source/blender/gpu/shaders/material/gpu_shader_material_hair.glsl

@@ -7,13 +7,24 @@ void node_bsdf_hair(vec4 color,
                     float weight,
                     out Closure result)
 {
+#if 0
+  /* NOTE(fclem): This is the way it should be. But we don't have proper implementation of the hair
+   * closure yet. For now fall back to a simpler diffuse surface so that we have at least a color
+   * feedback. */
   ClosureHair hair_data;
   hair_data.weight = weight;
   hair_data.color = color.rgb;
   hair_data.offset = offset;
   hair_data.roughness = vec2(roughness_u, roughness_v);
   hair_data.T = T;
-
+#else
+  ClosureDiffuse hair_data;
+  hair_data.weight = weight;
+  hair_data.color = color.rgb;
+  hair_data.N = g_data.N;
+  hair_data.sss_radius = vec3(0.0);
+  hair_data.sss_id = 0u;
+#endif
   result = closure_eval(hair_data);
 }
 
@@ -34,13 +45,22 @@ void node_bsdf_hair_principled(vec4 color,
                                out Closure result)
 {
   /* Placeholder closure.
-   * Some computation will have to happen here just like the Principled BSDF. */
+   * Some computation will have to happen here just like the Principled BSDF.
+   * For now fall back to a simpler diffuse surface so that we have at least a color feedback. */
+#if 0
   ClosureHair hair_data;
   hair_data.weight = weight;
   hair_data.color = color.rgb;
   hair_data.offset = offset;
   hair_data.roughness = vec2(0.0);
   hair_data.T = g_data.curve_B;
-
+#else
+  ClosureDiffuse hair_data;
+  hair_data.weight = weight;
+  hair_data.color = color.rgb;
+  hair_data.N = g_data.N;
+  hair_data.sss_radius = vec3(0.0);
+  hair_data.sss_id = 0u;
+#endif
   result = closure_eval(hair_data);
 }