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WIP: lightMapping: blend a bit the normal map with the deluxe map #1906

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WIP: lightMapping: blend a bit the normal map with the deluxe map #1906

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7 changes: 7 additions & 0 deletions src/engine/renderer/glsl_source/lightMapping_fp.glsl
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,13 @@ void main()
// Compute light direction in world space from deluxe map.
vec4 deluxe = texture2D(u_DeluxeMap, var_TexLight);
vec3 lightDir = normalize(2.0 * deluxe.xyz - 1.0);

/* HACK: blend a bit the normal map with the deluxe map to make the normal
map align with the deluxe map to prevent NdotL collapsing to zero, while
retaining enough normal details.
See: https://github.com/DaemonEngine/Daemon/issues/1905 */
float normalBlendFactor = 0.5;
normal = normalize(normal * normalBlendFactor + lightDir * (1.0 - normalBlendFactor));
#elif defined(USE_GRID_DELUXE_MAPPING)
// Compute light direction in world space from light grid.
vec4 texel = texture3D(u_LightGrid2, lightGridPos);
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