diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_sky_texture.osl')
| -rw-r--r-- | intern/cycles/kernel/shaders/node_sky_texture.osl | 123 |
1 files changed, 106 insertions, 17 deletions
diff --git a/intern/cycles/kernel/shaders/node_sky_texture.osl b/intern/cycles/kernel/shaders/node_sky_texture.osl index 4def237a2e0..08bc8f85120 100644 --- a/intern/cycles/kernel/shaders/node_sky_texture.osl +++ b/intern/cycles/kernel/shaders/node_sky_texture.osl @@ -44,13 +44,13 @@ float sky_perez_function(float lam[9], float theta, float gamma) (1.0 + lam[2] * exp(lam[3] * gamma) + lam[4] * cgamma * cgamma); } -color sky_radiance_old(normal dir, - float sunphi, - float suntheta, - color radiance, - float config_x[9], - float config_y[9], - float config_z[9]) +color sky_radiance_preetham(normal dir, + float sunphi, + float suntheta, + color radiance, + float config_x[9], + float config_y[9], + float config_z[9]) { /* convert vector to spherical coordinates */ vector spherical = sky_spherical_coordinates(dir); @@ -88,13 +88,13 @@ float sky_radiance_internal(float config[9], float theta, float gamma) (config[2] + config[3] * expM + config[5] * rayM + config[6] * mieM + config[7] * zenith); } -color sky_radiance_new(normal dir, - float sunphi, - float suntheta, - color radiance, - float config_x[9], - float config_y[9], - float config_z[9]) +color sky_radiance_hosek(normal dir, + float sunphi, + float suntheta, + color radiance, + float config_x[9], + float config_y[9], + float config_z[9]) { /* convert vector to spherical coordinates */ vector spherical = sky_spherical_coordinates(dir); @@ -116,16 +116,103 @@ color sky_radiance_new(normal dir, return xyz_to_rgb(x, y, z) * (M_2PI / 683); } +/* Nishita improved */ +vector geographical_to_direction(float lat, float lon) +{ + return vector(cos(lat) * cos(lon), cos(lat) * sin(lon), sin(lat)); +} + +color sky_radiance_nishita(vector dir, float nishita_data[9], string filename) +{ + /* definitions */ + float sun_elevation = nishita_data[6]; + float sun_rotation = nishita_data[7]; + float angular_diameter = nishita_data[8]; + int sun_disc = angular_diameter > 0; + float alpha = 1.0; + color xyz; + /* convert dir to spherical coordinates */ + vector direction = sky_spherical_coordinates(dir); + + /* render above the horizon */ + if (dir[2] >= 0.0) { + /* definitions */ + vector sun_dir = geographical_to_direction(sun_elevation, sun_rotation + M_PI_2); + float sun_dir_angle = acos(dot(dir, sun_dir)); + float half_angular = angular_diameter / 2.0; + float dir_elevation = M_PI_2 - direction[0]; + + /* if ray inside sun disc render it, otherwise render sky */ + if (sun_dir_angle < half_angular && sun_disc == 1) { + /* get 3 pixels data */ + 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]); + float y; + + /* sun interpolation */ + if (sun_elevation - half_angular > 0.0) { + if ((sun_elevation + half_angular) > 0.0) { + y = ((dir_elevation - sun_elevation) / angular_diameter) + 0.5; + xyz = mix(pixel_bottom, pixel_top, y); + } + } + else { + if (sun_elevation + half_angular > 0.0) { + y = dir_elevation / (sun_elevation + half_angular); + xyz = mix(pixel_bottom, pixel_top, y); + } + } + /* limb darkening, coefficient is 0.6f */ + float angle_fraction = sun_dir_angle / half_angular; + float limb_darkening = (1.0 - 0.6 * (1.0 - sqrt(1.0 - angle_fraction * angle_fraction))); + xyz *= limb_darkening; + } + /* sky */ + else { + /* sky interpolation */ + float x = (direction[1] + M_PI + sun_rotation) / M_2PI; + float y = 1.0 - (dir_elevation / M_PI_2); + if (x > 1.0) { + x = x - 1.0; + } + xyz = (color)texture(filename, x, y, "wrap", "clamp", "interp", "linear", "alpha", alpha); + } + } + /* ground */ + else { + if (dir[2] < -0.4) { + xyz = color(0, 0, 0); + } + else { + /* black ground fade */ + float mul = pow(1.0 + dir[2] * 2.5, 3.0); + /* interpolation */ + float x = (direction[1] + M_PI + sun_rotation) / M_2PI; + float y = 1.5; + if (x > 1.0) { + x = x - 1.0; + } + xyz = (color)texture( + filename, x, y, "wrap", "periodic", "interp", "linear", "alpha", alpha) * + mul; + } + } + /* convert to RGB and adjust strength */ + return xyz_to_rgb(xyz[0], xyz[1], xyz[2]) * 120000.0; +} + shader node_sky_texture(int use_mapping = 0, matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), vector Vector = P, string type = "hosek_wilkie", float theta = 0.0, float phi = 0.0, + string filename = "", 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_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 nishita_data[9] = {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)) { vector p = Vector; @@ -133,8 +220,10 @@ shader node_sky_texture(int use_mapping = 0, if (use_mapping) p = transform(mapping, p); + if (type == "nishita_improved") + Color = sky_radiance_nishita(p, nishita_data, filename); if (type == "hosek_wilkie") - Color = sky_radiance_new(p, phi, theta, radiance, config_x, config_y, config_z); - else - Color = sky_radiance_old(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") + Color = sky_radiance_preetham(p, phi, theta, radiance, config_x, config_y, config_z); } |