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Use lower shadow normal bias for distant directional shadow splits

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This reduces the visual discrepancy between shadow splits when
Normal Bias is greater than 0. Shadow acne at a distance may
be slightly more present, but if the bias and normal bias values are
tuned to avoid acne up close, acne will usually not be present in
distant splits.
This commit is contained in:
Hugo Locurcio 2024-12-13 16:20:16 +01:00
parent 1b7b009674
commit dfc05caf06
1 changed files with 3 additions and 1 deletions
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4
servers/rendering/renderer_rd/storage_rd/light_storage.cpp
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@ -714,7 +714,9 @@ void LightStorage::update_light_buffers(RenderDataRD *p_render_data, const Paged
light_data.shadow_split_offsets[j] = split;
float bias_scale = light_instance->shadow_transform[j].bias_scale * light_data.soft_shadow_scale;
light_data.shadow_bias[j] = light->param[RS::LIGHT_PARAM_SHADOW_BIAS] / 100.0 * bias_scale;
light_data.shadow_normal_bias[j] = light->param[RS::LIGHT_PARAM_SHADOW_NORMAL_BIAS] * light_instance->shadow_transform[j].shadow_texel_size;
// Use lower shadow normal bias for distant splits, relative to the share taken by the split.
// This helps reduce peter-panning at a distance.
light_data.shadow_normal_bias[j] = light->param[RS::LIGHT_PARAM_SHADOW_NORMAL_BIAS] * light_instance->shadow_transform[j].shadow_texel_size * light_data.shadow_split_offsets[0] / split;
light_data.shadow_transmittance_bias[j] = light->param[RS::LIGHT_PARAM_TRANSMITTANCE_BIAS] / 100.0 * bias_scale;
light_data.shadow_z_range[j] = light_instance->shadow_transform[j].farplane;
light_data.shadow_range_begin[j] = light_instance->shadow_transform[j].range_begin;