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EEVEE-Next: Shadow: Avoid transmission shadow to go behind light

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This avoid missing tiles if light is inside the object radius.
This commit is contained in:
Clément Foucault
2024-05-28 19:43:08 +02:00
parent 33a5b47735
commit 7d533175f2
1 changed files with 10 additions and 4 deletions
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14
source/blender/draw/engines/eevee_next/shaders/eevee_shadow_tracing_lib.glsl
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@@ -429,11 +429,17 @@ float shadow_eval(LightData light,
vec2 random_pcf_2d = vec2(0.0);
#endif
float distance_to_shadow;
/* Direction towards the shadow center (punctual) or direction (direction).
* Not the same as the light vector if the shadow is jittered. */
vec3 L = is_directional ? light_z_axis(light) :
normalize(light_position_get(light) +
light_local_data_get(light).shadow_position - P);
vec3 L;
if (is_directional) {
L = light_z_axis(light);
}
else {
L = light_position_get(light) + light_local_data_get(light).shadow_position - P;
L = normalize_and_get_length(L, distance_to_shadow);
}
bool is_facing_light = (dot(Ng, L) > 0.0);
/* Still bias the transmission surfaces towards the light if they are facing away. */
@@ -446,7 +452,7 @@ float shadow_eval(LightData light,
/* Ideally, we should bias using the chosen ray direction. In practice, this conflict with our
* shadow tile usage tagging system as the sampling position becomes heavily shifted from the
* tagging position. This is the same thing happening with missing tiles with large radii. */
P += abs(thickness) * L;
P += abs(is_directional ? thickness : min(thickness, distance_to_shadow - 0.01)) * L;
}
/* Avoid self intersection with respect to numerical precision. */
P = offset_ray(P, N_bias);