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Fix POM distortions and add normal map strength slider

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POM fixes: use blurred height only for ray march (keep crisp Sobel for
normals), reduce pomScale 0.03→0.012, clamp grazing angle denominator
to 0.15, hard-limit max UV offset, smooth fadeout at steep view angles.

Add Normal Map Strength slider (0.0-2.0) in Video settings for user
control over surface detail intensity. Persisted across sessions.
This commit is contained in:
Kelsi 2026-02-23 01:18:42 -08:00
parent eaceb58e77
commit bec3190b08
6 changed files with 68 additions and 10 deletions
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30
src/rendering/wmo_renderer.cpp
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@ -601,12 +601,13 @@ bool WMORenderer::loadModel(const pipeline::WMOModel& model, uint32_t id) {
matData.isWindow = mb.isWindow ? 1 : 0;
matData.enableNormalMap = normalMappingEnabled_ ? 1 : 0;
matData.enablePOM = pomEnabled_ ? 1 : 0;
matData.pomScale = 0.03f;
matData.pomScale = 0.012f;
{
static const int pomSampleTable[] = { 16, 32, 64 };
matData.pomMaxSamples = pomSampleTable[std::clamp(pomQuality_, 0, 2)];
}
matData.heightMapVariance = mb.heightMapVariance;
matData.normalMapStrength = normalMapStrength_;
if (matBuf.info.pMappedData) {
memcpy(matBuf.info.pMappedData, &matData, sizeof(matData));
}
@ -1228,9 +1229,10 @@ void WMORenderer::render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet, const
auto* ubo = reinterpret_cast<WMOMaterialUBO*>(allocInfo.pMappedData);
ubo->enableNormalMap = normalMappingEnabled_ ? 1 : 0;
ubo->enablePOM = pomEnabled_ ? 1 : 0;
ubo->pomScale = 0.03f;
ubo->pomScale = 0.012f;
ubo->pomMaxSamples = maxSamples;
ubo->heightMapVariance = mb.heightMapVariance;
ubo->normalMapStrength = normalMapStrength_;
}
}
}
@ -2019,7 +2021,27 @@ std::unique_ptr<VkTexture> WMORenderer::generateNormalHeightMap(
double mean = sumH / totalPixels;
outVariance = static_cast<float>(sumH2 / totalPixels - mean * mean);
// Step 2: Sobel 3x3 → normal map (wrap-sampled for tiling textures)
// Step 1.5: Box blur the height map to reduce noise from diffuse textures
auto wrapSample = [&](const std::vector<float>& map, int x, int y) -> float {
x = ((x % (int)width) + (int)width) % (int)width;
y = ((y % (int)height) + (int)height) % (int)height;
return map[y * width + x];
};
std::vector<float> blurredHeight(totalPixels);
for (uint32_t y = 0; y < height; y++) {
for (uint32_t x = 0; x < width; x++) {
int ix = static_cast<int>(x), iy = static_cast<int>(y);
float sum = 0.0f;
for (int dy = -1; dy <= 1; dy++)
for (int dx = -1; dx <= 1; dx++)
sum += wrapSample(heightMap, ix + dx, iy + dy);
blurredHeight[y * width + x] = sum / 9.0f;
}
}
// Step 2: Sobel 3x3 → normal map
// Use ORIGINAL height for normals (crisp detail), blurred height for POM alpha only
const float strength = 2.0f;
std::vector<uint8_t> output(totalPixels * 4);
@ -2050,7 +2072,7 @@ std::unique_ptr<VkTexture> WMORenderer::generateNormalHeightMap(
output[idx + 0] = static_cast<uint8_t>(std::clamp((nx * 0.5f + 0.5f) * 255.0f, 0.0f, 255.0f));
output[idx + 1] = static_cast<uint8_t>(std::clamp((ny * 0.5f + 0.5f) * 255.0f, 0.0f, 255.0f));
output[idx + 2] = static_cast<uint8_t>(std::clamp((nz * 0.5f + 0.5f) * 255.0f, 0.0f, 255.0f));
output[idx + 3] = static_cast<uint8_t>(std::clamp(heightMap[y * width + x] * 255.0f, 0.0f, 255.0f));
output[idx + 3] = static_cast<uint8_t>(std::clamp(blurredHeight[y * width + x] * 255.0f, 0.0f, 255.0f));
}
}