EEVEE-Next: Shadow resolution scale and adaptive filtering #119436
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Reference: blender/blender#119436
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Delete Branch "pragma37/blender:pull-eevee-shadow-resolution-scale"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
Allow the user to scale shadow-map resolution per-light.
Adapt the PCF scale based on shadow-map to pixel footprint ratio, since we can no longer assume that higher LODs don't need filtering.
This allows using much lower shadow resolutions, which can yield quite significant performance improvements, with relatively little perceptual quality loss (at the cost of softening shadow edges).
The per-light resolution scale is a literal scale, so for example 0.5 means half the resolution. The Scene Simplify Shadows setting has been updated to match this behavior.
@blender-bot build +gpu
@ -131,0 +133,4 @@
int shadow_directional_level(LightData light, vec3 lP)
{
int clipmap_lod = int(ceil(shadow_directional_level_fractional(light, lP)));
return clamp(clipmap_lod, light.clipmap_lod_min, light.clipmap_lod_max);
you are clamping twice. I don't think that is necessary.
I did it to workaround possible floating point precision issues causing troubles with the later
ceil
.But maybe I was just overly paranoid.
@ -131,0 +144,4 @@
*/
float shadow_punctual_footprint_ratio(LightData light,
vec3 P,
float perspective_division,
Pass
float dist_to_cam
andbool is_perspective
for clarity.@ -470,0 +478,4 @@
float dist_to_cam = distance(P, drw_view_position());
float perspective_division = 1.0;
if (drw_view_is_perspective()) {
perspective_division = distance(P, drw_view_position());
you are computing
dist_to_cam
again@blender-bot build +gpu
@ -819,2 +819,3 @@
float pcf_radius;
int _pad0;
/* Shadow Map resolution bias. */
float lod_bias;
Then remove
_clipmap_lod_bias
since it is redundant (and would remove some dirty define code).@ -1311,6 +1311,8 @@ void ShadowModule::set_view(View &view, GPUTexture *depth_tx)
pixel_world_radius_ = screen_pixel_radius(view, int2(target_size));
tilemap_projection_ratio_ = tilemap_pixel_radius() / pixel_world_radius_;
data_.tilemap_projection_ratio = tilemap_projection_ratio_;
Do not duplicate data. Remove the private member.
@ -464,3 +464,3 @@
rand = sampling_rng_2D_get(SAMPLING_SHADOW_V);
#endif
vec2 pcf_offset = interlieved_gradient_noise(UTIL_TEXEL, vec2(0.0), rand);
vec2 pcf_offset = interlieved_gradient_noise(UTIL_TEXEL, vec2(5, 7), rand);
This is yielding strong flickering in the noise pattern due to correlation between the 2 random numbers.
Use this instead:
@ -470,0 +481,4 @@
light, P, is_perspective, dist_to_cam, uniform_buf.shadow.tilemap_projection_ratio);
float lod = -log2(footprint_ratio) + light.lod_bias;
lod = clamp(lod, 0.0, float(SHADOW_TILEMAP_LOD));
float pcf_scale = pow(2.0, lod);
Never use
pow(2.0, lod)
. Poor precision and bad perf. Useexp2(lod)
instead.Same for
pow(x, 2.0)
usepow2(x)
.@ -307,0 +307,4 @@
prop = RNA_def_property(srna, "shadow_resolution_scale", PROP_FLOAT, PROP_FACTOR);
RNA_def_property_range(prop, 0.0f, 2.0f);
RNA_def_property_ui_range(prop, 0.0f, 2.0f, 0.25f, 2);
RNA_def_property_ui_text(prop, "Shadow Resolution Scale", "Bias the Shadow Map resolution");
This needs more attention. This can be polished later with the UI team.
However, it should already be stated that:
0
means the lowest possible resolution.1
tries to match screen pixel density.2
is double the resolution.I don't know if it should be mentioned in the tooltip that this is also affected by the simplify option.
I've updated the tooltip to :
I think that kind of covers all your suggestions without being overly wordy, but feel free to suggest an alternative.
Not too sold on using blue noise for the filter offset:
It may improve the per-sample flickering, but the final image looks worse IMO.
If the noise persists at higher sample count (in F12 render) then it's some correlation artifacts. You can try using another layer of the blue noise (the alpha), you can try scrambling the resulting numbers quite more using
noise = fract(noise * 6.1803398875)
(but that doesn't do miracle).But to be honest, in my tests, the code I gave you in the previous comment did yield a noise free result with enough sample. I know it combines 2 RNG offsets and that looks weird but it is worth a try.
If you are only comparing a low amount of samples (<200) then yes, the result can look noisier than IGN since the random numbers are using leaped Halton sequences that has very slow convergence.
Yes, those images were taken at 64 samples IIRC. The blue noise eventually converges, but it needs more samples to look ok.
Take into account that this is essentially an optimization feature.
If lowering render times comes at the cost of heavily increasing the number of samples needed, then there's no point in using it.
I think this is good to go. (after fixing the conflicts obviously)