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, 56 insertions, 0 deletions

diff --git a/intern/cycles/kernel/shaders/node_hair_bsdf.osl b/intern/cycles/kernel/shaders/node_hair_bsdf.osl
new file mode 100644
index 00000000000..d1d7d0fb6a6
--- /dev/null
+++ b/intern/cycles/kernel/shaders/node_hair_bsdf.osl
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "stdosl.h"
+
+shader node_hair_bsdf(
+    color Color = 0.8,
+    string component = "Reflection",
+	float Offset = 0.0,
+	float RoughnessU = 0.1,
+	float RoughnessV = 1.0,
+	normal Normal = Ng,
+	output closure color BSDF = 0)
+{
+	float IsStrand;
+	float roughnessh = clamp(RoughnessU, 0.001,1.0);
+	float roughnessv = clamp(RoughnessV, 0.001,1.0);
+	getattribute("geom:is_curve", IsStrand);
+
+    if (!IsStrand) {
+		if (backfacing())
+        	BSDF = transparent();
+    	else {
+    		if (component == "Reflection")
+    			BSDF = Color * hair_reflection(Normal, roughnessh, roughnessv, normalize(dPdv), 0.0);
+    		else
+    			BSDF = Color * hair_transmission(Normal, roughnessh, roughnessv, normalize(dPdv), 0.0);
+		}
+	}
+    else {
+		if (backfacing())
+        	BSDF = transparent();
+    	else {
+    		if (component == "Reflection")
+    			BSDF = Color * hair_reflection(Normal, roughnessh, roughnessv, dPdu, -Offset);
+    		else
+    			BSDF = Color * hair_transmission(Normal, roughnessh, roughnessv, dPdu, -Offset);
+		}
+	}
+}
+