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SL-12978 & SL-13743. Remove abrupt changes in sun intensity calc, preserve original fall-off. 

Had to find a balance in the sunlight intensity calculation that behaves correctly for
both these issues.
meow-7.2.2
Dave Houlton 2020-09-02 11:33:40 -06:00
parent a027e8d481
commit 267e8fd9a3
1 changed files with 3 additions and 3 deletions
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6
indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
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@ -65,9 +65,9 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
vec4 blue_weight = blue_density / combined_haze;
vec4 haze_weight = vec4(haze_density) / combined_haze;
//(TERRAIN) compute sunlight from lightnorm z component, roughly cosine(sun elevation) (for short rays like terrain)
float above_horizon_angle = abs(lightnorm.z);
sunlight *= exp(-light_atten * above_horizon_angle); // for atten and angle in [0..1], this maps to something like [0.3..1]
//(TERRAIN) compute sunlight from lightnorm y component. Factor is roughly cosecant(sun elevation) (for short rays like terrain)
float above_horizon_factor = 1.0 / max(1e-6, lightnorm.y);
sunlight *= exp(-light_atten * above_horizon_factor); // for sun [horizon..overhead] this maps to an exp curve [0..1]
// main atmospheric scattering line integral
float density_dist = rel_pos_len * density_multiplier;