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3. Browse to the location of and select your image file, then click Open.
4. You may then need to adjust some of the texture parameters of the new material, for example its
scale, rotation, offset or reflection (if it's back to front). These may all be edited in the Texture tab.
See “ Editing Presenter Materials ” for more information on editing materials.
Advanced Materials
Internally a material is defined by four shaders from different classes - Color, Transparency, Reflectance
and Displacement. Each class of shader controls a different aspect of a material's behavior. There are
many types of shader in each class, each type being defined by its own set of parameters.
• A color shader is used to define the color of a surface at any point in space. It may be as simple as a
plain color which specifies all parts of the surface to have a uniform color, or it may define complex
surface patterns such as marble or wood. Every material must have a color shader.
• A transparency shader is used to define how transparent or opaque a surface is, and thus how much
light is able to pass through it. Transparency shaders range from a simple uniform transparency to
more complex regular or irregular eroded patterns that would be more difficult to represent using
modelling techniques. A material without a transparency shader is completely opaque.
• The behavior of a surface in the presence light is represented by a reflectance shader which defines
Presenter Materials
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