diff options
| -rw-r--r-- | source/blender/gpu/shaders/gpu_shader_material.glsl | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl index 67a099159c5..f14db57a26a 100644 --- a/source/blender/gpu/shaders/gpu_shader_material.glsl +++ b/source/blender/gpu/shaders/gpu_shader_material.glsl @@ -2636,14 +2636,11 @@ void node_bsdf_principled(vec4 base_color, float subsurface, vec3 subsurface_rad vec3 Tangent = T; if (T == vec3(0.0)) { // if no tangent is set, use a default tangent - Tangent = vec3(1.0, 0.0, 0.0); - if (N.x != 0.0 || N.y != 0.0) { - vec3 N_xz = normalize(vec3(N.x, 0.0, N.z)); - - vec3 axis = normalize(cross(vec3(0.0, 0.0, 1.0), N_xz)); - float angle = acos(dot(vec3(0.0, 0.0, 1.0), N_xz)); - - Tangent = normalize(rotate_vector(vec3(1.0, 0.0, 0.0), axis, angle)); + if(N.x != N.y || N.x != N.z) { + Tangent = vec3(N.z-N.y, N.x-N.z, N.y-N.x); // (1,1,1) x N + } + else { + Tangent = vec3(N.z-N.y, N.x+N.z, -N.y-N.x); // (-1,1,1) x N } } |