From aacad28954ceb792ecc7ebd90338466b9f70d456 Mon Sep 17 00:00:00 2001 From: yum Date: Tue, 24 Feb 2026 18:11:03 -0800 Subject: Implement wrapped lighting (direct & IBL diffuse) --- math.cginc | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'math.cginc') diff --git a/math.cginc b/math.cginc index 02d0fe0..3d7e92e 100755 --- a/math.cginc +++ b/math.cginc @@ -32,15 +32,16 @@ float sin_noise_3d_fbm(float3 uvw, uint octaves, float k, float strength) { return result; } -// Wrap a dot product. Assume it's already clamped. +// Wrap NoL. Assume it's already clamped. // At k=0, you get standard lambertian shading. // At k=0.5, you get half-lambertian shading. // At k=1.0, you get flat shading. // k must be on [0, 1]. // Energy preserving, within some small bound. -float wrapDotProduct(float XoY, float k) { - float lambertian = XoY; - float half_lambertian = pow(max(1e-4, (XoY + 0.5f) / (1.0f + 0.5f)), 2); +float wrapNoL(float NoL, float k) { + float lambertian = NoL; + float tmp = (NoL + 0.5f) / (1.0f + 0.5f); + float half_lambertian = tmp * tmp; float flat = RCP_PI; if (k < 0.5) { -- cgit v1.2.3