Cycles Hair: Two basic bair shaders added

A new hair bsdf node, with two closure options, is added. These closures allow the generation of the reflective and transmission components of hair. The node allows control of the highlight colour, roughness and angular shift.

Llimitations include:
-No glint or fresnel adjustments.
-The 'offset' is un-used when triangle primitives are used.

1 files changed, 40 insertions, 0 deletions

diff --git a/intern/cycles/render/nodes.cpp b/intern/cycles/render/nodes.cpp
index 30f51728e1b..70cb5613e61 100644
--- a/intern/cycles/render/nodes.cpp
+++ b/intern/cycles/render/nodes.cpp
@@ -1950,6 +1950,46 @@ void IsotropicVolumeNode::compile(OSLCompiler& compiler)
 	compiler.add(this, "node_isotropic_volume");
 }
 
+/* Hair BSDF Closure */
+
+static ShaderEnum hair_component_init()
+{
+	ShaderEnum enm;
+
+	enm.insert("Reflection", CLOSURE_BSDF_HAIR_REFLECTION_ID);
+	enm.insert("Transmission", CLOSURE_BSDF_HAIR_TRANSMISSION_ID);
+	
+
+	return enm;
+}
+
+ShaderEnum HairBsdfNode::component_enum = hair_component_init();
+
+HairBsdfNode::HairBsdfNode()
+{
+	component = ustring("Reflection");
+
+	add_input("Offset", SHADER_SOCKET_FLOAT);
+	add_input("RoughnessU", SHADER_SOCKET_FLOAT);
+	add_input("RoughnessV", SHADER_SOCKET_FLOAT);
+
+}
+
+void HairBsdfNode::compile(SVMCompiler& compiler)
+{
+	closure = (ClosureType)component_enum[component];
+
+	BsdfNode::compile(compiler, input("RoughnessU"), input("RoughnessV"), input("Offset"));
+}
+
+void HairBsdfNode::compile(OSLCompiler& compiler)
+{
+	compiler.parameter("component", component);
+
+	compiler.add(this, "node_hair_bsdf");
+
+}
+
 /* Geometry */
 
 GeometryNode::GeometryNode()