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Differential D8091 Diff 26167 intern/cycles/kernel/shaders/node_sky_texture.osl

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intern/cycles/kernel/shaders/node_sky_texture.osl

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} }
/* Nishita improved */ /* Nishita improved */
vector geographical_to_direction(float lat, float lon) vector geographical_to_direction(float lat, float lon)
{ {
return vector(cos(lat) * cos(lon), cos(lat) * sin(lon), sin(lat)); return vector(cos(lat) * cos(lon), cos(lat) * sin(lon), sin(lat));
} }
color sky_radiance_nishita(vector dir, float nishita_data[9], string filename) color sky_radiance_nishita(vector dir, float nishita_data[10], string filename)
{ {
/* definitions */ /* definitions */
float sun_elevation = nishita_data[6]; float sun_elevation = nishita_data[6];
float sun_rotation = nishita_data[7]; float sun_rotation = nishita_data[7];
float angular_diameter = nishita_data[8]; float angular_diameter = nishita_data[8];
float sun_intensity = nishita_data[9];
int sun_disc = angular_diameter > 0; int sun_disc = angular_diameter > 0;
float alpha = 1.0; float alpha = 1.0;
color xyz; color xyz;
/* convert dir to spherical coordinates */ /* convert dir to spherical coordinates */
vector direction = sky_spherical_coordinates(dir); vector direction = sky_spherical_coordinates(dir);
/* render above the horizon */ /* render above the horizon */
if (dir[2] >= 0.0) { if (dir[2] >= 0.0) {
/* definitions */ /* definitions */
vector sun_dir = geographical_to_direction(sun_elevation, sun_rotation + M_PI_2); vector sun_dir = geographical_to_direction(sun_elevation, sun_rotation + M_PI_2);
float sun_dir_angle = acos(dot(dir, sun_dir)); float sun_dir_angle = acos(dot(dir, sun_dir));
float half_angular = angular_diameter / 2.0; float half_angular = angular_diameter / 2.0;
float dir_elevation = M_PI_2 - direction[0]; float dir_elevation = M_PI_2 - direction[0];
/* if ray inside sun disc render it, otherwise render sky */ /* if ray inside sun disc render it, otherwise render sky */
if (sun_dir_angle < half_angular && sun_disc == 1) { if (sun_dir_angle < half_angular && sun_disc == 1) {
/* get 3 pixels data */ /* get 2 pixels data */
color pixel_bottom = color(nishita_data[0], nishita_data[1], nishita_data[2]); color pixel_bottom = color(nishita_data[0], nishita_data[1], nishita_data[2]);
color pixel_top = color(nishita_data[3], nishita_data[4], nishita_data[5]); color pixel_top = color(nishita_data[3], nishita_data[4], nishita_data[5]);
float y; float y;
/* sun interpolation */ /* sun interpolation */
if (sun_elevation - half_angular > 0.0) { if (sun_elevation - half_angular > 0.0) {
if ((sun_elevation + half_angular) > 0.0) { if ((sun_elevation + half_angular) > 0.0) {
y = ((dir_elevation - sun_elevation) / angular_diameter) + 0.5; y = ((dir_elevation - sun_elevation) / angular_diameter) + 0.5;
xyz = mix(pixel_bottom, pixel_top, y); xyz = mix(pixel_bottom, pixel_top, y) * sun_intensity;
} }
} }
else { else {
if (sun_elevation + half_angular > 0.0) { if (sun_elevation + half_angular > 0.0) {
y = dir_elevation / (sun_elevation + half_angular); y = dir_elevation / (sun_elevation + half_angular);
xyz = mix(pixel_bottom, pixel_top, y); xyz = mix(pixel_bottom, pixel_top, y) * sun_intensity;
} }
} }
/* limb darkening, coefficient is 0.6f */ /* limb darkening, coefficient is 0.6f */
float angle_fraction = sun_dir_angle / half_angular; float angle_fraction = sun_dir_angle / half_angular;
float limb_darkening = (1.0 - 0.6 * (1.0 - sqrt(1.0 - angle_fraction * angle_fraction))); float limb_darkening = (1.0 - 0.6 * (1.0 - sqrt(1.0 - angle_fraction * angle_fraction)));
xyz *= limb_darkening; xyz *= limb_darkening;
} }
/* sky */ /* sky */
else { else {
/* sky interpolation */ /* sky interpolation */
float x = (direction[1] + M_PI + sun_rotation) / M_2PI; float x = (direction[1] + M_PI + sun_rotation) / M_2PI;
float y = 1.0 - (dir_elevation / M_PI_2); float y = 1.0 - pow((dir_elevation / M_PI_2), 0.5);
if (x > 1.0) { if (x > 1.0) {
lukasstockner97Unsubmitted
Done
Inline Actions
/* more pixels toward horizon compensation */
- float y = 1.0 - pow((dir_elevation / M_PI_2), 0.5);
+ float y = 1.0 - sqrt(dir_elevation / M_PI_2);
if (x > 1.0) {

Please use sqrt() here, pow() is very expensive so we should avoid it if possible.

lukasstockner97: Please use sqrt() here, pow() is very expensive so we should avoid it if possible.
x = x - 1.0; x = x - 1.0;
} }
xyz = (color)texture(filename, x, y, "wrap", "clamp", "interp", "linear", "alpha", alpha); xyz = (color)texture(filename, x, y, "wrap", "clamp", "interp", "linear", "alpha", alpha);
} }
} }
/* ground */ /* ground */
else { else {
if (dir[2] < -0.4) { if (dir[2] < -0.4) {
Show All 23 Linesshader node_sky_texture(int use_mapping = 0,
string type = "hosek_wilkie", string type = "hosek_wilkie",
float theta = 0.0, float theta = 0.0,
float phi = 0.0, float phi = 0.0,
string filename = "", string filename = "",
color radiance = color(0.0, 0.0, 0.0), color radiance = color(0.0, 0.0, 0.0),
float config_x[9] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}, float config_x[9] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
float config_y[9] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}, float config_y[9] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
float config_z[9] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}, float config_z[9] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
float nishita_data[9] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}, float nishita_data[10] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
output color Color = color(0.0, 0.0, 0.0)) output color Color = color(0.0, 0.0, 0.0))
{ {
vector p = Vector; vector p = Vector;
if (use_mapping) if (use_mapping)
p = transform(mapping, p); p = transform(mapping, p);
if (type == "nishita_improved") if (type == "nishita_improved")
Color = sky_radiance_nishita(p, nishita_data, filename); Color = sky_radiance_nishita(p, nishita_data, filename);
if (type == "hosek_wilkie") if (type == "hosek_wilkie")
Color = sky_radiance_hosek(p, phi, theta, radiance, config_x, config_y, config_z); Color = sky_radiance_hosek(p, phi, theta, radiance, config_x, config_y, config_z);
if (type == "preetham") if (type == "preetham")
Color = sky_radiance_preetham(p, phi, theta, radiance, config_x, config_y, config_z); Color = sky_radiance_preetham(p, phi, theta, radiance, config_x, config_y, config_z);
} }