Brass material

Rolled brass metal material with ray traced or environment mapped reflections.

This metallic material simulates a rolled brass. There is an option for mapping the specular color. There are options for both ray traced or environment mapped reflections, as well as an option for masking the reflections.

Parameters

Surface

Ambient Intensity	A multiplier for the ambient contribution to the material. The ambient lighting model only looks at the ambient lights in the scene. If there are no ambient light, this slider will have no affect.
Lambert Intensity	A multiplier for the diffuse contribution to the material. Traditionally metal shaders have very little diffuse, so this value should be low. Most of the color comes from the specular and/or the reflections.
Use Base Color	If this box is not checked, the Base Color is ignored. Defaults to on. If Use Base Color, Use Point Color and Use Color Map are all off, the surface color will be white.
Base Color	This is the main surface color for the material. Defaults to white.
Use Point Color	If this box is checked, the point color, (Cd), if defined, is multiplied with the Base Color. Defaults to on. If Use Base Color, Use Point Color and Use Color Map are all off, the surface color will be white.
Opacity	The opacity color for this material.

Color Map

Use Color Map	If this box is checked the Base Color is multiplied by the specified texture map. Defaults to off. If Use Base Color, Use Point Color and Use Color Map are all off, the surface color will be white.
Base Color Map	This the name of the texture file. The icon to the right opens a file browser.
Color Map Wrap	Determines what the texture looks like when the texture coordinates are larger or less than 0 to 1. The options are: Repeat means the texture will repeat (tile). Streak means the texture color at the edges is clamped and streaks outside the map. Decal sets the color outside the texture map to the Border Color. See texture for more information.
Color Map Filter	Type of anti-aliasing filter used. See texture for more information.
Color Map Width	The filter width is the number of pixels used by the filter, in both u and v directions. See texture for more information.
Color Map Border	The color used when Decal wrapping is selected.

Specular

Specular Intensity	A multiplier for the specular contribution to the material.
Specular Color	The specular highlight color. Traditionally metal shaders have the same color for the specular highlight as the Base Color, maybe a little less saturated.
U Roughness	This value controls the size or spread of the specular highlight. When Anisotropic is selected, this value controls the specular highlight in only the U direction
V Roughness	When Anisotropic is selected, this value controls the specular highlight in only the V direction It is ignored with any other specular function.
Sharpness	This value controls the sharpness of the edge of the specular highlight. It is used only if Glossy specular is selected
Specular Type	A selector for the specular function. Anisotropic is tpyically used for metals to get the elliptical highlight common to metals. See specular for more information.

Specular Map

Use Specular Map	If this box is checked, the specular color is multiplied by the texture in Specular Map. Defaults to off.
Specular Map	This the name of the texture file. The icon to the right opens a file browser.
Spec Map Wrap	Determines what the texture looks like when the texture coordinates are larger or less than 0 to 1. The options are: Repeat means the texture will repeat (tile). Streak means the texture color at the edges is clamped and streaks outside the map. Decal sets the color outside the texture map to the Border Color. See texture for more information.
Spec Map Filter	Type of anti-aliasing filter used. See texture for more information.
Spec Map Width	The filter width is the number of pixels used by the filter, in both u and v directions. See texture for more information.
Spec Map Border	The color used when Decal wrapping is selected. See texture for more information.

Reflections

Reflection Intensity	A multiplier to lower or brighten the reflections' contribution to the material.
Reflection Color	The tint for the reflections. Traditionally the reflections in metal shaders are tinted with the same color as the Base Color.

Ray Trace

Use Ray Trace	If this box is checked, ray tracing is used to calculate the reflection contribution. Defaults to on.
Use Index of Refraction	If this box is checked, the index of refection is taken in account in the ray tracing calculation. Defaults to on.
Index of Refraction	This value is the ratio of the speed of light in one medium, such as air, to that of another medium. This determines how much the ray bends as it passes from air into another material. Higher values tend to "push" the reflections towards the edges.
Ray Bias	This is typically a small number used to help solve self-intersection issues.
Jitter Amount	This is a value between 0, no jitter and 1, maximum jitter. It controls how randomly the samples are distributed.
Cone Angle	The size of the cone (in radians) over which samples are distributed.
Samples	The number samples to calculate. The more samples, the better the quality, the slower the render.
Background Color	This color is returned when the ray does not hit anything and there is no environment map specified.

Environment Map

Environment Map	If there is the path to a texture here and ray trace is turned off, then this map is used to calculate the reflection contribution. If ray trace is on and there is a texture, then the texture color is returned, when the ray does not hit anything. It is recommended to have a texture path in this slot. The background image as a texture is a good choice to start.
Env Map Wrap	Determines what the texture looks like when the texture coordinates are larger or less than 0 to 1. The options are: Repeat means the texture will repeat (tile). Streak means the texture color at the edges is clamped and streaks outside the map. Decal sets the color outside the texture map to the Border Color. See envmap for more information.
Env Map Filter	Type of anti-aliasing filter used. See envmap for more information.
Env Map Width	The filter width is the number of pixels used by the filter, in both u and v directions. See envmap for more information.
Env Map Border	The color used when Decal wrapping is selected. See envmap for more information.
Env Map Space	The reflection ray used to do the look up in the map is transformed into this space. See envmap for more information.
Use Faux Fresnel	If the box is checked, normal falloff is used to give an inexpensive Fresnel effect to environment mapped reflections.
Faux Fresnel Bias	At 1 the reflections become stronger towards the edges linearly. For values greater than 1, the reflections are pushed out towards the edges. For values less than 1, the reflection are less visible in the middle. Zero (0) will have no affect.

Reflection Mask

Use Reflection Mask	If this box is checked, the reflection intensity is multiplied by the selected channel of the in Reflection Mask. Defaults to off.
Reflection Mask	This the name of the texture file. The icon to the right opens a file browser.
Refl Mask Channel	Picks which channel of the texture is used for the mask. This allows using the one map for 3 masks. The default is lum which uses the luminance of all the channels in the texture as the mask.
Refl Mask Wrap	Determines what the texture looks like when the texture coordinates are larger or less than 0 to 1. The options are: Repeat means the texture will repeat (tile). Streak means the texture color at the edges is clamped and streaks outside the map. Decal sets the color outside the texture map to the Border Color. See texture for more information.
Refl Mask Filter	Type of anti-aliasing filter used. See texture for more information.
Refl Mask Width	The filter width is the number of pixels used by the filter, in both u and v directions. See texture for more information.
Refl Mask Border	The color used when Decal wrapping is selected.

Properties

Reflect Limit

This limits the number of bounces for a reflection ray. Larger numbers equal longer rendering time and may not improve the images. See render properties for more information.