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#version 110
#define INTENSITY_CORRECTION 0.6
const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
#define LIGHT_TOP_DIFFUSE (0.8 * INTENSITY_CORRECTION)
#define LIGHT_TOP_SPECULAR (0.125 * INTENSITY_CORRECTION)
#define LIGHT_TOP_SHININESS 20.0
const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
#define LIGHT_FRONT_DIFFUSE (0.3 * INTENSITY_CORRECTION)
//#define LIGHT_FRONT_SPECULAR (0.0 * INTENSITY_CORRECTION)
//#define LIGHT_FRONT_SHININESS 5.0
#define INTENSITY_AMBIENT 0.3
uniform mat4 volume_world_matrix;
uniform float object_max_z;
// x = tainted, y = specular;
varying vec2 intensity;
varying float object_z;
void main()
{
// First transform the normal into camera space and normalize the result.
vec3 normal = normalize(gl_NormalMatrix * gl_Normal);
// Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
// Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
float NdotL = max(dot(normal, LIGHT_TOP_DIR), 0.0);
intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
vec3 position = (gl_ModelViewMatrix * gl_Vertex).xyz;
intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position), reflect(-LIGHT_TOP_DIR, normal)), 0.0), LIGHT_TOP_SHININESS);
// Perform the same lighting calculation for the 2nd light source (no specular)
NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
// Scaled to widths of the Z texture.
if (object_max_z > 0.0)
// when rendering the overlay
object_z = object_max_z * gl_MultiTexCoord0.y;
else
// when rendering the volumes
object_z = (volume_world_matrix * gl_Vertex).z;
gl_Position = ftransform();
}
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