From BlenderWiki

Previsualización del Material

Modo: todos los modos

Panel: Contexto Sombreador/Material → Preview

Combinación de teclas: F5

Descripción

El panel de previsualización da una rápida visualización del material activo y de sus propiedades, incluyendo los Sombreadores, Rampas, Transparencias y Reflejos y las Texturas. Proporciona varias formas que son muy útiles para diseñar nuevos sombreadores: para algunos sombreadores (como aquellos basados en colores Rampa o un sombreador difuso como el Minnaert), se necesitan unas determinadas formas para decidir si cumplen con su objetivo inicial.

Options

Flat XY Plane: Useful for previewing textures and materials of flat objects, like walls, papers and such.
Sphere: Useful for previewing textures and materials of sphere-like objects, but also to design metals and other reflective/transparent materials, thanks to the checkered background.
Cube: Useful for previewing textures and materials of cube-like objects, but also to design procedural textures. Features a checkered background.
Monkey: Useful for previewing textures and materials of organic or complex non-primitive shapes. Features a checkered background.
Hair strands: Useful for previewing textures and materials of strand-like objects, like grass, fur, feathers and hair. Features a checkered background.
Large Sphere with Sky: Useful for previewing textures and materials of sphere-like objects, but also to design metals and other reflective materials, thanks to the gradient Sky background.
Preview uses OSA (oversampling): Whatever the preview option, it will make use of OSA (oversampling) in order to provide with a better quality. Disable this option if your computer is already slow or old.