Cycles: add Principled Volume shader.

Similar to the Principled BSDF, this should make it easier to set up volume
materials. Smoke and fire can be rendererd with just a single principled
volume node, the appropriate attributes will be used when available. The node
also works for simpler homogeneous volumes like water or mist.

Differential Revision: https://developer.blender.org/D3033

1 files changed, 19 insertions, 0 deletions

diff --git a/intern/cycles/render/nodes.h b/intern/cycles/render/nodes.h
index bc516af4511..33df2866341 100644
--- a/intern/cycles/render/nodes.h
+++ b/intern/cycles/render/nodes.h
@@ -561,6 +561,25 @@ public:
 	float anisotropy;
 };
 
+class PrincipledVolumeNode : public VolumeNode {
+public:
+	SHADER_NODE_CLASS(PrincipledVolumeNode)
+	void attributes(Shader *shader, AttributeRequestSet *attributes);
+	bool has_attribute_dependency() { return true; }
+
+	ustring density_attribute;
+	ustring color_attribute;
+	ustring temperature_attribute;
+
+	float anisotropy;
+	float3 absorption_color;
+	float emission_strength;
+	float3 emission_color;
+	float blackbody_intensity;
+	float3 blackbody_tint;
+	float temperature;
+};
+
 class HairBsdfNode : public BsdfNode {
 public:
 	SHADER_NODE_CLASS(HairBsdfNode)