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diff --git a/OptixDenoiserImpl.cc.orig b/OptixDenoiserImpl.cc
index e9b4302..57f2fba 100644
--- a/OptixDenoiserImpl.cc.orig
+++ b/OptixDenoiserImpl.cc
@@ -107,7 +107,7 @@ OptixDenoiserImpl::OptixDenoiserImpl(int width,
}
mDenoiserParams = {}; // zero initialize
- mDenoiserParams.denoiseAlpha = 0; // don't denoise alpha
+ mDenoiserParams.denoiseAlpha = OPTIX_DENOISER_ALPHA_MODE_COPY; // don't denoise alpha
mDenoiserParams.hdrIntensity = 0; // optional average log intensity image of input image,
// helps with very dark/bright images
mDenoiserParams.blendFactor = 0.f; // show the denoised image only
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