POV-Ray allows you to define identifiers for later use in the scene file. An identifier may be 1 to 40 characters long. It may consist of upper or lower case letters, the digits 0 through 9 or an underscore character ("_"). The first character must be an alphabetic character. The declaration of identifiers is covered later.
POV-Ray has a number of reserved keywords which are listed below.
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abs absorption acos acosh adaptive adc_bailout agate agate_turb all alpha ambient ambient_light angle aperture append arc_angle area_light array asc asin asinh assumed_gamma atan atan2 atanh average background bezier_spline bicubic_patch black_hole blob blue blur_samples bounded_by box boxed bozo break brick brick_size brightness brilliance bumps bump_map bump_size camera case caustics ceil checker chr clipped_by clock clock_delta color color_map colour colour_map component composite concat cone confidence conic_sweep control0 control1 cos cosh count crackle crand cube cubic cubic_spline cubic_wave cylinder cylindrical debug declare default degrees density density_file density_map dents difference diffuse dimensions dimension_size |
direction disc distance distance_maximum div eccentricity else emission end error error_bound exp extinction fade_distance fade_power falloff falloff_angle false fclose file_exists filter finish fisheye flatness flip floor focal_point fog fog_alt fog_offset fog_type fopen frequency gif global_settings gradient granite gray_threshold green height_field hexagon hf_gray_16 hierarchy hollow hypercomplex if ifdef iff ifndef image_map include int interior interpolate intersection intervals inverse ior irid irid_wavelength jitter julia_fractal lambda lathe leopard light_source linear_spline linear_sweep local location log looks_like look_at low_error_factor macro mandel map_type marble material_map matrix max max_intersections max_iteration max_trace_level media media_attenuation media_interaction merge mesh |
metallic min minimum_reuse mod mortar nearest_count no normal normal_map no_shadow number_of_waves object octaves off offset omega omnimax on once onion open orthographic panoramic perspective pgm phase phong phong_size pi pigment pigment_map planar plane png point_at poly polygon poly_wave pot pow ppm precision prism pwr quadratic_spline quadric quartic quaternion quick_color quick_colour quilted radial radians radiosity radius rainbow ramp_wave rand range ratio read reciprocal recursion_limit red reflection reflection_exponent refraction render repeat rgb rgbf rgbft rgbt right ripples rotate roughness samples scale scallop_wave scattering seed shadowless sin sine_wave sinh sky sky_sphere slice |
slope_map smooth smooth_triangle sor specular sphere spherical spiral1 spiral2 spotlight spotted sqr sqrt statistics str strcmp strength strlen strlwr strupr sturm substr superellipsoid switch sys t tan tanh text texture texture_map tga thickness threshold tightness tile2 tiles torus track transform translate transmit triangle triangle_wave true ttf turbulence turb_depth type u ultra_wide_angle undef union up use_color use_colour use_index u_steps v val variance vaxis_rotate vcross vdot version vlength vnormalize vrotate v_steps warning warp water_level waves while width wood wrinkles write x y yes z |
All reserved words are fully lower case. Therefore it is recommended that your identifiers contain at least one upper case character so it is sure to avoid conflict with reserved words.