Differential D8091 Diff 26167 intern/cycles/util/util_sky_nishita.cpp

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void nishita_skymodel_precompute_texture(float *pixels,

/* calculate texture pixels */

float spectrum[num_wavelengths];

int half_width = width / 2;

float3 cam_pos = make_float3(0, 0, earth_radius + altitude);

float3 sun_dir = geographical_to_direction(sun_elevation, 0.0f);

float latitude_step = M_PI_2_F / height;

float longitude_step = M_2PI_F / width;

float half_lat_step = latitude_step / 2.0f;

for (int y = start_y; y < end_y; y++) {

float latitude = latitude_step * y;

float latitude = (M_PI_2_F + half_lat_step) * powf((float)y / height, 2.0f);

lukasstockner97Unsubmitted

Done

/* sample more pixels toward the horizon */

- float latitude = (M_PI_2_F + half_lat_step) * powf((float)y / height, 2.0f);

+ float latitude = (M_PI_2_F + half_lat_step) * sqr((float)y / height);

float *pixel_row = pixels + (y * width * stride);

As above, please prefer sqr() over pow() here.

lukasstockner97: As above, please prefer sqr() over pow() here.

float *pixel_row = pixels + (y * width) * stride;

for (int x = 0; x < half_width; x++) {

float longitude = longitude_step * x - M_PI_F;

float3 dir = geographical_to_direction(latitude, longitude);

single_scattering(dir, sun_dir, cam_pos, air_density, dust_density, ozone_density, spectrum);

float3 xyz = spec_to_xyz(spectrum);