- Node appears in shader editor
- Material renders in EEVEE

TODO: Work on Cycles

@@ -470,0 +478,4 @@
+          sd, sizeof(MicrofacetBsdf), rgb_to_spectrum(make_float3(mix_weight)));
+
+      if (!(bsdf == NULL)) {
+        uint base_ior_offest, edge_tint_k_offset, rotation_offset, tangent_offset;

@@ -0,0 +4,4 @@
+
+vec4 fresnel_conductor(float cosi, const vec3 eta, const vec3 k)
+{
+  const vec4 cosiv4 = vec4(cosi);

@@ -4045,6 +4045,29 @@ static const EnumPropertyItem node_ycc_items[] = {
     {0, nullptr, 0, nullptr, nullptr},
 };
 
+static const EnumPropertyItem node_conductor_distrobution_items[] = {

@@ -4048,0 +4048,4 @@
+static const EnumPropertyItem node_conductor_distrobution_items[] = {
+    {SHD_GLOSSY_BECKMANN, "BECKMANN", 0, "Beckmann", ""},
+    {SHD_GLOSSY_GGX, "GGX", 0, "GGX", ""},
+    {SHD_GLOSSY_MULTI_GGX,

@@ -4048,0 +4058,4 @@
+};
+
+static const EnumPropertyItem node_conductor_fresnel_type_items[] = {
+    {SHD_CONDUCTOR, "CONDUCTOR", 0, "Conductor Fresnel", ""},

@@ -61,6 +61,7 @@ DefNode(ShaderNode,     SH_NODE_ATTRIBUTE,          def_sh_attribute,       "ATT
 DefNode(ShaderNode,     SH_NODE_AMBIENT_OCCLUSION,  def_sh_ambient_occlusion,"AMBIENT_OCCLUSION", AmbientOcclusion, "Ambient Occlusion", "Compute how much the hemisphere above the shading point is occluded, for example to add weathering effects to corners.\nNote: For Cycles, this may slow down renders significantly")
 DefNode(ShaderNode,     SH_NODE_BACKGROUND,         0,                      "BACKGROUND",         Background,       "Background",        "Add background light emission.\nNote: This node should only be used for the world surface output")
 DefNode(ShaderNode,     SH_NODE_HOLDOUT,            0,                      "HOLDOUT",            Holdout,          "Holdout",           "Create a \"hole\" in the image with zero alpha transparency, which is useful for compositing.\nNote: the holdout shader can only create alpha when transparency is enabled in the film settings")
+DefNode(ShaderNode,     SH_NODE_BSDF_CONDUCTOR,        def_conductor,             "BSDF_CONDUCTOR",        BsdfConductor,  "Conductor BSDF",       "Reflection with microfacet distribution, used for materials such as metal or mirrors")

@@ -0,0 +17,4 @@
+      .default_value({0.183f, 0.421f, 1.373f})
+      .min(0.0f)
+      .max(100.0f)
+      .description("PLACEHOLDER");

@@ -0,0 +84,4 @@
+{
+  const int fresnel_method = node->custom2;
+
+  bke::nodeSetSocketAvailability(

@@ -4048,0 +4064,4 @@
+     0,
+     "Artistic Conductor",
+     "Conductor Fresnel with artist friendly color inputs"},
+    {SHD_CONDUCTOR_F82, "F82", 0, "F82 Approximation", ""},

@@ -0,0 +109,4 @@
+
+  /* TODO: Figure out how to switch between artisitic_ior and using
+   * the IOR and Extinction values directly.
+   * `node` is not defined here so we can't use `node->custom2` */

@@ -105,1 +105,4 @@
 
+ccl_device float3 conductor_ior_from_color(float3 r, const float3 edge_tint)
+{
+  r = clamp(r, zero_float3(), make_float3(0.99));

@@ -0,0 +11,4 @@
+
+static void node_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Color>("Base Color").default_value({1.0f, 1.0f, 1.0f, 1.0f});

@@ -106,0 +133,4 @@
+                                           ccl_private float3 *eta,
+                                           ccl_private float3 *k)
+{
+  /* Equations from "Artist Friendly Metallic Fresnel", Ole Gulbrandsen, 2014

@@ -482,0 +516,4 @@
+        bsdf->alpha_y = alpha_y;
+
+        ClosureType distribution = (ClosureType)node.w;
+        /* setup bsdf */

@@ -349,1 +349,4 @@
 
+ccl_device_inline float3 mix(const float3 a, const float3 b, float3 t)
+{
+  return make_float3(mix(a.x, b.x, t.x), mix(a.y, b.y, t.y), mix(a.z, b.z, t.z));

@@ -4091,0 +4105,4 @@
+     "PHYSICAL_CONDUCTOR",
+     0,
+     "Physical Conductor",
+     "Physically accurate Fresnel effect based on the complex IOR of the material"},

@@ -4091,0 +4110,4 @@
+     "ARTISTIC_CONDUCTOR",
+     0,
+     "Artistic Conductor",
+     "Conductor Fresnel with artist friendly color inputs"},

@@ -4091,0 +4115,4 @@
+     "F82",
+     0,
+     "F82 Tint",
+     "An approximation of the Conductor Fresnel curve based on the perpendicular color and the "

@@ -0,0 +11,4 @@
+
+static void node_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Color>("Base Color").default_value({0.8f, 0.8f, 0.8f, 1.0f});

@@ -0,0 +12,4 @@
+static void node_declare(NodeDeclarationBuilder &b)
+{
+  b.add_input<decl::Color>("Base Color").default_value({0.8f, 0.8f, 0.8f, 1.0f});
+  b.add_input<decl::Color>("Edge Tint").default_value({1.0f, 1.0f, 1.0f, 1.0f});

@@ -0,0 +17,4 @@
+      .default_value({2.741f, 2.542f, 2.267f})
+      .min(0.0f)
+      .max(100.0f)
+      .description("Real part of the conductor's IOR");

@@ -0,0 +22,4 @@
+      .default_value({3.814f, 3.434f, 3.038f})
+      .min(0.0f)
+      .max(100.0f)
+      .description("Complex part of the conductor's IOR");

@@ -0,0 +28,4 @@
+      .min(0.0f)
+      .max(100.0f)
+      .description("Imaginary part of the conductor's refractive index, often called k");
+  b.add_input<decl::Float>("Roughness")

@@ -0,0 +4,4 @@
+
+vec3 fresnel_conductor(float cosi, const vec3 eta, const vec3 k)
+{
+  const vec3 cosiv3 = vec3(cosi);

@@ -0,0 +11,4 @@
+  const vec3 tmp_f = (eta * eta) + (k * k);
+
+  const vec3 tmp = tmp_f * cosi_sqr;
+  const vec3 Rparl2 = (tmp - (2.0 * eta * cosiv3) + one) / (tmp + (2.0 * eta * cosiv3) + one);

@@ -482,0 +488,4 @@
+      ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
+          sd, sizeof(MicrofacetBsdf), rgb_to_spectrum(make_float3(mix_weight)));
+
+      if (!(bsdf == NULL)) {

@@ -2444,0 +2445,4 @@
+
+NODE_DEFINE(MetallicBsdfNode)
+{
+  NodeType *type = NodeType::add("Metallic_bsdf", create, NodeType::SHADER);