R2LightSpherical.h File Reference

Functions and types related to spherical lighting. More...

#include "R2LightPositional.h"

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Functions
vec3	R2_lightSphericalDiffuseLambertTerm (const R2_light_positional_t light, const R2_light_positional_vectors_t v)
vec3	R2_lightSphericalSpecularPhongTerm (const R2_light_positional_t light, const R2_light_positional_vectors_t v, const vec3 specular_color, const float specular_exponent)
vec3	R2_lightSphericalSpecularBlinnPhongTerm (const R2_light_positional_t light, const R2_light_positional_vectors_t v, const vec3 specular_color, const float specular_exponent)

Detailed Description

Functions and types related to spherical lighting.

Definition in file R2LightSpherical.h.

Function Documentation

R2_lightSphericalDiffuseLambertTerm()

vec3 R2_lightSphericalDiffuseLambertTerm	(	const R2_light_positional_t	light,
		const R2_light_positional_vectors_t	v
	)

Calculate the Lambert diffuse term for a spherical light.

Parameters

light	The light parameters
v	The calculated light vectors

Returns

The diffuse term

Definition at line 17 of file R2LightSpherical.h.

{
  float factor = max (0.0, dot (v.surface_to_light, v.normal));
  return (light.color * light.intensity) * factor;
}

R2_lightSphericalSpecularBlinnPhongTerm()

vec3 R2_lightSphericalSpecularBlinnPhongTerm	(	const R2_light_positional_t	light,
		const R2_light_positional_vectors_t	v,
		const vec3	specular_color,
		const float	specular_exponent
	)

Calculate the specular Blinn-Phong term for a spherical light

Parameters

light	The light parameters
v	The calculated light vectors
specular_color	The surface specular color
specular_exponent	The surface specular exponent

Returns

The specular term

Definition at line 62 of file R2LightSpherical.h.

{
  vec3 half_v =
    normalize ((-v.observer_to_surface) + v.surface_to_light);
  float base_factor =
    max (0.0, dot (v.normal, half_v));
  float factor =
    pow (base_factor, specular_exponent);
  vec3 color =
    (light.color * light.intensity) * factor;
  return color * specular_color;
}

R2_lightSphericalSpecularPhongTerm()

vec3 R2_lightSphericalSpecularPhongTerm	(	const R2_light_positional_t	light,
		const R2_light_positional_vectors_t	v,
		const vec3	specular_color,
		const float	specular_exponent
	)

Calculate the specular Phong term for a spherical light

Parameters

light	The light parameters
v	The calculated light vectors
specular_color	The surface specular color
specular_exponent	The surface specular exponent

Returns

The specular term

Definition at line 35 of file R2LightSpherical.h.

{
  vec3 reflection =
    reflect (v.observer_to_surface, v.normal);
  float base_factor =
    max (0.0, dot (reflection, v.surface_to_light));
  float factor =
    pow (base_factor, specular_exponent);
  vec3 color =
    (light.color * light.intensity) * factor;
  return color * specular_color;
}