From 07dbff7dc1d5cfca9fbfb74204a2298e16d471b4 Mon Sep 17 00:00:00 2001 From: Brecht Van Lommel Date: Wed, 1 Nov 2017 17:12:36 +0100 Subject: Fix T53217: GLSL principled BSDF black with zero clearcoat roughness. --- source/blender/gpu/shaders/gpu_shader_material.glsl | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'source') diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl index 3dbecc58a7e..ce696706628 100644 --- a/source/blender/gpu/shaders/gpu_shader_material.glsl +++ b/source/blender/gpu/shaders/gpu_shader_material.glsl @@ -2524,7 +2524,11 @@ float schlick_fresnel(float u) float GTR1(float NdotH, float a) { - if (a >= 1.0) return M_1_PI; + if (a >= 1.0) { + return M_1_PI; + } + + a = max(a, 0.001); float a2 = a*a; float t = 1.0 + (a2 - 1.0) * NdotH*NdotH; return (a2 - 1.0) / (M_PI * log(a2) * t); -- cgit v1.2.3