Phong

 
 
 

| Illumination | Transparency/Reflection | Indirect Illumination | Render Tree Usage

Category: Illumination

Shader Family: Surface Material

Output: Color

Controls the ambient, diffuse, and specular RGB colors, as well as RGB reflectivity, translucency, and transparency.

Name

The shader's name. Enter any name you like, or leave the default.

Illumination

Diffuse

Enable

Switches on or off the Diffuse illumination component of the shading model.

Color

Defines the Diffuse surface color in the illuminated area of the object. The value is blended with the object's Ambient value.

Ambient

Determines how much the global ambience (indirect illumination) affects the object.

Specular

Enable

Switches on or off the Specular illumination component of the shading model.

Color

Defines the Specular surface color in the illuminated area of the object. The value is blended with the object's Diffuse and Ambient values.

Specular Decay

Defines the rate at which the specularity decays outward.

Transparency/Reflection

Transparency

Enable

Switches on transparency. When off, no transparency is possible on an object.

Mix Color

The Mix color controls are a subset of the Transparency controls. They include the Color, Use Alpha, Invert, and Scale controls.

Color

Defines the material's color transparency.

Black = opaque; white = transparent

Use Alpha

Uses the material's alpha channel, instead of its RGB, channel to control transparency. This is especially useful when you are driving the transparency with an image that has a matte.

Invert

Inverts the color or alpha value that is driving the transparency, depending on whether or not Use Alpha is enabled.

Scale

Adjust this value to adjust the intensity of the transparency. If the Invert option is enabled, the scaling is applied to the inverted value.

Frost

Determines the smoothness of the surface.

0 = glossy; the higher the value the more diffuse, or "frosted," the effect

Samples

Specifies the number of times the light ray is sampled. Low sample rate for a grainy; high for smooth

IOR (Index of Refraction)

Controls the bending of light through a transparent material. Defines the index of refraction, which varies according to the nature of the material. (The refractive index of water is roughly 1.33, and that of vodka is about 1.36.)

Default = 1 (the refractive index of air), which allows light rays to pass through a transparent material without distortion.

Reflection

Enable

Switches on reflection. When off, no reflections are possible on an object.

Mix Color

The Mix color controls are a subset of the Reflection controls. They include the Color, Use Alpha, Invert, and Scale controls.

Color

Determines the blending factor between the illumination of the front and back of the object. The default value of 0 results in no blending.

Use Alpha

Uses the material's alpha channel, instead of its RGB, channel to control reflection. This is especially useful when you are driving the reflection with an image that has a matte.

Invert

Inverts the color or alpha value that is driving the reflection, depending on whether or not Use Alpha is enabled.

Scale

Adjust this value to adjust the intensity of the reflection. If the Invert option is enabled, the scaling is applied to the inverted value.

Gloss

Determines the smoothness of the surface.

0 = glossy; the higher the value the more diffuse, or "frosted," the effect

Samples

Specifies the number of times the light ray is sampled.

Low sample rate for a grainy; high for smooth

Reflection Mode

Raytracing Enable allows rays to reflect off the surface to produce realistic reflections. This option is slower to render than Environment Only, which performs a quick reflection of a scene's environment shader.

Indirect Illumination

Global Illumination / Caustics / Final Gathering

Radiance

Used to control the color and intensity (strength) of the GI/FG/Caustic effect over the object's surface. Also, you can texture this parameter in order to reveal a GI/FG/Caustic effect on a given location on the object.

Translucency

Enable

Switches on translucency. When off, the surface has no translucent qualities.

Translucency

Determines the blending factor between the illumination of the front and back of the object. Default value of 0 gives no blending.

Incandescence

Enable

Switches on incandescence.

Incandescence

The color of light that a material appears to be emitting. Note that incandescent objects do not actually illuminate other objects.

Intensity

Sets the pixel brightness of the incandescence.

Render Tree Usage

This surface shader can be used almost anywhere in a render tree. Although it is most commonly connected directly to a material node's Surface input (as well as Shadow and Photon), you can use any number or combination of surface shaders to control various parts of your effect. Surface shaders are often mixed (as the Base Color using a mixer shader) with textures to add realism to them. Also, you can use textures to control color inputs (such as Diffuse or Ambient) or scalar output nodes (such as gradients or fractals) to control refraction or translucency.