast on it by other layers. In After Effects CS6, an “Only” option is available in Accepts Shadows for when you want to render only a shadow on a layer.

指定圖層是否顯示來自于其他圖層的投影。在cs6版本中，可以選擇only來實現圖層僅渲染陰影。

Accepts Lights 接受燈光

Specifies whether the color of a layer is affected by light that reaches it. This setting does not affect shadows.

指定圖層中的顏色是否受到燈光的影響，該選項不會影響陰影。

Ambient 環境

Ambient (nondirectional) reflectivity of the layer. 100% specifies the most reflectivity; 0% specifies no ambient reflectivity.

圖層的環境反射率。100%表示最大反射率，0表示沒有環境反射。

Diffuse 漫射

?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.

圖層的慢反射率。將漫反射應用到圖層上相當于將一個暗色的塑料片鋪到圖層上。該圖層上的光照會向各方向均勻反射。100%表示最大反射率，0表示沒有漫反射。

Specular 鏡面

?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.

圖層的鏡面反射率。從圖層反射鏡面光就像從鏡子中反射一樣。100%表示最大反射率。0代表沒有反射。

Shininess 發光度

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.

決定鏡面高光的尺寸。該數值僅在鏡面參數大于0的情況下才會生效。100%表示反射產生一個較小的鏡面高光。0表示產生一個較大的鏡面高光。

Metal 金屬

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.

圖層顏色對鏡面高光所產生的影響程度。100%表示高光顏色為圖層顏色。例如metal值為100%，一張金色戒指會反射出金色的光。0代表鏡面高光的顏色為光源顏色。例如，一張位于白色燈光下metal值為0的圖層會產生白色的高光。