diff options
Diffstat (limited to 'source/blender/draw/engines/eevee/eevee_lights.c')
| -rw-r--r-- | source/blender/draw/engines/eevee/eevee_lights.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/source/blender/draw/engines/eevee/eevee_lights.c b/source/blender/draw/engines/eevee/eevee_lights.c index cba86d058ea..e23a5a81169 100644 --- a/source/blender/draw/engines/eevee/eevee_lights.c +++ b/source/blender/draw/engines/eevee/eevee_lights.c @@ -96,7 +96,7 @@ static float light_shape_power_get(const Light *la, const EEVEE_Light *evli) } } else if (ELEM(la->type, LA_SPOT, LA_LOCAL)) { - power = 1.0f / (4.0f * evli->radius * evli->radius * M_PI * M_PI); /* 1/(4*r²*Pi²) */ + power = 1.0f / (4.0f * evli->radius * evli->radius * M_PI * M_PI); /* `1/(4*(r^2)*(Pi^2))` */ /* for point lights (a.k.a radius == 0.0) */ // power = M_PI * M_PI * 0.78; /* XXX : Empirical, Fit cycles power */ @@ -106,7 +106,7 @@ static float light_shape_power_get(const Light *la, const EEVEE_Light *evli) /* Make illumination power closer to cycles for bigger radii. Cycles uses a cos^3 term that we * cannot reproduce so we account for that by scaling the light power. This function is the * result of a rough manual fitting. */ - power += 1.0f / (2.0f * M_PI); /* power *= 1 + r²/2 */ + power += 1.0f / (2.0f * M_PI); /* `power *= 1 + (r^2)/2` */ } return power; } @@ -257,7 +257,7 @@ void EEVEE_lights_cache_finish(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata) float power = max_fff(UNPACK3(evli->color)) * evli->volume; if (power > 0.0f && evli->light_type != LA_SUN) { /* The limit of the power attenuation function when the distance to the light goes to 0 is - * 2 / r² where r is the light radius. We need to find the right radius that emits at most + * `2 / r^2` where r is the light radius. We need to find the right radius that emits at most * the volume light upper bound. Inverting the function we get: */ float min_radius = 1.0f / sqrtf(0.5f * upper_bound / power); /* Square it here to avoid a multiplication inside the shader. */ |