Adding ScenePos.hx shader graph node.

hrt/shgraph/nodes/ScenePos.hx

@@ -0,0 +1,30 @@
+package hrt.shgraph.nodes;
+
+using hxsl.Ast;
+
+@name("Scene Pos")
+@description("Get scene position behind current pixel")
+@group("Property")
+class ScenePos extends ShaderNodeHxsl {
+
+	static var SRC = {
+		@sgoutput var output : Vec3;
+
+        @global var depthMap : Channel;
+
+		@global var camera : {
+			var zNear : Float;
+			var zFar : Float;
+			var inverseViewProj : Mat4;
+		};
+
+        var calculatedUV : Vec2;
+
+		function fragment() {
+			var depth = depthMap.get(calculatedUV);
+			var ruv = vec4(uvToScreen(calculatedUV), depth, 1);
+			var ppos = ruv * camera.inverseViewProj;
+			output = ppos.xyz / ppos.w;
+		}
+	};
+}