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feat(ugc): denoise=oidn traces icons' occlusion per pixel and denoises it (optional build)

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Intel Open Image Denoise 2 (Apache-2.0) behind the CMake option DLU_OIDN (off):
an installed OIDN is used when found, else Intel's release package (pinned by
hash) is downloaded and its libraries copied next to the servers.

A denoiser only removes noise that differs from pixel to pixel; the icons'
occlusion comes from the bake, per vertex, which it leaves as it is (checked:
white noise 0.17 -> 0.006 relative spread, per-vertex blocks unchanged). So
with denoise=oidn a model's icon is drawn from model.noao.nif (its colors
before the bake) with its occlusion traced per pixel of the supersampled image
(denoise_samples rays, default 4, with the bake's distance and strength and the
ray backend), box filtered and denoised at the icon's size, guided by the colors
and normals. The model keeps its baked occlusion. Icons drawn again from stored
files use the stored model.noao.nif the same way.

OIDN works on a thread of its own; its time is charged to the job's thread
(UgcThrottle::Charge), so the CPU budget and the recorded CPU time include it.

Check: configure with -DDLU_OIDN=ON; UgcServer --make-model x.lxfml out oidn
and compare its icon.png with one made with off; an OFF build leaves icons as
they were.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-29 11:43:26 -05:00
parent 1700b7e2e3
commit 2e2e8153e2
13 changed files with 346 additions and 37 deletions
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45
tests/dUgcTests/UgcTests.cpp
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@@ -2111,6 +2111,51 @@ TEST(UgcProcessOptions, ParseApplyAndRecord) {
EXPECT_EQ(stats["settings"]["denoise"], made.denoise);
}
TEST(UgcRender, DenoisedIconsTraceTheOcclusionPerPixel) {
// A box standing on a floor, grey: denoised, the icon is drawn from the model before its bake with the occlusion
// traced per pixel, so the floor is darker by the box than away from it; with few rays it is about what many give
UgcModel::Model model;
AddBox(model.opaque, glm::vec3(-4.0f, -0.2f, -4.0f), glm::vec3(4.0f, 0.0f, 4.0f));
AddBox(model.opaque, glm::vec3(-0.5f, 0.0f, -0.5f), glm::vec3(0.5f, 1.0f, 0.5f));
UgcRender::IconOptions options;
options.size = 48;
options.supersample = 2;
options.pitchDegrees = 60.0f;
options.shadows = 0.0f;
options.ao.distance = 2.0f;
const auto normal = UgcRender::RenderIcon(model, options);
options.denoise = UgcRender::eDenoise::OIDN;
options.denoiseSamples = 2;
const auto few = UgcRender::RenderIcon(model, options, nullptr, &model);
if (!UgcRender::Available(UgcRender::eDenoise::OIDN)) {
EXPECT_EQ(few.rgba, normal.rgba); // without it the option does nothing
GTEST_SKIP() << "built without Open Image Denoise (DLU_OIDN)";
}
options.denoiseSamples = 64;
const auto many = UgcRender::RenderIcon(model, options, nullptr, &model);
ASSERT_EQ(few.rgba.size(), normal.rgba.size());
double difference = 0.0, count = 0.0;
for (size_t i = 0; i < few.rgba.size(); i += 4) {
ASSERT_EQ(few.rgba[i + 3], normal.rgba[i + 3]) << i; // the same outline
if (few.rgba[i + 3] != 255) continue;
difference += std::abs(static_cast<double>(few.rgba[i]) - many.rgba[i]);
count++;
}
EXPECT_LT(difference / count, 4.0);
// Darker than the icon without occlusion only by the box (near the middle), not out at the floor's edges
size_t darkened = 0, darkenedFar = 0;
for (int y = 0; y < 48; y++) {
for (int x = 0; x < 48; x++) {
const size_t i = (static_cast<size_t>(y) * 48 + x) * 4;
if (few.rgba[i + 3] != 255 || few.rgba[i] + 30 > normal.rgba[i]) continue;
darkened++;
if (std::abs(x - 24) > 14 || std::abs(y - 24) > 14) darkenedFar++;
}
}
EXPECT_GT(darkened, 20u);
EXPECT_EQ(darkenedFar, 0u);
}
TEST(UgcRays, NamesAndFallback) {
for (const auto backend : { UgcRays::eBackend::BUILTIN, UgcRays::eBackend::EMBREE, UgcRays::eBackend::HIPRT }) {
EXPECT_EQ(UgcRays::Parse(UgcRays::Name(backend)), backend);